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HomeMy WebLinkAbout2022-01-04 Stormwater Management Report 2 WSP 12129121,8:46 AM Town of North Andover Mail-RE:212 Brentwood Circle, NA-Map for location of 5tormwater practices NORT-K AODVER Massachusetts Jean Enright<jenright@north andoverma.gov> RE: 212 Brentwood Circle, NA - Map for location of Stormwater practices 1 message Jack Sullivan <jacksull53@comcast.net> Mon, Dec 27, 2021 at 7:46 PM To: Jean Enright<je nri ght@northan dove rma.gov> Cc: Jonas Procton <jprocton@horsleywitten.com>, Janet Bernardo <jernardo@horsleywitten.com> Jean, Jonas, and Janet...I took one more look thru the 12/16/2021 2nd review letter and HW recommended a plan or map indicating the location of the stormwater practices,...in my O&M plan I call out site vegetation and the river rock off the pool patio and shed to be maintained as an ongoing maintenance requirement (I also increased the inspection of the river rock trenches to twice annually)...the river rock trenches are clearly shown on the Site Plan and 1 would ask that the Site Plan serve as the general map in this case. Thank you. Sullivan Engineering Group, LLC Jack Sullivan P.O. Box 2004 Woburn, MA 01888 781-854-8644 On 12/27/2021 4:03 PM Jack Sullivan <jacksu1153@comcast,net>wrote: Hi Jean, I know you are off today but wanted to send this electronically and will drop off paper copies of each tomorrow. I have updated the Site Plan, drainage report and O&M plan fully per the HW Group letter dated 12/16/2021. All requested changes and/or additional info. has been provided. If anyone has any questions or comments please let me know. Thank you. Sullivan Engineering Group, LLC Jack Sullivan P.O. Box 2004 Woburn, MA 01888 781-854-8644 On 12/16/2021 5:34 PM Janet Bernardo<jernardo@horsleywitten.com>wrote: Good evening, Please find attached the 2"d peer review for the proposed development at 212 Brentwood Circle. Thank you, Janet https:/Imal l.google.com/inali/u/01?i k=7c2off6265&view=pt&search=all&p erm th id=thread-f%3A1720348720963472647&sitnpl=msg-f%3Al7203487209... 1/2 12/29121,8:46 AM Town of North Andover Mail-RE:212 Brentwood Circle,NA-Map for location of Stormwater practices Janet Carter Bernardo, P.E. Horsley Witten Group Office: 857-263-8193 From: Jean Enright<jenright cr northandoverma.gov> Sent: Wednesday, December 8, 2021 9:09 AM To: Janet Bernardo <jernardo@horsleywitten,com> Cc:jacksu1153@comcast.net Subject: 212 Brentwood Circle Hi Janet, I have attached the applicant's response letter, updated site plan and signed O&M Plan for your review and comments. The next Planning Board meeting is December 21. Upon receipt of your comments I intend to prepare a decision for the Board's consideration at this meeting. Thank you in advance. Sincerely, Jean Enright Planning Director Town of North Andover 120 gain Street North Andover, MA 01845 Phone 978.688.9533 Fax 978.688.9542 Email: jenright c@r northandoverma,gov Web: www,Noi,thAtidoverMA.gov All email messages and attached content sent from and to this email account are public records unless qualified as an exemption under the Massachusetts Public Records Law. Visit us online at www,northancloverma,gov. https://mai l.google.com/mai llu/0/?ik=7c2eff6265&view=pt&sea rch=all&permthid=thread-f%3A1720348720963472647&slmpl=msg-f°/a3A17203487209... 212 Sullivan Engineering Group, LLC Civil Engineeis& Land Development Consultants December 27, 2021 Town of North Andover Planning Dept. 120 North Main Street North Andover, MA 01845 Re: 212 Brentwood Circle, North Andover Watershed Special Permit-- Pool/patio/shed Planning Dept; This letter is intended to address/answer comments from the peer review by the Horsley Witten (HW) Group in a letter prepared by their office dated December 16, 2021 (second review letter). The review letter focused on the stormwater management report and Site Plan in compliance with the Massachusetts Storniwater Handbook. Responses below are to outstanding issues raised in the Dec. 16, 2021 letter. Standard 2: Stormwater management systems shall he designed so that post development peak discharge rates do not exceed pre development peak discharge rates. The full site was evaluated for the predevelopment vs. postdevelopment scenario. Watershed maps were created and there are two distinct subwatersheds with two discharge points. The two sub-watershed areas are shown on both the attached Predevelopment and Postdevelopment drainage plans. The subcatchments are mapped, time of concentration shown, and land uses within each subcatchnlent shown. HydroCAD calculations were performed for the 1/2", 2, 10, 25, and 100 year storm event and the rainfall amounts used were based on the NRCC Atlas of Precipation Extremes for the Northeastern United States. Predevelopment watershed 2S was broken out into the three subwatersheds to reflect total land use area draining to each stormwater control point. The following are the results for each sub-watershed area. Design Point 1 Predevelopment(cfs) Volume (cf) Postdevelopment(cfs) Volume (cf) Storm Event 1/2" Storm 0 0 0 0 2 Year 0.29 974 0.29 974 10 Year 0.75 2,311 0.75 2,311 25 Year 1.14 3,483 1.14 3,483 100 Year 2.07 6,303 2.07 6,303 PO Box 2004 Woburn, MA 01888 (781) 854-8644 e-mail:jacksul153@comcast.net There was no proposed change in the site development within this subcatchrnent area, Design Point 2 Predevelopment(cfs) Volume (cf) Postdevelopment(cfs) Volume (cf) Storm Event '/2"rain event 0.00 0 0.00 0 2 Year 0.20 947 0.04 246 10 Year 0.66 2259 0.22 831 25 Year 1.07 3555 0.41 1521 100 Year 2.08 6776 1.98 4433 Standard 3: The drawdown calculation for the pool/patio river rock area is as follows, Peak water elevation: 104.20' Bottom of trench: 99.20' Difference is 60",..,.using 1.02 in/hr for recharge rate (conservative)...the total drawdown time is 58,8 hours < 72 hrs (meets standard) The drawdown calculation for the shed area river rock area is as follows; Peak water elevation: 103.00 Bottom of trench: 99.00 Difference is 48",,...using 1.02 in/hi for recharge rate (conservative)...the total drawdown time is 47 hours < 72 hrs (meets standard) A factor of 2x was used in the soil infiltration rate in the HydroCAD analysis (i.e field pert test was 12 MPI and a design perc rate of 24 MPI was used). Additionally the field percolation data was added to the Site Plan to show depth of perc, 15 minute presoak, and time from 12 inch to 9 inch field test. Misc. items: - The erosion control barrier detail has been revised to show the wood posts on the side of the barrier opposite the water flow - Limit of disturbance line has been revised to encompass all proposed work areas. - A tree protection detail has been added to the plan and a note in the area of the proposed shed that tree protection shall be provided in any work is close to a mature tree - 1/2"rain event added to each HydroCAD analysis PO Box 2004 Wobum,MA 01888 (781) 854-8644 e-mail:jacksu1153@comcast.net Very Truly Yours, . John ck)D Sullivan III, PE Attachments: - NRCS soil map/description - Predevelopment Drainage Plan w/subcatchments shown - Predevelopment HydroCAD analysis - Postdevelopment Drainage Plan w/subcatchments shown - Postdevelopment HydroCAD analysis Cc: John Teinullo, Owner PO Box 2004 Woburn.,MA 01888 (781) 854-8644 e-mail:jacksu1153@comcast.net a lam'' ar " MIAMI "" Tt ,4 Alp Or X E 4 Nii 4.1- j i � ✓ .* V. w ill [ € zz F>wA—Q not - t� .!r .w..• ; W Y MIT wo vp `, wz r rX# I *^ 6 01 OAR Wyk- TI aq�ula� �a�9�� fDC�d�➢Bch V M@oozy :ICI Hit t«I ! '! r„/ Y Id"! ,.![ ! Iv,d •1 r.;•y 1 •1 i1 1 1 1 1 11 :11 •./ / - 0 lies- - . ..- 0 Soil Map—Essex County, Massachusetts,Northern Part MAP LEGEND MAP INFORMATION Area of Interest(A01) Spot]Area The soil surveys that comprise your AO were mapped at Area of Interest(AOI) u Stony Spot 1:15,800. Soils C�,, Very Stony Spot Warning:Soil Map may not be valid at this scale. Soil Map Unit Polygons Wet Spot Enlargement of maps beyond the scale of mapping can cause Soil Map Unit Lines misunderstanding of the detail of mapping and accuracy of soil Other line placement.The maps do not show the small areas of Soil Map Unit Paints Special Line Features contrasting soils that could have been shown at a more detailed r Special Point Features scale. U Blowout Water Features Streams and Canals Please rely on the bar scale on each map sheet for map Borrow Pit measurements. Transportation Clay Spot Pails Source of Map: Natural Resources Conservation Service { Closed Depression Web Soil Survey URL: s Interstate Highways Coordinate System: Web Mercator(EPSG:3857) Gravel Pit US Routes Maps from the Web Soil Survey are based on the Web Mercator Gravelly Spot Major Roads projection,which preserves direction and shape but distorts distance and area.A projection that preserves area,such as the Landfill Loral Roads Albers equal-area conic projection,should be used if more rl Lava Flow Backgroundaccurate calculations of distance or area are required. Marsh or swamp Aerial Photography This product is generated from the USDA-NRCS certified data as of the version date(s)listed below. Mine or Quarry Soil Survey Area: Essex County,Massachusetts,Northern Part Miscellaneous water Survey Area Data: Version 17,Sep 2,2021 Perennial Water Soil map units are labeled(as space allows)for map scales Rock Outcrop 1:50,000 or larger. Jr Saline Spot Date(s)aerial images were photographed: Aug 13,2020—Oct 18,2020 ° Sandy Spot The orthophoto or other base map on which the soil lines were Severely Eroded Spot compiled and digitized probably differs from the background Sinkhole imagery displayed on these maps.As a result,some minor shifting of map unit boundaries may be evident. Slide or Slip Sodic Spot USDA Natural Resources Web Soil Survey 11/30/2021 21 Conservation Service National Cooperative Soil Survey Page 2 of 3 Soil Map—Essex County,Massachusetts,Northern Part Map Unit Legend Map Unit Symbol Map Unit Name Acres in AOI :Percent of AOI 52A Freetown muck,0 to 1 percent 1.0 2.2% slopes 73A _..__ Whitman fine Sandy loam,0 to 0.5 1.0% 3 percent slopes,extremely stony 405C Charlton fine sandy loam,8 to 0.3 0.7% 15 percent slopes 406E _ Charlton fine sandy loam,3 to 6.2 14�0% 8 percent slopes,very stony 406C Charlton fine sandy loam,8 to 0.9 2.0% 15 percent slopes,very stony 406D Charlton fine sandy loam, 15 to 0.3 0.7% 25 percent slopes,very stony 410E Sutton fine sandy loam,3 to 8 5.5 12.2% percent slopes 411E Sutton fine sandy loam,0 to 8 26.3 ._...._. 58.9% percent slopes,very stony 715E Ridgebury and Leicester fine 3.7 8.3% sandy learns,3 to 8 percent slopes,extremely stony Totals for Area of Interest 44.6 100.0% USDA Natural Resources Web Soil Survey 11/30/2021 �� Conservation Service National Cooperative Soil Survey Page 3 of 3 Edge of Poy meat N25'05'53"w 1 f02� JL150.00' I DESIGN POINT#1 Reber w/ 38' 1, I �\ Cop Fad \ ti\ / '--96 104— 6-0 I1 106— —--— 90.2' \\ J SEMR I \ ioa —/ MOO , o. a SEW R YICE / - -fNSTALiE9 ON \ 6--21104995'- I \ // 104x7 \I_ GS BH. Cone. SI 100 2 / t�rivewgy�_ 105k1 I \\ 3 0 \ fix, Walkway . / 10S 4 \ / 106x7 1 Z / � �FFE=107.7' � i tosxs -A / Ex. 2 Story o m J 2 Car Structure o 90 { •` vpo C � / x lOSxSW 2- I'1 \ a a 166x 167x2 , Y� \e I Z a Ln o N \ 1, 45x0 / Ex Patio N o r ,W O IOSk8 W� O� co 4 , i050 / a ¢'p O% 106A G gj r" 0 0 105— o 0 1 �• lasxz - P 1r ` 1 j M12 C � — — to7xs —— — �/ 1osh t03,e 16318 10-W / 104x2 \ / TH-1 �• t03ke ` �--1113 ry ,� Ex. Trealine /1a2x9 1 Rtx2 t03x2 103x8 J ----__—......---_—.. .----// DESIGN POINT#2 LOT AREA .44,000 S.F.f PREDEVELOPMENT TAX MAP�4 DRA-LINAGE PLAN N/F88AR RA dR CIRCLE S16 57 52,F ES TAX MAP N�� BHEN LOT 58 64 ACOQ &LOROD Cj1,R RE SCALE.'1"=20' FEET 20 0 10 20 40 1S 2S 1L Design Point 1 2L Design Point 2 Subcaf Reach on �jnk Drainage Diagram for 212 Brentwood Circle_Predevelopment Prepared by Sullivan Engineering Group, LLC 1 2/2 712 02 1 ilydroCAD®7.00 sin 001433 ©1986-2003 Applied Microcomputer Systems 212 Brentwood Circle_Predevelopment Type 11124-hr 2 yr Rainfall=3.20" Prepared by Sullivan Engineering Group, LLC Page 2 HydmCADO 7.00 sln 001433 O 1986-2003 Applied Microcomputer Systems 12/27/2021 Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points Runoff by SCS TR-20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment IS: Runoff Area=16,668 sf Runoff Depth=0.70" Flow Length=175' Tc=7.2 min CN=69 Runoff=0,29 cfs 974 cf Subcatchment 2S: Runoff Area=20,558 sf Runoff Depth=0.49" Flow Length=142' Tc=9.1 min CN=64 Runoff=0.20 cfs 847 cf Link 1 L: Design Point 1 Inflow=0.29 cfs 974 cf Primary=0.29 cfs 974 cf Link 2L: Design Point 2 Inflow=0.20 cfs 847 of Primary-0.20 cfs 847 of Total Runoff Area = 37,226 sf Runoff Volume = 1,821 of Average Runoff Depth = 0.59" 212 Brentwood Circle_Predevelopment Type 1/124-hr 2 yr Rarnfall=3.20" Prepared by Sullivan Engineering Group, LLC Page 3 HydroCADO 7.00 s/n 001433 OO 1986-2003 Applied Microcomputer Systems 12/27/2021 Subcatchment 1S: Runoff - 0.29 cfs @ 12.12 hrs, Volume= 974 cf, Depth= 0.70" Runoff by SCS TR-20 method, UH=SCS, Time Span 5.00-20.00 hrs, dt= 0.05 hrs Type 111 24-hr 2 yr Rainfall-3.20" Area (sf) CN Description 1,128 98 Portion of Roof House 395 98 Walkway 1,918 98 paved driveway 13,227 61 >75% Grass cover, Good HSG B 16,668 69 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ftlft)_ (ftlsec) (cfs) 6.4 41 0.0100 0.1 Sheet Flow, Grass: Short n= 0.150 P2- 3.10" 0.2 72 0.0600 5.0 Shallow Concentrated Flow, Paved Kv= 20.3 fps 0.6 62 0.0600 1.7 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 7.2 175 Total Subcatchment 1S: Hydrograph ____1---- ____ ____1____ ____I____1___- n r I I I i E 1 I I I € 1 I I € Iy /I I I F 1 I I € �f7ult61f r----1----r--- U.29 cfs 0.28 -- ; ------- -Type111.24�=hr 2-yr... l �� ---- -- ----, ROinfall= 3120--- L___J_ 0.22 _ �� Runoff Area=16 658 �sf- ----------r r----I-- r----,- r _ 1-T- --3-._....... . -- ---runoff;Vo umie= 74-:'cf- - - - - o Q.16 f. ----�---y----�---�----r---�--- .,.--,----�.unoff-�]epth"0.70--- LL 0.14 ---- -._ i.. _.--i -- } - -- --I----L-�-I I {}.12= I 1 ow-Len,gthl='I-75'r ---- - ----r----€- -...r._ .._. Q.1 =r/w/� i �!JI� ,1IL ll n l_ r I I 1 1 I I o ', I 3 I I I I .QB I I I I I I I 1 I I I 1 I { I I 1 I 3 I I E I 1 0.047 0 l 1. �a¢' 5 fl 7 8 9 to 11 12 13 14 15 18 17 18 19 20 Vine (hours) 212 Brentwood Circle_Predevelopment Type 11124-hr 2 yr Rainfall=3,20" Prepared by Sullivan Engineering Group, LLC Page 4 H droCADO 7.00 sln 001433 ©1986-2003 Applied Microcomputer Systems 12/27/2021 Subcatchment 2S: Runoff = 0,20 cfs @ 12.16 hrs, Volume= 847 cf, Depth= 0.49" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type Ili 24-hr 2 yr Rainfall=3.20" Area sf CN Description 1,186 98 Portion of House Roof 1,524 98 Ex. Patio 11,092 61 >75% Grass cover, Good, HSG B 6,756 55 Woods Good HSG B 20,558 64 Weighted Average Tc Length Slope Velocity Capacity Description min feet ftlft) (ftlsec) (cfs 7.5 50 0.0100 0.1 Sheet Flow, Grass: Short n= 0.150 P2= 3,10" 0.4 18 0.0100 0.7 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 0.2 30 0.1000 2.2 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 1.0 44 0.0100 0.7 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 9.1 142 Total Subcatchment 2S: Hydrograph I I E I I i I I I I I I I k I I E I 1 0.22: . --- , ---�---- -- {- -- -,-. uno r I I I I I V I I E 1 0.21 , ----r——— ----r——— ---—r--- -1----r---— ---r ——————h—— —-1— —' • • I I I € ! I k I I I 0.2: ---__._:............ .......... ............... --' .... - . '----1----;-T-ype 1-24- ' r 2-,y-r-- 0.19 r ----�---J----�--- ----�----'--- ----L----'---- ----'----1----1---- 0.18 ----;---,----; --- ,---- ---;--- -- 1----;----,--Roinfall=3 20, ' - 0.17 ------------------------------ ---------------------------------- • I I I I f E I I I 1 S I I 0.161 Runoff Area=20,558-:0- 0.153 . ----r---1----r---1----r---�--- --�----r----r---r----f----+---—I--- 0.14 _I... L-- -I--- I'- 0.11- �- . -�...---1—.._.._ ..._ . ...€.-.. . un..o e. M 0.1: r, ____I _]]''��TEf____3__ I__ !!/'J� ow- I 1 I ! gt 0.08- - ---- 7--- . .,.._..... ,. ,. ,. , --- -- -7----r----I-- — I - ----I,--- 0.07- ----E ---;----;----;----;----,-- -;----;--------;16F --mlin-- J————L————I————L. .. L———_I———— . r I 1 I I I } � I I I I 0.05. , ----r---1----r--- ----�--- -- ---+--------+-------C-N=64 - 0.04: 1. ----'----' ----------------- - Q.m- - ———— .,..._J____L___J____L__,_J__ 0.021 .. a 0.00- : 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 212 Brentwood Circle_Predevelopment Type 11124-hr 2 yr Rainfal1=3.20" Prepared by Sullivan Engineering Group, LLC Page 5 H droCAD®7.00 sln 001433 OO 1986-2003 Applied Microcomputer Systems 12/27/2021 Link 1 L: Design Point 1 Inflow Area = 16,668 sf, Inflow Depth = 0.70" for 2 yr event Inflow = 0.29 cfs @ 12.12 hrs, Volume= 974 cf Primary — 0.29 cfs @ 12.12 hrs, Volume= 974 cf, Men= 0%, Lag= 0.0 min Primary outflow= Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Link 1 L: Design Point 1 Hydrograph I I € im inflow I,': I I t I 2 t I E I I I € Primary fl -- 0. 9 cfs --- - - - °'3' " ___ t____I_ __ nfow4rea 0.28 I ! I 0.26. 0.24 I I r i 0.22- I I I 0.2 I I E I I I I I I E I _--E----r---{---- -------- 0.16: 1 1 1 1 p �= _---1----1----L---J___-I..-_._L. .--E---"-a---- ----1----1--- ----t......... u. 0.14-. • I I I I ! 1 I I I ! 1 I I 3 I I I I 1 I I € 1 1 0.12- 1 I --- E I I I 1 E 1 I 1 I I E E I I L r E 3 1 I I 1 i i I I 0.04- 0.02: N 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 212 Brentwood Circle_Predevelopment Type 11124-hr 2 yr Rainfall=3.20" Prepared by Sullivan Engineering Group, LLC Page 6 H droCAD®7.00 sln 001433 O 1986-2003 Applied Microcomputer Systems 12/27/2021 Link 2L- Design Point 2 Inflow Area = 20,558 sf, Inflow Depth = 0.49" for 2 yr event Inflow 0.20 cfs @ 12.16 hrs, Volume= 847 cf Primary = 0.20 cfs @ 12.16 hrs, Volume= 847 cf, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Link 2L; Design Point 2 Hydrograph I I I I I ,• I I i I I 7 I I I I Fig iniiOw 0.22 I 1 i i I I 1 I I I -1- - 1113 Primary ---------------------- 0.20 cfs 0.21 :'; --- -.. ...---- .. .._ ................. :.. -- nfIQW�Area= U,558- - 1 , .... I I I I I I 3 I 3 I I I I i I 1 3 I 1 i I t I I I I • % I I I I 1 I f I 3 I I I I V.1'3-' • ____L___J____I____S • i % , I I I 3 I I GA11 I 7 I I I I l % I I i 1 f I i I 1 LL 0,1: '-' ---- -,-`. ..._.,..,.........1...............1 ...._...,...i._...,..__..1- --j----+----3----1----+--- ----~--- ,' I 3 1 I 3 I t I I I I , 0,07. r--- -I--- i--__,_- 0.04 U,03` ---I--------I--- -I----'----I -'--- I 0.02 (MM, 0' 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 212 Brentwood Circle_Prederrelopment Type 11124-hr 10 yr Rainfall=4.80" Prepared by Sullivan Engineering Group, LLC Page 7 H droCAD®7.00 sin 001433 O 1986-2003 Applied Microcomputer Systems 12/27/2021 Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points Runoff by SCS TR-20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 1S: Runoff Area=16,668 sf Runoff Depth=1.66" Flow Length=175' Tc=7.2 min CN=69 Runoff=0.75 cfs 2,311 cf Subcatchment 2S: Runoff Area=20,558 sf Runoff Depth=1.32" Flow Length=142' Tc=9.1 min CN=64 Runoff=0.66 cfs 2,259 cf Link 1 L: Design Point 1 Inflow=0.75 cfs 2,311 cf Primary=0.75 cfs 2,311 cf Link 2L: Design Point 2 Inflow=0.66 cfs 2,259 cf Primary=0.66 cfs 2,259 cf Total Runoff Area = 37,226 sf Runoff Volume 4,570 cf Average Runoff Depth = 1.47" 212 Brentwood Circle_Predevelopment Type I// 24-hr 10 yr Rainfall=4.80" Prepared by Sullivan Engineering Group, LLC Page 8 HydroCAD®7.00 sln 001433 GO 1986-2003 Applied Microcomputer Systems 12/27/2021 Subcatchment 'IS: Runoff = 0.75 cfs @ 12.11 hrs, Volume= 2,311 cf, Depths 1.66" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 10 yr Rainfall=4.80" Area (sf) CN Description 1,128 98 Portion of Roof House 395 98 Walkway 1,918 98 paved driveway 13,227 61 >75% Grass cover, Good HSG B 16,668 69 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) --(cfs) 6.4 41 0.0100 0.1 Sheet Flow, Grass: Short n= 0.150 P2= 3.10" 0.2 72 0.0600 5.0 Shallow Concentrated Flow, Paved Kv= 20.3 fps 0.6 62 0.0600 1.7 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps _ 7.2 175 Total Subcatchment 1S: Hydrograph I € € € € I I 3 € € € 3----I----E----3----€ --. . ----�- €r: ----I----j----I----j----�. , ----r---7----r- - 6.75cfs - -- -- ; -- --- Type,lll -2,4.,h�-10-;yr 0.7� I t -------- -----``....€.... ....-�. ------- ---_____i I € 0.651 € aMn a '�" - 0.6 -. ---- --- ---- --- ----I-- - -. Rau-no€ff A,eea! 'l 6,'668:sf- I € € € I € I I I € u6off,Vo1uM =2,311;of- 0.5: Runoff-DE th=1.66., 0.4: -------- .. . . .... - ---'-- _. FIOW-L-eingth=175-- 0.35'' I € € I I € E I I I 0.3= , Tc-7 2 in 0.05 0- 5 6 7 t3 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 212 Brentwood Circle_Predevelopment Type /// 24-hr 90 yr Rainfa11=4.80" Prepared by Sullivan Engineering Group, LLC Page 9 ydroCAD®7.00 sln 001433 01986-2003 Applied Microcomputer Systems 12/27/2021_ Subcatchment 2S: Runoff - 0.66 cfs @ 12.14 hrs, Volume= 2,259 cf, Depth= 1.32" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 10 yr Rainfall=4,80" Area sf CN Description 1,186 98 Portion of House Roof 1,624 98 Ex. Patio 11,092 61 >75% Grass cover, Good, HSG B 6,756 55 Woods Good HSG B 20,558 64 Weighted Average Tc Length Slope Velocity Capacity Description min feet ftlft ftlsec cfs 7.5 50 0.0100 0.1 Sheet Flow, Grass: Short n= 0.150 P2= 3.10" 0.4 18 0.0100 0.7 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 0.2 30 0.1000 2.2 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 1.0 44 0.0100 0.7 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 9.1 142 Total Subcatchment 2S: Hydrograph I i I I I I I I 1 I 1 I I I I 3 I I I I = - ----L._...,....y__--r----I----r--- ----r---7-- ,._,.........,--I----t----I----+----I---- RUhoff 0.66 cfs E I I I 3 0.65� _--_,__Type L 1111 2,4-hr-10;yr-. -- ---- _ .. 0.6- ,: --- --- ---;--- ---;--- .. - ,---------I----Rainfalir4:80".. 0.55-" - ----;----;----;----;----;-- Runoff Ai ea::*0 §5.8!-SU 0.5- y l 0.45- ;Runoff;VO]"UMP= R59;cf (-.,.----I----i---�----i----I-- ---I--_..,._.,....----E--__ ----I----T 3 u 0.4� --- --- ---- ---�---- - -- ----LRunof Depthl-1 .. 2." 0.35; ' /y I I I I I E I I I I �r o'��■■ Jr-ehgth'142i- I I I f I I I ! 1 7 I I I 0.3, I -- ---- - --E----;----,----,--Tc91- >In 0.25= _L_ _3__ _1 _ €_ E k 1 I I I I 1 I 3 I 0.2- 0.15' I I I 3 I E I I I I I f E I �l---- - 0.1� r 0.05- I ;r 0^ 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Thne (hours) 212 Brentwood Circle_Predevelopment Type i1124-hr 10 yr Rainfall=4.80" Prepared by Sullivan Engineering Group, LLC Page 10 HydroCADO 7.00 sln 001433 © 1986-2003 Applied Microcomputer Systems 12/27/2021_ Link 1 L: Design Point 1 Inflow Area = 16,668 sf, Inflow Depth = 1.66" for 10 yr event Inflow = 0.75 cfs @ 12.11 hrs, Volume= 2,311 cf Primary = 0,75 cfs @ 12.11 hrs, Volume= 2,311 cf, Atten= 0%, Lague 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Link 1L: Design Point 1 Hydrograph I I 13 Inflow r ----rI --------13I--------rII -------II--------I3-- ----rI --- 1 ------Ir'------- IPrimary 0.75 cfs Ar6,,,a_ 65-668-sf- 0.75. 0.7 0.6 0,55: 0.45 r I i I i I I E 1 I I I 0.4- r' _--_T----i--__-- -_--_I__ 0,35 F I 0.25: 1 I I I I I I I I I I E I I 0.2- I i I 3 E I I I E I r 0.15: I I I I I I E E I I 0' 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 212 Brentwood Circie_Predevelopment Type 11124-hr 10 yr Rainfal1=4.80" Prepared by Sullivan Engineering Group, LLC Page 11 H droCADO 7.00 sln 001433 01986-2003 Applied Microcomputer Systems 12/2712021 Link 2L: Design Point 2 Inflow Area = 20,558 sf, Inflow Depth = 1.32" for 10 yr event Inflow = 0.66 cfs @ 12.14 hrs, Volume 2,259 cf Primary - 0.66 cfs @ 12.14 hrs, Volume= 2,259 cf, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00•-20.00 hrs, dt= 0.05 hrs Link 2L: Design Point 2 Hydrograph i I [ I I I I I I [ I I 1 r I I I --,----r---,---�---- - _--r---,----1---- ---,----�- .. 13Inflow I I I I I __. ..r- ---I- ...,- -E--0.66 -i--- ----I----1---J----L- �rlfl. �Pnmary -, -- , -- , cfs . - I I I I - ---- I - -- I -- Qw.Area72Q,08-;&f- 0.65 I I I I I I I I ! € I I t i I I I I € I I 0.551: 1 I 1I _ 1 1 I E 1 I i I I f 0.45; I I I 3 I j I I i 1 I I y, r I I 0.35; I I I I I I I I I I I E I r I I I 1 € I I I I I I I I 0.25" I € I € I I I I I 1 r I E I I € ! v I I I I 3 I s -—————————————— —— 1 € I I E I I I I ! I I 1 1 3 I I f I E I I I 0- 5 6 7 S 9 10 11 12 13 14 15 16 17 16 19 20 Time (fours) 212 Brentwood Circle_Predevelopment Type 11124-hr 25 yr Rainfa17=6.00" Prepared by Sullivan Engineering Group, LLC Page 12 HydroCAD®7.00 sln 001433 © 1986-2003 Applied Microcomputer Systems 12/27/2021 Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points Runoff by SCS TR-20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 1S: Runoff Area=16,668 sf Runoff Depth=2.51" Flow Length=175' Tc=7.2 min CN=69 Runoff=1.14 cfs 3,483 cf Subcatchment 2S: Runoff Area=20,558 sf Runoff Depth=2.07" Flow Length=142' Tc=9.1 min CN=64 Runoff=1,07 cfs 3,555 cf Link 1 L: Design Point 1 Inflow=1.14 cfs 3,483 cf Primary=1.14 cfs 3,483 cf Link 2L: Design Point 2 Inflow=1.07 cfs 3,555 cf Primary=1.07 cfs 3,555 cf Total Runoff Area = 37,226 sf Runoff Volume = 7,038 cf Average Runoff Depth = 2.27" 212 Brentwood Circle_Predevelopment Type i1124-hr 25 yr Rainfall=6.00" Prepared by Sullivan Engineering Group, LLC Page 13 H droCADO 7.00 sfn 001433 OO 1986-2003 Applied Microcomputer Systems 1212712021 Subcatchment 1S: Runoff = 1.14 cfs @ 12.11 hrs, Volume= 3,483 cf, Depth= 2.51" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 25 yr Rainfall=6.00" Area (sf) CN Description 1,128 98 Portion of Roof House 395 98 Walkway 1,918 98 paved driveway 13,227 61 >75% Grass cover, Good HSG B 16,668 69 Weighted Average Tc Length Slope Velocity Capacity Description min (feet) (ftlft) (ftlsec) (cfs) 6.4 41 0.0100 0.1 Sheet Flow, ,,.. Grass: Short n= 0.150 P2= 3.10° 0.2 72 0.0600 5.0 Shallow Concentrated Flow, Paved Kv= 20.3 fps 0.6 62 0.0600 1.7 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 7.2 175 Total Subcatchment 1S: Hydrograph I I 1 1 I ( I I I I I I I E 3 I I I 1 I I I I i I I I E I I I I I I I I I �U�Off i I I I I I I I I I I I I I I 1.14 cfs I I I I I I ! Type;III 24-h1 251Eyr ----1---.._�.._.__L----I----l----I__.. ---�"----1----7----1-.... l E----J---- I I I ! I I 1 I I Rainfall;:&OW I I I E E I I I I I I I E ! E E k Runo1 I I ff ea=16�# I'668:sf 1 I E k I I I E Ruhoff;Vol;UM�=3;483; Cf I I E k I I I 4 1 I I I I { ; Runoff Depth, 3 I I I I I I 1 1 I I I } Flow Lehgth=175' T/'�_7 //� R IC=l :2 lt�I n I 1 I I I ! IAAA _N��� I I I I I I I I I I I I I I I I I I I l I I I I I 1 I f I I I I I 5 6 7 8 9 io 11 12 13 14 15 16 17 18 19 20 Time (hours) 212 Brentwood Circle_Predevelopment Type 11124-hr 25 yr Rainfall=6.00" Prepared by Sullivan Engineering Group, LLC Page 14 H droCAD®7.00 sin 001433 © 1986 2003 Applied Microcomputer Systems 12/27/2021 Subcatchment 2S: Runoff 1.07 cfs @ 12.14 hrs, Volume= 3,555 cf, Depth= 2.07" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 25 yr Rainfall=6.00" Area sf CN Description 1,186 98 Portion of House Roof 1,524 98 Ex. Patio 11,092 61 >75% Grass cover, Good, HSG B 6,756 55 Woods Good HSG B 20,558 64 Weighted Average Tc Length Slope Velocity Capacity Description min feet ftlft ft/sec cfs 7.5 50 0.0100 0.1 Sheet Flow, Grass: Short n= 0.150 P2= 3.10" 0.4 18 0.0100 0.7 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 0.2 30 0.1000 2.2 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 1 A 44 0.0100 0.7 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps _ 9.1 142 Total Subcatchment 2S: Hydrmgraph I I I 1 I I I I I I t I I I I I I I i I I I I } I I I I I �Runaff I 1 I I I p I i I I I i I I I I I 1.07 cfs I I I I I I I I I 1 I I I I I I I ! I ;----;--- --- ---;--Ty e;41[-24_hl 25;y.r... Raillfall6.00`" I I I I I 1 I I I RlunoIff Area"20,:5583 sf I I I I I I I I I 3 I Ru hoff:Vol'u m IT�3 i555i Gf I I I I I ! I I I 'Jf I u Runoff Depth=2.07 3 " 3 I I € I € I I I I I I I f low Lek9th=142" I I 1 I I 1 I I I I I I i I I 1 I I 1 I k I I I I I 1 I I I I I I T' =91 1 lr din I I I I 1 I I I I I I I I VVV I �, I 1 I € 1 E I I I N IV 64 I I 1 I I I E I I I I I I 1 I I I E I I I I I I I I 1 I I I E I I I I I I I I { I I I 1 I I I I I I I I I I I I t I I I ! ! 5 6 7 8 9 10 11 12 13 14 15 16 17 18 18 20 Time (hours) 212 Brentwood Circle_Predevelopment Type 11124-hr 25 yr Rainfall=6.00" Prepared by Sullivan Engineering Group, LLC Page 15 Hy _-- Microcomputer Systems 12/27/2021 roC ®7.00 sn001433 ©19$6-2003 Applied Link 1 L: Design Point 1 Inflow Area = 16,668 sf, Inflow Depth = 2.51`I for 25 yr event Inflow -- 1.14 cfs @ 12.11 hrs, Volume= 3,483 cf Primary = 1.14 cfs @ 12.11 hrs, Volume= 3,483 cf, Atten= 0%, Lag: 0.0 min Primary outflow= Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Link 1 L; Design Point 1 Hydrograph E I , a Inflow I I 1 E I E I I I I 1 E 1.14 cfs Perna I I I f I I i I I 1 I ry Inflow Area=16,668 ;Sf 1 I I 3 I I i I I E 1 I I I I i I I I I I I 3 1 I I E I I I I I I I I I i I I I I I I I 1 I I E 3 I I I I I I ! I I I I l 1 I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I 1 I I E I 3 I I I I 3 I I I 1 I I E I I I I I f Q I E I I I I 7 I I I I I I I I 1 I € E 1 I I I I I I I I I € E I I I I I E I 1 1 I F { { I I I I ( I 1 I I { F I I I I I 3 I I I I 3 f I I 1 I I I i I I I I ? I I E I I I I I I I E I I I I I I { I I I I E 3 I I I 1 1 I 1 I E E 1 n �" M"-✓' ,�;'r F�,!f''../r'' r.�/' ` �� I'm �� ''" u,Fj .',r• �.r Y v�. . VR 5 6 7 8 S 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 212 Brentwood Circle_Predevelopment Type lii 24-hr 25 yr Rainfall=6.00" Prepared by Sullivan Engineering Group, L.LC Page 16 H droCADO 7.00 sln 001433 01986-2003 Applied Microcom uter Systems 12/27/2021 Link 2L: Design Point 2 Inflow Area 20,558 sf, Inflow Depth = 2.07" for 25 yr event Inflow - 1.07 cfs @ 12.14 hrs, Volume 3,555 cf Primary = 1.07 cfs @ 12.14 hrs, Volume= 3,555 cf, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Link 2L: Design Point 2 Hydrograph I € € I € € I 1 I E 1 I e ianflw I I I I E I I I I I € I I E I I 11 A7 cfs 0 Pr1mary I 1 I 1 --- ----I---- --- ----€- _.. Inflow Area-2UA58,,sf- I IL 1 I I I € 3 I I I I I I ! I I I I [ 3 I I I I I I E 1 I I I € 3 I I I I I I I I I I I [ ! I I I I I I I I I I I [ 3 I I I I I I I 1 I I I [ f I I I 1 I I I I I I I [ I I I I 1 I I I I I I 1 € 1 I I I I I I I I I I 1 € S I I 1 I I I I I I I I € f I 1 3 I I I I p 1 I I I E i I I 3 I I I I I I I € f I I I I I I I I I I I € 1 I I 1 1 I I I 1 I I I € f I 1 3 I I I I I I I € t I I 1 I I I I 1 I I I E E I I I I I I I 1 I I I E I I I I I I I I I I I [ I I I 3 I I I I I I E I I i I I I I I I € I ! I I 0 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (Hours) 212 Brentwood Circle Predevelopment Type 1/124-hr 100 yr Rainfall=8.60" Prepared by Sullivan Engineering Group, LLC Page 17 Fi droCADO 7.00 sln 001433 ®1986-2003 Applied Microcomputer Systems 12/27/2021 Time span=5.00-20.00 hrs, dt=0.05 hrs, 301, points Runoff by SCS TR-20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 1S: Runoff Area=16,668 sf Runoff Depth=4.54" Flow Length=175` Tc=7.2 min CN=69 Runoff=2.07 cfs 6,303 of Subcatchment 2S: Runoff Area=20,558 sf Runoff Depth=3.96° Flow Length=142' Tc=9.1 min CN=64 Runoff=2.08 cfs 6,776 of Link 'I L: Design Point 1 Inflow=2.07 cfs 6,303 of Primary=2.07 cfs 6,303 of Link 2L: Design Point 2 Inflow=2.08 cfs 6,776 cf Primary=2.08 cfs 6,776 cf Total Runoff Area = 37,226 sf Runoff Volume = 13,079 cf Average Runoff Depth = 4.22" 212 Brentwood Circle_Predevelopment Type II! 24-hr 100 yr Rainfall=8.60" Prepared by Sullivan Engineering Group, LLC Page 18 HydroCAM 7.00 sln 001433 © 1986-2003 Applied Microcomputer Systems 12/27/2021 Subcatchment IS: Runoff Z07 cfs @ 12.11 hrs, Volume= 6,303 cf, Depth= 4.54" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 100 yr Rainfall=8.60" Area sf CN Description 1,128 98 Portion of Roof House 395 98 Walkway 1,918 98 paved driveway 13,227 61 >75% Grass cover, Good HSG B 16,668 69 Weighted Average Tc Length Slope Velocity Capacity Description min feet ftlft) (ftlsec) (cfs 6.4 41 0.0100 0.1 Sheet Flow, Grass: Short n= 0.150 P2= 3,10" 0.2 72 0.0600 5,0 Shallow Concentrated Flow, Paved Kv= 20.3 fps 0.6 62 0.0600 1.7 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 7.2 175 Total Subcatchment 1S: Hydrograph I ! I I 3 I 1 I I 3 € I I E i I I I I I 1 {�Runoff 2.07 cfs ; ---- 2- ' E 3 ; Type 12 -hr ,1001yr E I I I I I 7 I I I 1 E I 3 E Rairlfallr8.60" I 3 I I I E I I 1 I E R'Iundff Area=I16,I E'668�sf I I 3 I I I I [ I E I I E ;Ru noff;VOIEU M =6,;303;cf I I I I 3 Runoff Depfh,=4.64"" 1 . I 1 Flow Le-h9th "175 I } I I I 1 { I I I € I I I f I I I I E I I 1 I I k I I I E I I 1 71I 2 I t I I I € I I I T€C� ln` I k I I I I € I I I I I I I 1 I I I E I I € € CN=,69 F/ I I k I I I I I E I I I I I I I 1 I I I I I € I I I I I I I 1 i I I I I f I I I I I I I 1 ! I I I I I 1 I I I I I 3 I I I 1 I I ISli; I I I I I I I I i 1 I I I r p � -�rya a' .i . ., J l •' r ' ' i 0- 5 All 7 fl 9 10 11 12 13 14 15 16 V 18 19 20 Time (hours) 212 Brentwood Circle_Predevelopment Type 111 24-hr 100 yr Rainfafl=8.60" Prepared by Sullivan Engineering Group, LLC Page 19 HydroCAD®7.00 sln 001433 © 1986-2003 Applied Microcomputer Systems 12/27/2021 Subcatchment 2S: Runoff - 2.08 cfs @ 12.13 hrs, Volume= 6,776 of, Depth= 3.96" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 100 yr Rainfatl=8.60" Area sf CN Description 1,186 98 Portion of House Roof 1,524 98 Ex. Patio 11,092 61 >75% Grass cover, Good, HSG B 6,756 55 Woods Good HSG B 20,558 64 Weighted Average Tc Length Slope Velocity Capacity Description min feet ftlft ftlsec cfs 7.5 50 0.0100 0.1 Sheet Flow, Grass: Short n= 0.150 P2= 3.10" 0.4 18 0.0100 0.7 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 0.2 30 0.1000 2.2 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 1.0 44 0.0100 0.7 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 9.1 142 Total Subcatchment 2S: Hydrograph I , , I I 3 I I I Q I I I I I I I �Runoff E 3 3 I ----I�---�- ----;-T 1 e-l1-24�hr�100 --r- 2- I I I I -- I -- ! Y Y p Rainfall--8.60" ! I I I I I I I E I I I E 3 Rlundff Area=20 :558E sf ! I I 1 ! 7 ?may^ I I [ I 1 �I i I I I I i I I I t I i Runoff,Vo(u mI�=6,�;776,cf I I I I I I I I 3 I I I S Runoff Depth -3.96" 3 I U. I Flow Lein9th=142' - I 1 I I I I I I I I I I I I I I I 1 I I I I I I I I I I I I I Thy-- ^ I 9�1 in ,'`Ni64 Y I 1 € I ] I I I l I I E I I I I E I I I I I F I I I E I I I I I I 3 I I I I I € E I I s '✓���f/�.,.<' .ir. � �"�`_.,..''�� �.! Sri^' Q— s 6 7 8 9 10 11 12 13 14 1s 16 17 18 19 20 Time (hours) 212 Brentwood Circle_Predevelopment Type /if 24-hr 100 yr Rainfall=8.60" Prepared by Sullivan Engineering Group, LLC Page 20 H droCADO 7.00 sln 001433 @ 1986-2003 Applied Microcomputer Systems 12/27/2021 Link 1 L: Design Point 1 Inflow Area = 16,668 sf, Inflow Depth = 4.54" for 100 yr event Inflow 2.07 cfs @ 12.11 hrs, Volume= 6,303 of Primary = 2.07 cfs @ 12,11 hrs, Volume= 6,303 of, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Link 1 L: Design Point 1 Hydrograph I I I E I I I I I 1 I I I I E E I I I I 1 3 ! 1 I ( E E E 3 I ®Inflow [ ! I 1 I I I I E 1 I Prima 1 I I I 1 I I I E I I ! 'l r--- ----1- 2.07efs --- rnfrovvI �Airea= 6- 68 'sf._. I E 1 r^ I I I I 1 E I 2- I I F I E I I E I I I 1 I i I f I I I I I I E I ! I € I I 1 I I E E 3 I I I I ! E I 1 € I 1 I I I I I I ! 3 E 3 E I I E I I I 3 I I I f I I E E I I I I I I I I I E ! I I I I I I I I I E I E f I I I I I 1 I I I I E I I I k I I E 1 I I I t ! I I f I I I t I I I I I I I I I E I I E I I I I E f I I E I I I I k I 1 E ! I 1 I I I I I E I I E I I I I I I E I ! I I I I I I I I I I i I I I 1 I I I f I € 5 6 7 6 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 212 Brentwood Circle_Predevelopment Type 11124-hr 100 yr Rainfall=8.60" Prepared by Sullivan Engineering Group, LLC Page 21 H droCADO 7.00 sln 001433 © 1986-2003 Applied Microcomputer Systems 12/27/2021 Link 2L, Design Point 2 Inflow Area = 20,558 sf, Inflow Depth = 3.96" for 100 yr event Inflow - 2.08 cfs @ 12.13 hrs, Volume= 6,776 of Primary = 2.08 cfs @ 12.13 hrs, Volume= 6,776 of, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Link 2L. Design Point 2 Hydrograph I I E E i I I I I I I I I I M Inflow O f]rimary I ! I I I 8s7-------- - ---j--- 2.08 cfs - I -- 1 -inflow Iirea=2Q 58-;sf 2- I 1 7 I I � I i I I i I I I I i I 1 I I I I I I I I ! I I I 1 I f I I 3 I I I h I I I I I i I I I I I I I I I I I ! I I ! I I I I I I I E I I E I 1 { I 3 I 1 I I f I I I 1 I I { I I I I ! I ! I I 1 I { I I I I I I t ! I I 1 I I 1 I ! I I I I I N 1 ! I I { I I I I E I I I i 1 f I I I I I I I I 1 I I 1 I I I I I I ] I I I I 1 I I 3 I I I I I I I I E I I I I I I ! I 1 I I 1 I I I I I I I I I 1 I E I I E I I I I E I 1 E I I h I I E I d 1 0— 5 6 7 a 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 212 Brentwood Circle_Predevelopment Type III 24-hr half inch event Rainfall=0.50" Prepared by Sullivan Engineering Group, LLC page 22 H droCADO 7.00 sln 001433 © 1986-2003 Applied Microcomputer Systems 12/2712021 Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points Runoff by SCS TR-20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 15: Runoff Area=16,668 sf Runoff Depth=0.00" Flow Length=175` To=7.2 min CN=69 Runoff=0.00 cfs 0 of Subcatchment 2S: Runoff Area=20,558 sf Runoff Depth=0.00" Flow Longth=142' Tc=9.1 min CN=64 Runoff=0.00 cfs 0 of Link 1L: Design Point 1 lnflow=0.00 cfs 0 cf Primary=0.00 cfs 0 of Link 2L: Design Point 2 lnflow=0.00 cfs 0 of Primary=0.00 cfs 0 of Total Runoff Area = 37,226 sf Runoff Volume = 0 cf Average Runoff Depth = 0.00" 212 Brentwood Circie_Predevelopment Type i1124-hr half inch event Rainfa11-�0.50" Prepared by Sullivan Engineering Group, LLC Page 23 H droCAD®7.00 sln 001433 01986-2003 Applied Microcomputer Systems 12/2712021 Subcatchment IIS: Runoff = 0.00 cfs @ 5.00 hrs, Volume= 0 cf, Depth= 0.00" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type 111 24-hr half inch event Rainfall=0.50" Area sf CN Descri tion 1,128 98 Portion of Roof House 395 98 Walkway 1,918 98 paved driveway 13,227 61 >75% Grass cover, Good HSG B 16,668 69 Weighted Average Tc Length Slope Velocity Capacity Description min (feet)___ ft/ft ftlsec cfs 6.4 41 0.0100 0.1 Sheet Flow, Grass: Short n= 0.150 P2= 3.10" 0.2 72 0,0600 5.0 Shallow Concentrated Flow, Paved Kv= 20.3 fps 0.6 62 0.0600 1.7 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 7.2 175 Total Subcatchment 1 S: Hydrograph I I E E I I # I I E I 1 € I l"ype 111 24.hr half inch event Rainfall=0.50" I f 3 i I I 7 I F I 4 I I I 3 Rdnoff Area=18,668 sf ff V I 1 �i !unoolumeI =0 cf I 3 3 I I I I E 1 I I I I I f Runbff Depth=0.00" I I I 3 I I I I I I I I I I 0 j Flow Length=175' I I I E 1 I I I I E € ITc=7,2 min 3 I I I I I I I I 1 I I I € I I I 1 I 1 I I 1 I I 1 CN-"69 I I i I I I I 1 1 I I "Y I I I t { I I I I 1 I 1 I 1 I I I 1 I I I I I 3 I I ! 3 I 1 I I I I I I 1 1 I I 1 1 I I 1 1 I I I 1 I I I I 1 I I I I I I ! I I I I I I 1 1 I I E I I E I I I I I ! I 1 I I I I I E I I I E I I I 1 I I I I I I I I I E I I I 1 I I I I I I I I I € I I I 0.00 cfs I 5 6 7 a 9 10 11 12 13 94 15 16 17 18 19 20 Time (hours) 212 Brentwood Circle_Predevelopment Type 11124-hr half inch event Rainfall=0.50" Prepared by Sullivan Engineering Group, LLC Page 24 M droCADO 7.00 sln 001433 01986-2003 Applied Microcomputer Systems 12/27/2021 Subcatchment 2S: Runoff = 0.00 cfs @ 5.00 hrs, Volume= 0 cf, Depth= 0.00" Runoff by SCS TR-20 method, UH=SCS, Time Span 5.00-20.00 hrs, dt= 0.05 hrs Type Ill 24-hr half inch event Rainfall=0.50" Area sf CN Description 1,186 98 Portion of House Roof 1,524 98 Ex. Patio 11,092 61 >75% Grass cover, Good, HSG B 6,756 55 Woods Good HSG B 20,558 64 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) ftlsec) {cfs} 7.5 50 0.0100 0.1 Sheet Flow, Grass: Short n= 0.150 P2= 3.10" 0.4 18 0,0100 0.7 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 0.2 30 0.1000 2.2 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 1.0 44 0.0100 0,7 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 9.1 142 Total Subcatchment 2S: H ydrograph I I F I ] E I I I t I I , I I I I I I �Rl€Hoff Type III 24-hr; half inco event I Rai nfa l'1=0.50" 3 I I I 1 € I 1 I I I 3 I I I f I I 1 I I I I I 3 E Runoff Area=20,558 sf hun6ff Volurime=0 cf 3 I I I I I I I E I € E I f Runbff Depth, =0.00" { Fl6w L,engfh=142' LL 1 I I € I I I I I I I ! ITc,... .1 min t I I I I I I I I I I I I € 1 I I I I 1 I I 1 I I CW64 E I I I I I I I i I I I E I I I I I 1 I i I I 1 € € I I I I I I I I 1 I ! E E I I I I I 1 I I 3 I I ! ! E I I I I I h I I i I I E E E I I I I € I I I I I € € E I I I I E I I I I 1 E I E I I I I ! I I 1 I I I I E I 3 I 1 I I I 1 I 1 I I U.LO cfS E I , I I I I I 1 3 I I I I 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 212 Brentwood Circle_Predevelopment Type 11124-hr half inch event Rainfall=0.50" Prepared by Sullivan Engineering Group, LLC Page 25 HydroCAQ®7.00 sln 001433 © 1986-2003 Applied Microcomputer Systems 12127/2021 Link 1 L. Design Point 1 Inflow Area = 16,668 sf, Inflow Depth = 0.00" for half inch event event Inflow = 0.00 cfs @ 5.00 hrs, Volume= 0 cf Primary - 0.00 cfs @ 5.00 hrs, Volume= 0 cf, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Link 1 L; Design Point 1 Hydrograph F I I I I I I I I 1 € I I 1 { € 1 I I I I E i S I I 1 I ®Inflow 1 I I I I I 1 I I i I I I I I 1 I I E ! I E I I I Primary I I I I I I I Jnfl�w Area=i 6A8 ;sf E I I d € I I I 1 I 1 f I I I I I I I I I E € I E I € I I I I I I I I E I E 3 I I I I I I I E I # I 1 I 3 I I 1 I I I I E I 1 I E I I 1 I 1 E I I I 4 I 1 I 3 I I I E I I I 1 I t 1 1 1 I I I I h N I I 1 1 I I I I I I I 1 I I I I I 1 I I I I I I I I 1 ! I 1 E I I I I I I I I I I I I E I I I I 1 I I - I I I I € 3 ! I I I I 1 1 I I I I I € 7 E I I I I I 3 I I I E I 1 I E I I I I I 1 I I E E 3 I f I I I I I I I I i F I i I I I I I I I I I I ! I I 3 I I f 3 I I I I I I 3 I I 3 I € I ! f 1 I I I 1 3 I 1 3 E I I I 3 ( I 0.00 cfs i,. 5 6 7 II 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 212 Brentwood Circle_Predevelopment Type 11124-hr half inch event Rain fall=0.50" Prepared by Sullivan Engineering Group, LLC Page 26 HydroCADO 7.00 sln 001433 O 1986-2003 Applied Microcomputer Systems 12./27/2021 Link 2L: Design Point 2 Inflow Area = 20,558 sf, Inflow Depth = 0.00" for half inch event event Inflow - 0.00 cfs @ 5.00 hrs, Volume= 0 of Primary = 0.00 cfs @ 5.00 hrs, Volume= 0 cf, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Spam 5.00-20.00 hrs, dt= 0.05 hrs Link 2L. Design Point 2 Hydrograph I I I 1 1 I I I E I I I I I I I I I I I I I E I I I I i 1 I I ®3nnIIVJ Jnf1ow ;Area=20A58 sf I I I I E I I 3 I I I I I i I I E I I I I I I t i 1 I I I E I I I I I I I E I 1 I I I I I I f I I I ! E I I I 1 I I I f E I I I 1 I i I I I I I I i I I I I 1 I } I I I I I I E I 1 I I i I F I I I i I I i I I I I f I F I I I I I I I I 1 I I f I F I I I { I I I I I I I 3 I F I I I I I I I I I I I f I I f 1 1 1 I I I I I I I 1 I 1 1 I t I I I I I I I I 0.00 cfs 5 6 7 8 9 1( 11 12 13 14 15 16 17 18 19 20 Time (hours) POSTDEVELOPMENT DRAINAGE MAP ff y - �- N25'0553"W tQ2 =~~~ 150,00' 1 DESIGN POINT1 Rebor w/ 38' Cap Fnd \ \ \ i p+� _ 1 I - 96 ASSESSdt s �� IS ASSESSOR 1v — \ PIS OWNER/ 104— ---- ------1�\\ �\ � \ jSi ssxs I 11OHN c NORTH AND DEED 106-- ---. _ \ t° o /1�a � BOOK. 1t 0Ir2 \\ 911 EX. 6"PAC 1 a SEWER SERVICE II —- 1N5FAL-LE7t ON 4 ie5=a l 6-2-1x995� I �AQ2 �v iol 1�.2jcr 611. Cone. _ Ste' 1a6 a / �lveway—_ Ins=I I \\ 102=7 0 o a / \\ fix. Walkway I 4 / toe a \ �50.2' F;E--7 FE=1 �n cow / i ai Ex. 2 Story low 2 Car Im tart er g —1.0ture A L3F / oo� '•c Alt o, Z, losx5 `"A Prop. Min. 4 Foot High o tas=, � n Fence to surround pool patio with self-closlag & self lotchfng gotes ) \ , iosxfl Ex Patio A IA to WN21-- Prop. / Prop. 4` NOS Spee D Soli / Channel Drain w/plostiC ' POOL DRAWD04VN �tooc / / grate (Grate ®EIAIG4.2') Area WHEN WATER IS PUMPED rorx3 � 7 J --p 104-__ FROM THE POOL IT SHALL - o4.2r- (i0a.$)� - oa. BE DISCHARGED TO THE 10sAi / 104.5 RIVER ROCK DRAINAGE P`a� / Prop. ingrovnd Pod T TRENCH TO PROMOTE � 1 tj � � / 18, x 38' RECHARGE. SUFFICIENT STORAGE IS PROVIDED IN _ /Ao�,� \/ / Elm=104.5' TRENCH WITH NO O RFLOW —w 105 � t°a,a \ / 1 r Pa t o to. a v Limit of Disturbance /! FQ4 z y1'3, b' 3 per Town Consultant Request r� 4 4— 1� L.S SOILS INFORMATION.' f� � ' (104) TH-1 TEST PI r WAS PERFORMED DY' p� y \ 1�— 32•D' a JOHN D. SULLIVAN 111, P.E,C.S.E �'J los=s \ A� r�r� .� it;' ON 11/20/21 Ex. Treelfne 7EST PIT: 7H-1 op, tazx9 ELEV=fO.x7�t ION2 I r *- Shed 11 NPR, A FSL 10 YR 3/3 latys ` .— —._ ——...y. NOR 9w ESL 10 YR 6/8 90.4' ——— — 21'-98' C--CAYFR SL 2.5 Y 5/4 �'tip3~ ` — hTOTRES W NONE WATER WEEPING®NONE PERC.0 241 12 MPI DESIGN POINT#2 PERC HOLE DEPTH' 24"--42" PRESOAKED HOLE FOR 15 MINUTES. LOT AREA PROIADE TREE PROTECTION FENCING TIME OF TEST 0 12" MARK ON RULER: 1:05 PM AROUND ANY TREES WITHtN TREEtTNE TIME OF TEST 0 9" MARK ON RULER: 1:41 PM 44,000 S.F.f THAT ARE CLOSE TO WORK AREA. SNOW TIME 12' 9 FENCING TO BE PLACED MTH1N TREELINE 36 MIN...P£RC RASE: i2 MPI ALONG WTH EROSION BARRIER AS EXTRA S2'4 PROTECTION OF TREES/ROOT SYSTEMS. TAX MAP 64 61N/F OARBA D CI RC E 5 753 t Z„E ES TAXMAP64 �� __ Nl, 120 RR N n.,C07 58 1 S i' 2S 3 Remainin and 2S_1 f� 2S_2 1L A Design Point 1 8'Wx5' Crushed Stone I iltration Trench 2P 4'Wx4'DCrushed Stone 21 Inflltratlon Trench Design Point 2 Subcat Reach pnj Drainage Diagram for 212 Brentwood Circle_Postdevelopment Prepared by Sullivan Engineering Group, LLC 12/27/2021 HydroCAD©7.00 sln 001433 0 1986-2003 Applied Microcomputer Systems 212 Brentwood Circle_Postdeve[opment Type 11124-hr 2 yr Rainfall=3.20" Prepared by Sullivan Engineering Group, LLC Page 2 I I droCADO 7.00 s{n 001433 O 1986-2003 Applied Microcomputer Systems 12/2712021 Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points Runoff by SCS TR-20 method, UH=SCS Reach routing by Stor-ind+Trans method - Pond routing by Stor-Ind method Subcatchment 1 S: Runoff Area=16,668 sf Runoff Depth=0.70" Flow Length=175' Tc=7.2 min CN=69 Runoff=0.29 cfs 974 of Subcatchment 2S_1. Runoff Area=6,801 sf Runoff Depth=1.43" Tc=6.0 min CN=82 Runoff=0.28 cfs 808 of Subcatchment 2S 2: Runoff Area=2,572 sf Runoff Depth=0.53" Tc=6.0 ruin CN=65 Runoff=0.03 cfs 114 of Subcatchment 2S-3: Remaining Land Runoff Area=11,185 sf Runoff Depth=0.26" Flow Length=142' Tc=9.1 min CN=57 Runoff=0.04 cfs 246 cf Pond 1P: 8'Wx5'DCrushed Stone Infiltration TrePeak Elev=100.62' Storage=310 of Inflow=0.28 cfs 808 of Discarded=0.03 cfs 806 of Primary=0.00 ofs 0 cf Outflow=0.03 cfs 806 of Pond 2P: 4'Wx4'DCrushed Stone Infiltration TrencPeak Elev=99.44' Storage=25 of Inflow=0.03 cfs 114 of Discarded=0.01 cfs 114 of Primary=0.00 cfs 0 of Outflow=0.01 cfs 114 of Link 1 L: Design Point 1 Inflow=0.29 cfs 974 of Primary=0.29 cfs 974 of Link 2L. Design Point 2 Inflow=0.04 cfs 246 cf Primary=0.04 cfs 246 of Total Runoff Area = 37,226 sf Runoff Volume = 2,143 cf Average Runoff Depth = 0,69" 212 Brentwood Circle_Postdevelopment Type 1i124-hr 2 yr Rainfa11:�3.20" Prepared by Sullivan Engineering Group, LLC Page 3 H droCAD®7.00 sln 001433 OO 1986-2003 Applied Microcomputer Systems 12/27/2021 Subcatchment 1S: Runoff = 0,29 cfs @ 12.12 hrs, Volume 974 cf, Depth= 0.70" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type Ill 24-hr 2 yr Rainfal[=3.20" Area sf CN Description 1,128 98 Portion of Roof House 395 98 Walkway 1,918 98 paved driveway 13,227 61 >75% Grass cover, Good HSG B 16,668 69 Weighted Average Te Length Slope Velocity Capacity Description min (feet) ftlft ftisec cfs 6.4 41 0.0100 0.1 Sheet Flow, Grass; Short n= 0.150 P2= 3.10" 0.2 72 0.0600 5.0 Shallow Concentrated Flow, Paved Kv= 20.3 fps 0.6 62 0.0600 1.7 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 7.2 175 Total Subcatchment 1S: Hydrograph ---- --...J....,,-.-I- --_I---- - r+ 0.32- I I Runoff 0.29 cfs € I I I I • .... I _---I-----I- 224hr0.20 Ty --- --- €pe , [ -- yr- I I I 0.26= ----r---1-- ---- ---�--- : _ ----€--Roinfall=3.20"-. 0.24 0.22:''` 3 Run, rea='I 68_4 - 0.2 IN/ - • I I I I I ---Runoff:Vol ame-974-:1d- 0.16 ' Runoff Qepth::�0.70"" 5: 0.14- Flow- -- _L --- --L- Flow-L-en'gth=175' I I I I 0.12 0.1: I 0.06:• ,. 1. 1. Ir- I !!Ir y!II ff - - >-- € >, II I 33 !!I----.0 0.0s: ----- 0.04- I, ._ .........IL..._-- r I I ! 1 I 3 I I 3 I 1 I 0.02- I 0- 5 6 7 6 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 212 Brentwood Circle_Postdevelopment Type ill 24-hr 2 yr Rainfall=3.20" Prepared by Sullivan Engineering Group, LLC Page 4 HydroCADO 7.00 sln 001433 ©1986-2003 Applied Microcomputer Systems 12/27/2021 Subcatchment 2S 1: Runoff 0.28 cfs @ 12.09 hrs, Volume= 808 cf, Depth= 1.43" Runoff by SCS TR-20 method, UH=SCS, Time Span 5.00-20,00 hrs, dt= 0.05 hrs Type III 24-hr 2 yr Rainfall=3.20" Area sf CN Description 1,064 98 Pool and Patio Area 1,186 98 Portion of Ex. House Roof 1,524 98 Ex. Rear patio 3,027 61 >75% Grass cover, Good HSG B 6,801 82 Weighted Average Tc Length Slope Velocity Capacity Description min feet Oft) ftlsec cfs 6.0 Direct Entry, Direct Subcatchment 2S '1: Hydrograph 1 I i 0.3 I I € E 1 Runoff r- --- --- -.. 28 cfs -'----L---_,......- ----I----1----'-- - I I I I ! I I 0.28_ ---- �___ ; Typetlli-24=h'r 2-yir r----.I._---r--- ----r--.....3-.-.__ ----r- r 0.26• I 1 .,.l 0,24 E 1 3 1 I I ..r ---____-- _-_- - ,-RLInoff Area--6-8O1-:sf 0.2� ' l - I I u`m e 0 - no -u 0.16. ----F--- ---Runoff-QepII t-h=II .431- 0,14; I 0.12- c- m>!n ! E I I I 3 I I 0.08" E 0.04` 1 3 I I I I I a I I 1 E 0- 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 212 Brentwood Circle_Postdevelopment Type III 24-hr 2 yr Rainfall=3.20" Prepared by Sullivan Engineering Group, LLC Page 5 H droCADO 7.00 sln 001433 01986-2003 Ap2lied Microcomputer Systems 12/27/2021 Subcatchment 2S 2: Runoff = 0.03 cfs @ 12.11 hrs, Volume= 114 cf, Depth= 0.53" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 2 yr Rainfall=3.20" Area (sf) CN Description _ 288 98 Shed Roof 2,284 61 >75% Grass cover, Good HSG B 2,572 65 Weighted Average Tc Length Slope Velocity Capacity Description min feet ftlft ftlsec cfs 6.0 Direct Entry, direct Subcatchment 2S 2: Hydrograph I 0.034 ----I i ----a----I----a----}---F6.63 cfs ------'---------I--- ------ . _r.. ..... ..1.._._.... 0.032: T " ----I----a----I---- --------k-- ---�---'--- I i E I 1 I I kpe, III4=1r-2.,yr... 0.028 -€-----I---------I ----_---- -- --- -------- --Rainfall ..... E 1 i I I I I I I f 0.026- c ———-E——-7-———I`——`'y————}————i—— -} I- 0 02�. E I Run off Area=2; -721 f- ..... --E--._...._i._.........,L..... .... .. ...........;....- .... T .. _.-- Y - - _-I----r----I----r--- 1----r---- 0.022Z .._._- ,-------------_---- -- --.Runoff Vdlunrie=114 :cf- ^ ' E i 1 I } I I I I E I I u 0.018- O /� � •,� -_.-.---'-'-`EE€I----_-._-.`Ji'i,i-...-...-..,-_-'3I1--------.---,.,'.,II --_—----Si1_------- 0,06U- ------- --------- rI III TO- IrI =6_'.IEII o 0.014 ----3--- ---l---r 0.012 ————r----——--r—— ? I'I • -5n- —.- .,- .. 0.01- 0.008 E 0.006: 1 ____I____J____I____J____i____1__ __. __I____L_—_ ___ .,I., 0.004. 0.002 0- i I i 3 I 1 I I I I E I f i 3 I 1 I I I I 1 f M 5 fi 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 212 Brentwood Circle_Postdevelopment Type I// 24-hr 2 yr Rainfall=3.20" Prepared by Sullivan Engineering Group, LLC Page 6 H droCADO 7.00 s/n 001433 9) 1986-2003 Applied Microcomputer Systems 12/27/2021 Subcatchment 2S_3: Remaining Land Runoff = 0.04 cfs @ 12.33 hrs, Volume= 246 cf, Depth= 0.26" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 2 yr Rainfall=3.20" Area sf CN Description 4,429 61 >75% Grass cover, Goad, HSG B 6,756 55 Woods Good HSG B 11,185 57 Weighted Average Tc Length Slope Velocity Capacity Description min fleet ft/ft ft/sec cfs 7.5 50 0.0100 0.1 Sheet Flow, Grass: Short n= 0.150 P2= 3.10" 0.4 18 0.0100 0,7 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 0.2 30 0.1000 2.2 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 1.0 44 0.0100 0.7 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 9.1 142 Total Subcatchment 2S-3: Remaining Land Hydrograph I I I I f I E 1 E I 0.04= I I Q Runoff ----1---- ,----1---- 0.04 cfs ' ----E----r---- - . -,----r--- Q.D3a= `. I I E I 0.036 -__,E..,. I Type-III-24�h.r-2-; r —_ 1 ___- _ ____ ___________ 0.0322 __'I1----1----1---- -_- -------3--- - ----1 . �. R In 11 3.2�" E — Q.D28 ,---- 1----;----;-- -Runv f�Area .'� 1 y'i-85- S - 0.026 024 ;----'�---;--- ; lun4ff Vo .una-e= 46-"cf. .. 0,022 o 0.02- - -- ---;----,-- --T-- -�- R-unOf_Qepfh�Q-.20.�- LL 0,018- ` —_——I———— I————I———- I -.—— I ---j-— —-Len, '-- D.Q16 -I-- - I --- -------- - - -_E-RowLength� 42-- I I I I 1 I ; I 3 1 I 0.014= ----I--- -I-- _ : - -- --- - ----, -----Tc=9- 1=-min-- 0.Q12- _ !.._. JIJ 0,D1' . arrir i I ----i----i— I----i l .GN^ 0.004.- I I I I "' �. w yl" J° -✓'uu. Q.Q02 I D M "' 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 212 Brentwood Circle_Postdevelopment Type 11124-hr 2 yr Rainfall=3.20" Prepared by Sullivan Engineering Group, LLC Page 7 H droCAD®7.00 sln 001433 01986-2003 Applied Microcomputer Systems 12/27/2021 Pond 1 P: 8'Wx5'DCrushed Stone Infiltration Trench Field Percolation Rate of Soil = 12 MPI Design Rate=24 MPI Inflow Area = 6,801 sf, Inflow Depth = 1.43" for 2 yr event Inflow - 0.28 cfs @ 12.09 hrs, Volume= 808 cf Outflow - 0.03 cfs @ 11.75 hrs, Volume= 806 cf, Atten= 89%, Lag= 0.0 min Discarded = 0.03 cfs @ 11.75 hrs, Volume= 806 cf Primary - 0.00 cfs @ 5.00 hrs, Volume= 0 of Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 100.62' @ 12.94 hrs Surf.Area= 544 sf Storage= 310 cf Plug-Flow detention time= 88.4 min calculated for 804 cf(99% of inflow) Center-of-Mass det. time= 87.3 min ( 885.9 - 798.6 ) # Invert Avail.Stora e Storage Description 1 99.20' 1,088 cf 8.00'W x 68.00'L x 5.00'H Prismatoid 2,720 cf Overall x 40.0% Voids # Routing Invert Outlet Devices 1 Discarded 0.00' 0.003470 fpm Exfiltration over entire Surface area 2 Primary 104.20' 5.00'x 20.00' Horiz, Top Stone Limited to weir flow C= 0.600 Qiscarded OutFlow Max=0.03 cfs @ 11.75 hrs HW=99.26' (Free Discharge) T---=Exfiltration (Exfiltration Controls 0.03 cfs) Primary OutFlow Max=0.00 cfs. @ 5.00 hrs HW=99.20' (Free Discharge) t-2=Top Stone ( Controls 0.00 cfs) 212 Brentwood Circle_Postdevelopment Type III 24-hr 2 yr Rainfall=0.20° Prepared by Sullivan Engineering Group, LLC Page 8 HydroCADO 7.00 sln 001433 ©1986-2003_Applied Microcomputer Systems 12/27/2021 Pond 1 P: 8'Wx5'DCrushed Stone Infiltration Trench Hydrograph I I I i E I I I IM I I 1 E { I I 1 I I 1 inflow ' :----I----I--..,,..-r---r---1-- 0.28Cfs -1----r--- IOUEFlDW I I I 3 1 I I I E I I __I____I-- I-p � p Discarded ! ---Inflow:Ar6a#6,801 Sf I"scary � r 0,281 .' -` ----I--- ' I----I----°----I - oa -Eev=' ODr6 '-- i I 0.26 �.. t ova 6 ; _c - - � ,' I i I I I V 1 E I 1 I I f 0.2= O 0.14'0,12 lL I I I I I f I I I I I I I I I I t I I I I E I 1 I I I I _ I -- _,,.I__ I 1 I I r I o.w-: ` I 0.03 cfs 0.04' 0.00 cfs • 0= 5 6 7 II 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 212 Brentwood Circle_Postdevelopment Type 11124-hr 2 yr Rainfall=3.20" Prepared by Sullivan Engineering Group, LLC Page 9 H droCAD®7.00 sln 001433 © 1986-2003 Applied Microcomputer Systems 12/27/2021 Pond 2P: 4'Wx4'DCrushed Stone Infiltration Trench Field Percolation Rate of Soil = 12 MPI Design Rate= 24 MPI Inflow Area = 2,572 sf, Inflow Depth = 0.53" for 2 yr event Inflow = 0.03 cfs @ 12,11 hrs, Volume= 114 cf Outflow = 0.01 cfs @ 12.05 hrs, Volume= 114 cf, Atten= 74%, Lag= 0.0 min Discarded = 0.01 cfs @ 12.05 hrs, Volume= 114 cf Primary 0.00 cfs @ 5.00 hrs, Volume= 0 of Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 99.44' @ 12.60 hrs Surf.Area= 144 sf Storage= 25 of Plug-Flow detention time= 21.9 min calculated for 114 of(100% of inflow) Center-of-Mass det. time= 20.9 min ( 863.6 - 842.7 ) # Invert Avail.Stora e Storage Description 1 99.00, 230 of 4.00'W x 36.00'L x 4.00'H Prismatold 576 of Overall x 40.0% Voids # Routing Invert Outlet Devices 1 Discarded 0.00' 0.003472 fpm Exfiltration over entire Surface area 2 Primary 103.00' 2.00' x 18.00' Horiz. Top Stone Limited to weir flow C= 0.600 Drded OutF'low Max=0.01 cfs @ 12.05 hrs HW=99.06' (Free Discharge) tExfiltration (Exfiltration Controls 0.01 cfs) Primary OutFlow Max=0.00 cfs. @ 5.00 hrs HW=99.00' (Free Discharge) L2=Top Stone ( Controls 0.00 cfs) 212 Brentwood Circle_Postdevelopment Type /// 24-hr 2 yr Rainfall=3.20" Prepared by Sullivan Engineering Group, LLC Page 10 H droCADO 7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems 12/27/2021 Pond 2P: 4'Wx4'DCrushed Stone Infiltration Trench Hydrograph 1 I I I I 3 T EN inflow 1 1 I I I I I I I I 3 I I -......-'---'----`-- 0.03 CfS I I , [I Outflow �E I 1 - 1 I -. 0Prima E _ ®Discarded :' .-- 1 ;----E---i-- - Inflbw�Ar6a=-2j572 .L_ i _L___1___ �- - -- I € -J----I--- --- -- - - peak- Neu99-44' 0.0322 1 • i Q.Q28? -------1--- --- { .... ---�-- --�_ .,.,. -- Storage=25-bf- , r I 1 f I 3 I I I I 0.026: : r r _..... ----r - --r - r I I I 1 I I 3 I I { I r r r 0.022- �.___T___T___ I �r�f,• - 7 T ..� ____E r - 3 ' .•. 0.016. A.-.__L___ 0.014 0.012- OA1 cfs 1 - - Q.Qi' 3 1 I 1 I I I I I i 0.008: --- Eo 06010 o -.00 cfs 'I 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 212 Brentwood Circle_Postdevelopment Type 11124-hr 2 yr Rainfall=3.20" Prepared by Sullivan Engineering Group, LLC Page 11 H droCAD®7.00 s/n 001433 91986-2003 ApRfied Microcomputer Systems 12/27/2021 Link 1L: Design Point 1 Inflow Area = 16,668 sf, Inflow Depth = 0.70" for 2 yr event Inflow 0.29 cfs @ 12.12 hrs, Volume 974 of Primary = 0.29 cfs @ 12.12 hrs, Volume= 974 of, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5,00-20.00 hrs, dt= 0.05 hrs Link 1 L. Design Point 1 Hydrograph .__ __-___J____I____ _ __I____ ____ .., ... ,.I..., ... 1 I I I € I __ Inflow 0.32: 13 Primary 0.29 cfs 6 0.28 I % I I I I I I I f I I E E I I I I I I E 1 I E E I 0,24: ----II---i----I---i___-I- _-' i...._.,.- E ---i----'----i---i----I---- 0.22; I I I I I I I I I I I E I 1 I I I 1 I f I 1 I E I 3 0,16 I IL 0.14- I I I I I 1 I I I I E I 0.12- I I 0.08. I I I I I I 1 I I I I I E I % I 0.041- 0.02= 0= 5 6 7 $ 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 212 Brentwood Circle Postdevelopment Type III 24-hr 2 yr Rainfa11=3.20" Prepared by Sullivan Engineering Group, LLC Page 12 Fi droCADO 7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems 12/27/2021 Link 2L: Design Point 2 Inflow Area = 20,558 sf, Inflow Depth = 0.14" for 2 yr event Inflow = 0.04 cfs @ 12.33 hrs, Volume= 246 cf Primary - 0.04 cfs @ 12.33 hrs, Volume= 246 cf, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Link 2L: Design Point 2 Hydrograph E I E E I I I I E E I 1 E I I I 0Infl.w El Primary y 0.04 cfs -- -' 0.03B= -- I1 1Q--.Ae;ate20,-5,58- sf-- r I I [ 1 1 I E I I I I 0.034; +--- ----E---- ---i-- '--- ---------+--- ---_, -.......... ....... 0.032: ---------------- ------------- --- I 0.028:' ----'----'----L---- I E E f I 1 3 I I 0.024- r I 1 V Q 022 E I E E E I 1 1 I E I ' •, 4 I I E I I E I O.Q16= .I_.._.._.E...___L___1____I_ 0,014 I 0.012: ' I 0.01= I r 0.OQBf i 0.O06- P 0.004= 0.002 s 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 212 Brentwood Circle_Postdevelopment Type 11124-hr 10 yr Rainfall=4.80" Prepared by Sullivan Engineering Group, LLC Page 13 H droCADO 7.00 sln 001433 0 1986-2003 Applied Microcomputer Systems 12/27/2021 Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points Runoff by SCS TR-20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 1S: Runoff Area=16,668 sf Runoff Depth=1.66" Flow Length=175' Tc=7.2 min CN=69 Runoff=0.75 cfs 2,311 of Subcatchment 2S_1: Runoff Area=6,801 sf Runoff Depth=2.71" Tc=6.0 min CN=82 Runoff=0.52 cfs 1,538 of Subcatchment 2S_2: Runoff Area=2,572 sf Runoff Depth=1.39" Tc=6.0 min CN=65 Runoff=0.10 cfs 297 of Subcatchment 2S_3: Remaining Land Runoff Area=11,185 sf Runoff Depth=0.89" Flow Length=142' Tc=9.1 min CN=57 Runoff=0.22 cfs 831 cf Pond 1 P: 8'Wx5'DCrushed Stone Infiltration TrPeak Elev=102.68' Storage=758 of Inflow=0.52 cfs 1,538 of Discarded=0.03 cfs 1,111 of Primary=0.00 cfs 0 of Outflow=0.03 cfs 1,111 of Pond 213: 4'Wx4'DCrushed Stone Infiltration TrePeak Elev=101.26' Storage=130 of Inflow=0.10 cfs 297 of Discarded=0.01 cfs 255 of Primary=0.00 cfs 0 cf Outflow=0.01 cfs 255 cf Link 1 L: Design Point 1 Inflow=0.75 cfs 2,311 of Primary=0.75 cfs 2,311 of Link 2L: Design Point 2 Inflow=0.22 cfs 831 of Primary=0.22 cfs 831 of Total Runoff Area = 37,226 sf Runoff Volume = 4,978 cf Average Runoff Depth = 1.60" 212 Brentwood Circle—Postdevelopment Type 11124-hr 10 yr Rainfall=4.80" Prepared by Sullivan Engineering Group, LLC Page 14 HydroCADO 7,00sin_001433 © 1986 2003 Applied Microcomputer Systems 12/27/2021 Subcatchment 1S: Runoff = 0.75 cfs @ 12.11 hrs, Volume= 2,311 cf, Depths 1.66" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 10 yr Rainfall=4.80" Area sf CN Description 1,128 98 Portion of Roof House 395 98 Walkway 1,918 98 paved driveway 13,227 61 >75% Grass cover, Good HSG B 16,668 69 Weighted Average Tc Length Slope Velocity Capacity Description min feet ftlft ftisec cfs 6.4 41 0.0100 0.1 Sheet Flow, Grass: Short n= 0.150 P2= 3.10" 0.2 72 0.0600 5.0 Shallow Concentrated Flow, Paved Kv= 20.3 fps 0.6 62 0.0600 1.7 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 7.2 175 Total Subcatchment IS: Hydrogrcaph E 1 I 1 a.a: ----r--- ----'r--- ----r-- 0.75cfs -------- 0 75 I Type;Nl 2;4 hH0;yr I I FZ- 0.65- l 3 I k 1 I 0.6- , --- r-.-.....I.... --- ---- ---�-- --Rl�no'�f A�ea16 '668 .sf- � ------f--- Ru-noff,Vollum�=Z31�1-II Cf I I I I I I [ I E 0.5 .-. ----r--- ----I---7----r----1-- -----. ..............„_.___.I__.___I----T----I---- 0.45 r -- Runoff Depth=1.56"-- 0 0,4 ---I--- --I-- --- F'loW-L-elhgth 175'-- � I E 3 I I I 3 I 0.35- I r---1-- ---t----r----I----T- E--- r ---I�-..._ TC' . �In _ � E • N=6J 0,2- , �__._�......... 1-"---r--------r 0.15' i 3 I I I 1 ! I I I k I I I I I € 0.1� I } I I I 1 I •�'�'� I I I I i 0.05- 21 0 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 212 Brentwood Circle_Postdevelopment Type 11124-hr 10 yr Rainfall=4.80" Prepared by Sullivan Engineering Group, LLC Page 15 HydroCAD®7.00 sln 001433 © 1986-2003 Applied Microcomputer Systems 12/27/2021_ Subcatchment 2S 1: Runoff = 0.52 cfs @ 12.09 hrs, Volume= 1,538 cf, Depth= 2.71" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 10 yr Rainfall=4.80" Area (sf) CN Description 1,064 98 Pool and Patio Area 1,186 98 Portion of Ex. House Roof 1,524 98 Ex. Rear patio 3,027 61 >75% Grass cover, Good HSG B 6,801 82 Weighted Average Tc Length Siope Velocity Capacity Description min feet ft/ft ftlsec cfs 6.0 Direct Entry, Direct Subcatchment 2S 1: Hydrograph ! I I I I I I 1 k I ! I I I I I I I I 0.55- ` I 0.52 cfs; ; ; ; ; Typer-'�D yr_. I 1 1 I I I E I �1�( � E h 0.45- ; ; alnN 1-4x801V- I , k_ - .. .. ......I; . ; E , I RI unoI; ff-A1u re 6==8'I ;,18I5 O318I, S-cf0.4 1 1 1 1 1 U J____L---- L___ Loff IVvlL_ n-1'Run0.35 f 0.3 un6 -De- . 1 i i I I I I I I-..-...-...-TIII ----E3 III - lII crnI1 O II E lli_ T-N�82 0,2 _I i 3 I I 3 I I 1 I r____E____.I.,..._...,...E_.... -- �I� I 7 I 0.15 I I I ! I I I I 3 I I I I 0.1 I I I E I E I I I 3 E I I I I I I E I ! I I 3 I I I I 0,05 I I , 0 5 6 7 B 9 10 11 12 13 14 15 16 17 18 19 20 Tune (hours) 212 Brentwood Circle_Postdevelopment Type 11124-hr 10 yr Rainfall=4.80" Prepared by Sullivan Engineering Group, LLC Page 16 H droCAD®7.00 sln 001433 O 1986-2003 A2211ed Microcomputer Systems 12/27/2021 Subcatchment 2S 2: Runoff _ 0.10 cfs @ 12.10 hrs, Volume= 297 cf, Depth= 1.39" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 10 yr Rainfall=4.80" Area (sue__-CN Description 288 98 Shed Roof 2,284 61 >75% Grass cover, Good, HSG B 2,572 65 Weighted Average Tc Length Slope Velocity Capacity Description min feet ftlft ft/sec cfs 6.0 Direct Entry, direct Subcatchment 2S 2: Hydrograph I i I I I 1 I I---. ....._.... ---- .10 cf ---- ---� 0 s - -f-------- E Type- --2--I--- . I --r0.095 r ' y 0.09: ---- --- --- ' -------- ' i_- , -.- :.: ---;----;----,-- ----;- . ...... ......ROinfa11'4�80"-. 0.08, ----+----I- ._ 0.075: :............ --- ----I------- ;-RL1 noff Area=2,572-:Sf- 0.07- ' 1 r 1 I E 1 - A Ir .. �O,tl65 -- --- ----�-- -----�-- - unoffl-Vo�umae=29V& n ' u �.06- L---�----L---J----E-.........._.J____. ���• __J____L____l____L____I____1__.__.I.�-..._. _ 30:055 r--- ,-- ........... ... --Ir---3-- -- ---Rungff-Qepth=�1-39"- 0 0,05'. ----r---1----r---�---- .__........1..-..- 7 ---r--------r----I---*- r- W r I 1 I I 3 I 1 � Il�li 0.045? ------------------ ----T- -I,=U:O n--- 0.045 ---- --- _-`_�_ .._....I..-----I--- -- " --J----i----1----L-----1.__._ -.I..-----'-I----- : r I 1 I I 3 I I r___,_ r___,___- �. I I 0.025 I i I 0.02-' -! ---J----L----'----L----I- r L......- - -- --'---- '-----I---- } I 0.015- (wili - -- -- Y -i� RIOS I I I 3 I 0.005- d 0_ r.1 5 6 7 8 0 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 212 Brentwood Circle_Postdevelopment Type 11124-hr 10 yr Rainfall=4.80" Prepared by Sullivan Engineering Group, L_L.0 Page 17 HydroCAD®7,00 s/n 001433 © 1986-2003 Applied Microcomputer Systerns 12/27/2021 Subcatchment 2S-3: Remaining Land Runoff - 0.22 cfs @ 12.16 hrs, Volume= 831 cf, Depth= 0.89" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 10 yr Rainfall=4.8071 Area (sf) CN Description 4,429 61 >75% Grass cover, Good, HSG B .................. 6,756 55 Woods, Good, HSG B 11,185 57 Weighted Average Tc Length Slope Velocity Capacity Description ---(min) (feet) (ft/ft) (ft/sec) (cfs) 7.5 50 0.0100 0.1 Sheet Flow, Grass; Short n= 0.150 P2= 3.10" 0.4 18 0.0100 0.7 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 0.2 30 0.1000 2.2 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 1.0 44 0.0100 0.7 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 9.1 142 Total Subcatchment 2S�3: Remaining Land Hydrograph I ! I I ] I I . r 0.24: _.....1....._..,.,,...........L..,_.... ..I... ._....I_...._ _..,, . --- ----'---- -------- � ----I" ---1----'---- ORunaff 0.23 0.22 cfs ,-..----; --- : .... . :.........II.... ... ;........ -- 0.22: ----!--- ----'-----'---- ------- -------r ---'--- - - - -- 0.2, ;. ---y---- --- ----'I -" - _.. .. _.... "Type.I L 2 rhr;40.y..r. 1__ 0.9- L___J---- L___J____ I I I 1 I I I I I 0.,7 ----L--- '----L----'-- ---Rurioff�Area 11-,-'I85-:0- E I { E I I 3 I ' 0.15; _. - ---- ---- --- u-noff3.Viau a=:$3.'[-I;cf= I 0.42- L---1----;---;----;---;-- -; --runoff-Qepth 0 o.,_ -------- ow- Length-1-4-'- 1 I I I I I ( I I. 0.07, ----L--- --- -- -- �-Ted,=9-w-l min I I I ! I I I I I I I I 0.05- -- ----II----33----L----k--- -'-- _._.._. G;N- 7 0.04 I I I I I I I I ! 0.03 I I ( I I I 0.02 �_,..._. ---- -- -'......t................ --- ------ ----- 0.01 1 I 0_ 5 B 7 8 9 ,0 „ 12 13 14 15 16 17 ,II 19 20 Time (hours) 212 Brentwood Circle_Postderrelopment Type 1/124-hr 90 yr Rainfall=4.80° Prepared by Sullivan Engineering Group, LLC Page 18 HydroCADO 7.00 sln 001433 GO 1986-2003 Applied Microcomputer Systems 12/27/2021 Pond 1 P: 8'Wx5"DCrushed Stone Infiltration Trench Field Percolation Rate of Soil = 12 MP1 Design Rate=24 MPI Inflow Area = 6,801 sf, Inflow Depth = 2.71" for 10 yr event Inflow = 0.52 cfs @ 12.09 hrs, Volume= 1,538 cf Outflow - 0.03 cfs @ 11.35 hrs, Volume= 1,111 cf, Atten= 94%, Lag= 0.0 min Discarded = 0.03 cfs @ 11.35 hrs, Volume= 1,111 cf Primary = 0.00 cfs @ 5.00 hrs, Volume= 0 of Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 102.68' @ 14.11 hrs Surf.Area= 544 sf Storage= 758 cf Plug-Flow detention time= 183.8 min calculated for 1,107 cf(72% of inflow) Center-of-Mass det. time= 120.2 min ( 904.1 - 783.9 ) # Invert Avail.Stora e Storage Description 1 99.20' 1,088 of 8.00'W x 68.00'L x 5.00'H Prismatoid 2,720 cf Overall x 40.0% Voids # Routing Invert Outlet Devices 1 Discarded 0.00' 0.003470 fpm Exfiltration over entire Surface area 2 Primary 104.20' 5.00' x 20.00' Horiz. Top Stone Limited to weir flow C= 0.600 Qiscarded OutF'low Max=0.03 cfs @ 11.35 hrs HW=99.25' (Free Discharge) "--I=Exfiltration (Exfiltration Controls 0.03 cfs) Primary Outflow Max=0.00 cfs @ 5.00 hrs HW=99.20' (free Discharge) '�---2=Top Stone ( Controls 0.00 cfs) 212 Brentwood Circle_Postdevelopment Type IIl 24-hr 10 yr Rainfall=4.80° Prepared by Sullivan Engineering Group, LLC Page 19 HydroCAD®7.00 sin 001433 © 1986-2003 Applied Microcomputer Systems � 12127/2021 Pond 1 P: 8'Wx5'DCrushed Stone Infiltration Trench Hydrograph I I I I I I I I F I I I I i inflow I I I I 0,52 CfS I I I E I i 0 Outflow I I I I I __ I I I I E I i i' ...... ...... . F �n �OWlArea;6,801 Pdmaryed [ beak EIev�-10;2.60 1 ! Stor`ag6=7�58_cf _ 0.45- I I I I I I I I I 1 r I i I I I I I I 1 I I f 0.4` I I I l I I I I I 1 I 1 I I I V I i I I I I I I I ----------- -------------- ---------------- FL 0.25 I I I 1 I I I I I I I I ! i-_--I--_-I----I--------1----I- ._ _._.1._._._._I.__.._....I._. _...._.t......._.....1-.._. ...,..1.,..,_....E.._..,.._. �•2• I I I k I f l I I I I I E f i I I I f I I I 1 I I I I I 1 Io RqCfs I I 0,1 0.03 cfs 0.00 cfs 0 5 6 7 8 9 10 11 12 13 44 15 16 17 18 19 20 Time (hours) 212 Brentwood Circle Postdevelopment Type 111 24-hr 10 yr Rainfall=4.80" Prepared by Sullivan Engineering Group, LLC Page 20 H droCADO 7.00 sln 001433 @ 1986-2003 Applied Microcomputer S sterns 12/27/2021 Pond 2P: 4'Wx4'DCrushed Stone Infiltration Trench Field Percolation Rate of Soil = 12 MPl Design Rate= 24 MPI Inflow Area = 2,572 sf, Inflow Depth = 1.39" for 10 yr event Inflow = 0.10 cfs @ 12.10 hrs, Volume= 297 cf Outflow — 0.01 cfs @ 11.75 hrs, Volume= 255 cf, Atten= 91%, Lag= 0.0 min Discarded = 0.01 cfs @ 11.75 hrs, Volume= 255 cf Primary = 0.00 cfs @ 5.00 hrs, Volume= 0 cf Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 101.26' @ 13.99 hrs Surf.Area= 144 sf Storage= 130 cf Plug-Flow detention time= 169.1 min calculated for 255 cf(86% of inflow) Center-of-Mass det. time= 126.8 min ( 946.1 - 819.3 ) # Invert Avail.Storage Storage Description 1 99.00, 230 cf 4.00'W x 36.001 x 4.00'H Prismatoid 576 cf Overall x 40.0% Voids # Routing Invert Outlet Devices 1 Discarded 0.00' 0,003472 fpm Exfiltration over entire Surface area 2 Primary 103.00' 2.00' x 18.00' Horiz. Top Stone Limited to weir flow C= 0.600 Discarded Outflow Max=0.01 cfs @ 11.75 hrs HW=99.04' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.01 cfs) Primary OutFlow Max=0.00 cfs @ 5.00 hrs HW=99.00' (Free Discharge) t--2=Top Stone ( Controls 0.00 cfs) 212 Brentwood Circle_Postdevelopment Type III 24-hr 10 yr Rainfall=4.80" Prepared by Sullivan Engineering Group, LLC Page 21 HydroCAl7®7.00 sln 001433 © 1986-2003 Applied Microcomputer Systems 12/27/2021 Pond 2P: 4'Wx4'DCrushed Stone Infiltration Trench Hydrograph I 1 I I I E I --- ®ruin r ®Discarded i :'�• .----I----I---,I----l--------I,-- --- -infib �1-Aroa-,2,572-t - 0p�ma ry I 1 . ...I __. I _ ! -I----I- 0.105. ---I--------'----'--------I-- - - -- ------ --- ----I----I----,I----;----II-- 011-2 0.095. --;-------,---- ---i-- --`- ----1----------------I-- - r _ ._ .i, . - I- ot-raqI -Cf 0.085 --- _30 - r I 0.08� I I I E 1 I I I I € I ! I 0.075` ---I----I----I----E----I---`I - ' r` 3 I I I I I I 0.07- ----------- - .._ . --------- N _ µ. ° ' f ' ____I____I____I____I____I___. .I 1 E I I I I I I I I I a 1 I 1 I I 1 : • ,� f� r I I I I I I 1 I I 1 I I 1 0,045 r ," I I I I I I I I �" I I I I- I I- I I I....�.....I_.., .-If f I�f- I I 0.025. - I 1 1 I - ------ U2: ' 0.01 cfs a.o15- " 0.00 cfs o- 5 6 7 8 9 i0 11 12 13 14 i5 16 17 18 19 20 Time (hours) 212 Brentwood Circle_Postdevelopment Type 11124-hr 90 yr Rainfall=4.80" Prepared by Sullivan Engineering Group, LLC Page 22 HydroCAD®7.00 sin 001433 O 1986-2003 Applied Microcomputer Systems 12/27/2021 Link 1 L: Design Point 1 Inflow Area = 16,668 sf, inflow Depth = 1.66" for 10 yr event Inflow = 0.75 cfs @ 12.11 hrs, Volume= 2,311 cf Primary -- 0.75 cfs @ 12.11 hrs, Volume= 2,311 cf, Atten= 0%, Lag= 0.0 min Primary outflow = inflow, Time Span= 5.00-20,00 hrs, dt= 0.05 hrs Link 'I L: Design Point 1 Hydrograph E .__I____-___!____�____-._,.. ...I_ E I I E r I I f I I E € I I I I I d InfiOW --...�.,.--_�----r--- ----I I----r--_�_-..._.I.......--r--- ----r-- LffMaly 0.75 cfs _ , nf1Qw Ar-6,a=j 6,668 sf-- 0.75: • I 0.7- I L__ E I 1 I _L I 3 I i I i I 3 I I I I E I 3 I 0.55: F I I -0.5 I_ _ F 0.45` I I O0.4: E ! 1 E I I I I I I 3 I 1 W • __...,.[._ ----r---T--_-I-.-. 0.35 r I I 0.3- I I 0.25^ 3 I I I I I I I I 1 I I I r 0.2: _�___�__....E......_.i.- I I I 1 I I I I I I E 6.15 /. _--- ----I---- 1..--- r--- I.... .....I---- I I I I 1 I I I ----I---- ----I--_..,.,....-------r--- 0,1 r 0.05 y F 5 6 7 II 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 212 Brentwood Circle_Postdevelopment Type 11124-hr 10 yr Rainfall=4.80" Prepared by Sullivan Engineering Group, LLC Page 23 HydroCADO 7.00 sin 001433 GO 1986-2003 Applied Microcomputer Systems 1212712021 Link 2L: Design Point 2 Inflow Area = 20,558 sf, Inflow Depth = 0.49" for 10 yr event Inflow - 0.22 cfs @ 12.16 hrs, Volume= 831 cf Primary = 0.22 cfs @ 12.16 hrs, Volume= 831 cf, Atten= 0%, Lague 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Link 2L: Design Point 2 Hydrograph I I I I 3 I I I I I I I _-T- 13 Inflow I I I _ .2a= ; � ..._... 11--------s--- 0.22 cfs - a _ 0,22: ;.--------;----;----;----, -== nf[.Qw �4r-Oa= O,J5:8=9f= 0.21,' -- I I I I ! ! f I € I I I 0.2 0,19Z 0 .17. 1__-_1____L__._1-.-_.___I., _., E„ -....,...I.." J, I„........_.-I..,_.__.I.__.___1.___. i --- s 0.18, � 1I----rI ___---- --------- 0115-, in 0.14' ___r----I----r--- ----E----� --r---r----r--------r---- ----r--- `' ---r----'----'-----' --------'- --'----r---s----'----r---J----'--- 0.13- I I 3 0.12: ° 0.11=' ---- I-----'----'----------I----I - --'----'-----''----'---- '-----'----`---- � I I I I I 0.09� 0.1� _. ----r----I----r---Y----I----r --I----r---y----I----r---rt----t---- I I I I { € I I I I I ! l - • = I I I I { E I I 1 I I f I 0.06:' •`_. - --+--- ---- ---+----E----F ---- --- --------+--- ----I --- � ! 0.02= 0. :4. . . . . .. . . 01 0 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 T6ne (hours) 212 Brentwood Circle_Postdevelopment Type 11124-hr 25 yr Rainfall=6.00" Prepared by Sullivan Engineering Group, LLC Page 24 HydroCADO 7.00 sln 001433 O 1986-2003 Applied Microcomputer Systems 12/27/2021 Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points Runoff by SCS TR-20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 1S: Runoff Area=16,668 sf Runoff Depth=2.51" Flow Length=175' Tc=7.2 min CN=69 Runoff=1.14 cfs 3,483 of Subcatchment 2S_1: Runoff Area=6,801 sf Runoff Depth=3.75" Tc=6.0 min CN=82 Runoff=0.71 cfs 2,123 of Subcatchment 2S 2: Runoff Area=2,572 sf Runoff Depth=2.16" Tc=6.0 min CN=65 Runoff=0.16 cfs 463 of Subcatchment 2ST3: Remaining Land Runoff Area=11,185 sf Runoff Depth=1.52" Flow Length=142' Tc=9.1 min CN=57 Runoff=0.41 cfs 1,413 cf Pond 'I P: 8'WxS'DCrushed Stone Infiltration Peak Elev=104.20' Storage=1,088 of Inflow=0.71 cfs 2,123 of Discarded=0.03 cfs 1,194 cf Primary=0.04 cfs 86 cf Outflow=0.07 cfs 1,279 cf Pond 2P: 4'Wx4'DCrushed Stone Infiltration TrePeak Elev=103.00' Storage=230 cf Inflow=0.16 cfs 463 of Discarded=0.01 cfs 269 of Primary=0.01 cfs 22 of Outflow=0.02 cfs 290 of Link 1 L: Design Point 1 Inflow=1.14 cfs 3,483 of Primary=1.14 cfs 3,483 of Link 2L: Design Point 2 Inflow=0.41 cfs 1,521 of Primary=0.41 cfs 1,521 of Total Runoff Area = 37,226 sf Runoff Volume = 7,482 cf Average Runoff Depth = 2.41" 212 Brentwood Circle_Postdevelopment Type 11124-hr 25 yr Rainfall=6.00" Prepared by Sullivan Engineering Group, LLC Page 25 H droCAD®7.00 sln 001433 GO 1986-2003 Applied Microcomputer Systems 12/27/2021 Subcatchment IS: Runoff = 1.14 cfs @ 12.11 hrs, Volume= 3,483 cf, Depth= 2.51" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 25 yr Rainfall=6,00" Area sf CN Description 1,128 98 Portion of Roof House 395 98 Walkway 1,918 98 paved driveway 13,227 61 >75% Grass cover, Good HSG B 16,668 69 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ftlft) (ftlsec) (cfs) 6.4 41 0.0100 0.1 Sheet Flow, Grass; Short n= 0.150 P2= 3.10" 0.2 72 0.0600 5.0 Shallow Concentrated Flow, Paved Kv= 20.3 fps 0,6 62 0.0600 1.7 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 7.2 175 Total Subcatchment IS: Hydrograph I t I I I I I I { I I I i I I I I I 3 I I I k I p�y I I I I I I I i I I I I E ,y�y}ZufiQlf 1.14 cfs 3 I I 2I I E Type;111 4-h� 25;yr Rainfall I I I I I F I I I I I Rundff Alrea" 16,1668:0 1 I I I I 1 I F I I I I I 1 I I I I I 1 1 I I I Runoff1;VollumI�=3,483;Cf Runoff Depth,=2.51 3 I I I I I 1 4 I I I I I Flow Lehgth= 175' LL I I I I I I i I I I I I I I I I 1 I 1 I I T71 I r I I I I 1 I fi I I ^[ 12 nj[n I I I I I I I I I Ic r 1 I I I I I Ip I I I I I CN49 I I I I I I I I f I I I I I ! I I I I I 3 I I I f E I I E 1 I I I I r I I I I E I I E I I I I I 3 I I f I f I I E 1 I I I I 3 I I f f I I I E 1 I I I 1 I I 1 E I I I ! 1 I I I I I I 1 I L 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Ttme (hours) 212 Brentwood Clrcle_Postdevelopment Type Ill 24-hr 25 yr Rainfall=6.00" Prepared by Sullivan Engineering Group, LLC Page 26 H droCAD®7.00 sln 001433 ©1986-2003 Applied Microcomputer Systems 12/27/2021 Subcatchment 2S 1: Runoff = 0.71 cfs @ 12.09 hrs, Volume= 2,123 cf, Depth= 3.75" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 25 yr Rainfall=6.0011 Area sf CN Description 1,064 98 Pool and Patio Area 1,186 98 Portion of Ex. House Roof 1,524 98 Ex. Rear patio 3,027 61 >75% Grass cover, Good HSG B 6,801 82 Weighted Average Tc Length Slope Velocity Capacity Description min feet ftlft) (ftlsec) (cfs 6.0 Direct Entry, Direct Subcatchment 2S 1: Hydrograph I E I I I I I I I I I I I I 0.75- ----IJ I 0.71 cfs --'----L----'----�---- - 0.7- ' f --- -- Type'111.2,4_-hli"-25-;-y-r-- - r ,: ----r---,----F---7---- 0.55 0.5. r--- ----F----; ;-- --;Ru.�aoff;Volulm =2, .23;c - ^ I I I 1 Runof Depth FI75"-. 3 0.4- ____I--_-I 0.35- 0 3- 1 3 I I I E I I ■/^''" I� I I I E � E I I 0.25''! I I I E E I I E I . ......... -r---y----r--- ----r--- --I`---r----r---r----I---- 0.2": r I i E 1 I I I 1 3 I E I E I I I 1 I I E 1 I I E 0 05- I ¢' 0 5 6 7 © 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 212 Brentwood Circle_Postderrelopment Type i1124-hr 25 yr Rainfall=6.00" Prepared by Sullivan Engineering Group, LLC Page 27 H droCADO 7.00 s/n 001433 @) 1986-2003 Applied Microcomputer Systems 12/27/2021 Subcatchment 2S 2: Runoff = 0.16 cfs @ 12.10 hrs, Volume 463 cf, Depths 2.16" Runoff by SCS TR-20 method, UH=SCS, Time Span 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 25 yr Rainfall=6.00" Area (sf) CN Description 288 98 Shed Roof 2,284 61 >75% Grass cover, Good HSG B 2,572 65 Weighted Average Tc Length Slope Velocity Capacity Description min feet ft/ft ftlsec cfs 6.0 Direct Entry, direct Subcatchment 2S 2: Hydrograph I I I I I I r I 0 17 I ®RunofT 0.16 cfS I € I I L----'----L---J----L------- ----= ---`---■■[ in_-■q125 ---- € I € I ! i I� e [r-1_2A-.[1 2-5-; 0.15 € -------- - 1_, ---- --- -- -----v-- _. __ ___________€____!_______ I € t 0.14 + yN 0.12 - 1_--I----1 11---- ---!-Runoff Area� 57` � 2 2_tf- 3 0.11' ------- ._.........I....... - - - -' - 0.1- ; unoff;Vo aM`Lit 63 ;Cf ---- I � I € I I " 0 08 I I I 1 r I I E I � �� 3 ;--- ;----r---;-- -- Runoff-Qepfh;Z.1-6--- 0.06 ---- ---J---- --- ---- ---,-- y -------1----I----J-----I----i-------- 0.07: I I € t VI'�6,aO1 "II ffff I ..- -- -- 0.06 I - N -- 0,05Jm I I I E r I 5 0.04' f I I I I I I 1 I I 4 S I 3 I -1----L---J-__-L - - 3 I I I I I I I F S I I I 0' 5 6 7 II 9 10 11 12 13 14 15 1 117 16 19 20 Tune (hours) 212 Brentwood Circle_Postdevelopment Type /// 24-hr 25 yr Rainfall=6.00" Prepared by Sullivan Engineering Group, LLC Page 28 HydroCADO 7.00 sln 001433 O 1986-2003 Applied Microcomputer Systems 12127/2021 Subcatchment 2S_3: Remaining Land Runoff = 0,41 cfs @ 12.15 hrs, Volume= 1,413 cf, Depth= 1.52" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 25 yr Rainfall=6.00" Area (sf) CN Description 4,429 61 >75% Grass cover, Good, HSG B 6,756 55 Woods, Good, HSG B 11,185 57 Weighted Average- � Tc Length Slope Velocity Capacity Description min feet ft/ft ft/sec cfs 7.5 50 0.0100 0.1 Sheet Flow, Grass-. Short n= 0.150 P2= 3.10" 0.4 18 0.0100 0.7 Shallow Concentrated Flow, Short Grass Pasture Kv=7.0 fps 0.2 30 0.1000 2.2 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 1.0 44 0.0100 0.7 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 9.1 142 Total Subcatchment 2S_3: Remaining Land Hydrograph ( I ! I I I I I .._ .L...........E._ ..._..._I......_._3_, _... .- E 3 I E I I i f I ; R�!(1Off 0.44_ ----r---,----r--- ----r-- 0.41 cfs ----r---- r----t----7- ....... 0.42 ---- .._.........E....._...,_._.... ..3.._ ...,...i...._._ 0.4 ____L___1____L___J____L___J___ - —_J____L__ - e l _ - �, 1 I L I I ' �� 0.36 ---- - - Ra><infa11-6.44 -- 0.344 _..__L___!----L----k---'L--- -'--- <----'----I----I---�3----i----1---`I_ 0.32 --- ----'L----j----11---11--- -- - RUnoff Area:'I1-,,185Esf- , I I 0.28- J. -------- ---- - ---;Run off.;Volum 'i-,413;Cf- = ---- ---�---- ---�---- ---� - ino ff beth�-1.52 0.24 -r 3 0 22 = - -_--. Ru 0.2 ----L--- [ ----EI---- ---F1W-Lefith=142'. I 3g I 1 0.161 ----I ----I I I T_c'91�-YYIn . r----,----r--- I T -""P 0.14' ----! --- ! I _5 0.12: ----I-..._....�..,...-,-,s.....,-..a�. ...,.....L--..-..-....a__. r �__I____�____I____4____I____ _ E I i I I I 1 I E I I I 1 E I 0.08' ---- ---I----I----E----I---- 0.06- _L____S____L-.__J————L___J__ L 0.04W ---- --- ---- --- ---- ---�- t---- `, ,= F 0.02- I I v 0= 5 6 7 a 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 212 Brentwood Circle_Postdevelopment Type It/ 24-hr 25 yr Rainfall=6.40" Prepared by Sullivan Engineering Group, LLC Page 29 H droCAD®7.00 sln 001433 01986-2003 Applied Microcomputer Systems 12/27/2021 Pond 'I P: 8'Wx5'DCrushed Stone Infiltration Trench Field Percolation Rate of Soil = 12 MPI Design Rate=24 MPI Inflow Area = 6,801 sf, Inflow Depth = 3.75" for 25 yr event Inflow - 0,71 cfs @ 12.09 hrs, Volume= 2,123 of Outflow = 0.07 cfs @ 13.16 hrs, Volume= 1,279 of, Atten= 90%, Lag= 64.2 min Discarded = 0.03 cfs @ 10.90 hrs, Volume= 1,194 of Primary = 0.04 cfs @ 13.16 hrs, Volume= 86 of Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 104.20' @ 13.15 hrs Surf.Area= 544 sf Storage= 1,088 of Plug-Flow detention time= 175.3 min calculated for 1,275 cf(60% of inflow) Center-of-Mass det. time= 101.3 min ( 877.6 - 776.3 ) # Invert Avail.Stora e Storage Description 1 99,20' 1,088 cf 8.00'W x 68.00'L x 5.00'H Prismatoid 2,720 of Overall x 40.0% Voids # Routing Invert Outlet Devices 1 Discarded 0.00' 0.003470 fpm Exfiltration over entire Surface area 2 Primary 104.20' 5.00' x 20.00' Horiz.Top Stone Limited to weir flow C= 0.600 Discarded OutFlow Max=0.03 cfs @ 10.90 hrs HW=99.25' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.03 cfs) Primary OutFlow Max=0.00 cfs @ 13.16 hrs HW=104.20' (Free Discharge) I'-2=Top Stone (Weir Controls 0.00 cfs @ 0.1 fps) 212 Brentwood Circle_Postdevelopment Type 11124-hr 25 yr Rainfall=6.00" Prepared by Sullivan Engineering Group, LLC Page 30 H droCADO 7.00 sln 001433 © 1986-2003 Applied Microcomputer Systems 12/2712021 Pond 'l P. 8'Wx5'DCrushed Stone Infiltration Trench Hydrograph I 1 1 1 I 1 I I I 1 1 E ! ( 1 I I I 3 M Inflow 0.71 efs € I I 1 I I I El outflow -1----r----L...---I----�---r---r--.... t 1 I 1 ®Discar ded 6O' -Sf- �Primary __in liMArpa - I i ------------ {--- -- - �e v Q.7; r ' a __E e 104:2 a'- ass: r � .. _'----'----'----'---�.}...- --'-- ---'----E. � .. 1 0.6 ---_I_......I..---'- --'----'--- I. - '----'--- ---'----'--- ' --- r , ,' r � ] ' r r � I I I i I E 1 I I I 3 1 rL ' ' 3 1 I I 1 E I I I r I I ! I � E__ ...I. _I.. 0.0 cfs - ' 0.03 cf 0.1: 0.04 cfs 0.05= 0 ' 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 212 Brentwood Circle_Postdevelopment Type 1/124-hr 25 yr Ralnfa11=6.00" Prepared by Sullivan Engineering Group, LLC Page 33 HydroCADO 7.00 sln 001433 © 1986-2003 Applied Microcomputer Systems 12/27/2021 Link 1 L: Design Point 1 Inflow Area = 16,668 sf, Inflow Depth = 2.51" for 25 yr event Inflow - 1.14 cfs @ 12.11 hrs, Volume= 3,483 cf Primary 1.14 cfs @ 12.11 hrs, Volume= 3,483 cf, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Link 1 L: Design Point 1 Hydrograph I I I I I I I [ 1 1 E 1 I I I 13 Inflow 1 I E E I 1 1 I € I I I I I I E I I 1 I E I f3 Primary 1.14 cfs Jnf1Ow 'Area= 6,668 sf I I I 1 I I J J I I i 1 I I 1 f i E I I I E I I I I I I 1 E E I I I E I I 1 I I I ! € E I I I t I I I I I 1 ! E 1 I I I I I I I I I I E I 1 I I I y I I I I I I I I I ( I I I I I I I I I I I I 4 I I I 3 I I I I I I I I I I I I I Q I I I I I I I I I I I I I I I I I I I I I I I I I I I ! I I E I I I E I I I I I E I I I I I I I I I I I I E I I E I I I I I I I I I E E I ! I I I I I I I I I f I I E f ! I I I I I I I k I I E E I I I I 1 I I h I I E E I I I I I I I 1 I I E I I I I I I I I I € I I I I 1 I I I [ I /J Q 5 6 7 a 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 212 Brentwood Circle_Postdevelopment Type 11124-hr 25 yr Rain fall=6.00" Prepared by Sullivan Engineering Group, LL.0 Page 34 HydroCADO 7.00 sfn 001433 © 1986-2003 Applied Microcomputer Systems 12/27/2021 Link 2L: Design Point 2 Inflow Area = 20,558 sf, Inflow Depth = 0.89" for 25 yr event inflow = 0.41 cfs @ 12.15 hrs, Volume= 1,521 cf Primary 0.41 cfs @ 12.15 hrs, Volume= 1,521 cf, Atten= 0%,, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Link 2L: Design Point 2 Hydrograph I I 1 M Inflow 0.44: --- ----'----� -....I__......I_ L .... _.i._,__..i - _--- --- ----L--- El Primary r ! ! 1 I 0.41 Cf5 a 1 F L. I a.42 -..._; .... ....I.. ....- --- ----I- ---jnf1Ow�4rea-�20,-558-,M- r I L___ _..._...I... L. _ _ __ J L J _ 0.36. / ` I ! 0.34'=.= r I I I I I I I I I 3 I I I I E I I I I I I 7 I I # I I t I I 'ii I I ! I 7 I I F ;• i 1 I r I I I I € I 1 I I = ' , I 1 I I I I I ! I 1 0.24 --- --- ----r--- ----I----r --r---r--_-,__....L.,.._....t '--�----r--- 3 0.22= JFL ----'---- '-----'----I---- p . r a.1�:� • r-———i————I————i———7———--E--—-....�. � -'—1�--.._..r...._. ..._I.....--'--E——_—r———J————�——— 4.16 L- --J----L--- ----'- - L ----L----A----OA4 --- �' s a � ' 0.06: ' I 0.04 0.02 M r 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hovers) 212 Brentwood Circle_Postderrelopment Type lil 24-hr 25 yr Rainfall=6.00" Prepared by Sullivan Engineering Group, LLC Page 32 H droCADO 7.00 sln 001433 01986-2003 Applied Microcomputer Systems 12/2712021 Pond 2P: 4'Wx4'DCrushed Stone Infiltration Trench Hydrograph I I I E I I I I I I 1 Outflow --- ------ Discarded edI oIr� , y ,7 MPrlmary I I I E I ! I I --- ----,---- ------Peak-EMe_v=1-03.00'. _ __I__ _I_ I I I 1 - L, .. ., Sto ;ag ;Cr=230 cf- : r , i ----'---_I..... _._L.. .. ._._I.. ...,_' --'- - ---I----'---_'.. .. .....L.. �1 ... .....L.... --'----'---- Q.i2: I I 1 I E y -------------- 0.09: r• r • O Q,a$-' r 0:07 I I: r � 0.06 --'----'----+----'---- I I I I I I I 3 E I I I I r I 0.05: 0.02 cfs 0.04: r : I E I I 3 I r /r I• 0.a2: ' '' 0.01 cfs a 5 6 7 II 9 10 11 12 13 14 15 16 i7 1II 19 20 Time (hours) 212 Brentwood Circle Postdevelopment Type 11124-hr 25 yr Rainfall=5.00" Prepared by Sullivan Engineering Group, LLC Page 31 H droCADO 7.00 s/n 001433 01986-2003 Applied Microcomputer Systems 12/27/2021 Pond 2P: 4'Wx4'DCrushed Stone Infiltration Trench Field Percolation Rate of Soil = 12 MPI Design Rate= 24 MPI Inflow Area 2,572 sf, Inflow Depth = 2.16" for 25 yr event Inflow = 0.16 cfs @ 12.10 hrs, Volume= 463 cf Outflow 0.02 cfs @ 13.35 hrs, Volume= 290 cf, Atten= 87%, Lag= 75.2 min Discarded = 0.01 cfs @ 11.60 hrs, Volume= 269 cf Primary - 0.01 cfs @ 13.35 hrs, Volume= 22 cf Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Eiev= 103.00' @ 13.35 hrs Surf.Area= 144 sf Storage= 230 cf Plug-Flow detention time= 193.8 min calculated for 290 cf(63% of inflow) Center-of-Mass det. time= 115.8 min ( 925.1 - 809.4 ) # Invert Avall.Stora e Storage Description 1 99.00, 230 cf 4.00'W x 36.00'L x 4.00'H Prismatoid 576 cf Overall x 40.0%Voids # Routing Invert Outlet Devices 1 Discarded 0,00' 0.003472 fpm Exfiltration over entire Surface area 2 Primary 103.00' 2.00' x 18.00' Horiz.Top Stone Limited to weir flow C= 0.600 1�3iscarded OutFlow Max=0.01 cfs @ 11.60 hrs HW=99.04' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.01 cfs) Primary OutFlow Max=0.00 cfs @ 13.35 hrs HW=103.00' (Free Discharge) L2=Top Stone (Weir Controls 0.00 cfs @ 0.1 fps) 212 Brentwood Circle_Postdevelopment Type i1124-hr 100 yr Rainfall=8.60" Prepared by Sullivan Engineering Group, LLC Page 35 H droCADV 7,00 sln 001433 © 1986-2003 Applied Microcomputer Systems 12/27/2021 Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points Runoff by SCS TR-20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 1S: Runoff Area=16,668 sf Runoff Depth=4.54" Flow Length=175' Tc=7.2 min CN=69 Runoff=2.07 cfs 6,303 of Subcatchment 2S_'f: Runoff Area=6,801 sf Runoff Depth=6.07" Tc=6.0 min CN=82 Runoff=1.12 cfs 3,441 of Subcatchment 2S 2: Runoff Area=2,572 sf Runoff Depth=4.07" Tc=6.0 min CN=65 Runoff=0.30 cfs 873 of Subcatchment 2S_3: Remaining Land Runoff Area=11,185 sf Runoff Depth=3.16" Flow Length=142' Tc=9.1 min CN=57 Runoff=0.89 cfs 2,943 of Pond 1P: 8'Wx5'DCrushed Stone Infiltration Peak Elev=104.22' Storage=1,088 of Inflow=1.12 cfs 3,441 of Discarded=0.03 cfs 1,344 of Primary=0.86 cfs 1,130 of Outflow=0.89 cfs 2,475 of Pond 2P: 4'Wx4'DCrushed Stone Infiltration TrePeak Elev=103.01' Storage=230 of Inflow=0.30 cfs 873 of Discarded=0.01 cfs 302 of Primary=0.26 cfs 360 of Outflow=0.26 cfs 662 of Link 1 L: Design Point 1 Inflow=2.07 cfs 6,303 cf Primary=2.07 cfs 6,303 cf Link 2L: Design Point 2 Inflow=1.98 cfs 4,433 of Primary=1.98 cfs 4,433 cf Total Runoff Area = 37,226 sf Runoff Volume = 13,560 cf Average Runoff Depth = 4.37" 212 Brentwood Circle_Postdevelopment Type 1!I 24-hr 100 yr Rainfall=8.60" Prepared by Sullivan Engineering Group, LLC Page 36 HydroCADO 7.00 s/n 0014.33 O 1986-2003 Applied Microcomputer Systems 12/27/2021 Subcatchment 1S: Runoff - 2.07 cfs @ 12.11 hrs, Volume= 6,303 cf, Depth= 4.54" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 100 yr Rainfall=8.60" Area sf CN Description 1,128 98 Portion of Roof House 395 98 Walkway 1,918 98 paved driveway 13,227_ 61 >75% Grass cover, Good, HSG B 16,668 69 Weighted Average Tc Length Slope Velocity Capacity Description min feet ftlft ft]sec cfs 6.4 41 0.0100 0.1 Sheet Flow, Grass: Short n= 0.150 P2= 3.10" 0.2 72 0.0600 5.0 Shallow Concentrated Flow, Paved Kv= 20.3 fps 0.6 62 0.0600 1.7 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 7.2 175 Total Subcatchment 1S: Hydrograph I I I E F 1 I I I I I 3 I I I F F 1 ! I E I ! I 1 I I I I F 1 i I I I �RU(loff 2.07 cfs Type 24-hr �I OO;yr I E f I I I I 1 1 I 1 I I > Rainfallr8.60 I I I I I I I I I I I I E Runoff Area'16;668;sf I I I ! I I ( I 1 , I I I ;Ru noff;VOIlU M Y=6,;303; cf y I 3 I I I I I I I I I 1 l� Runoff Dapth�4.54 3 I I 1 1 [ I I I I I I I I ---- --- ----�- __,.._..... f----I-- ---r----I.-......I*lo►ni LbbglAl=175' I 1 I I I I I I I E I _7F2 "C I [�yl ln I I 1 i 1 t I TIC-- I I I I I i I lj N 469 t I I I I I i I I 1 1 I I I 1 I I I 1 I I I 1 I E E I I I I I I I I I 1 I I f x I I I I I I I I 1 I I 3 I I I 1 I I I I I 3 I I I 3 I I I I I I I I 1 I I I 1 • I I I I I � I ��' �'z I I I 1 n 5 6 7 8 9 10 11 1'2 13 14 15 16 17 16 19 20 Time (hours) 212 Brentwood Circle Postdevelopment Type Ill 24-hr 100 yr Rainfall=8.60" Prepared by Sullivan Engineering Group, LLC Page 37 H droCAD®7.00 sln 001433 01986-2003 Applied Microcom uter Systems 12/27/2021 Subcatchment 2S 1: Runoff = 1.12 cfs @ 12.09 hrs, Volume= 3,441 cf, Depth= 6.07" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 100 yr Rainfall=8.60" Area sf CN Description 1,064 98 Pool and Patio Area 1,186 98 Portion of Ex. House Roof 1,524 98 Ex. Rear patio 3,027 61 >75% Grass cover, Good HSG B 6,801 82 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ftlft) (ftisec) (cfs) 6.0 Direct Entry, Direct Subcatchment 2S 1: Hydrograph I I E I 1 I ! 3 I I I I E 3 I I E I I I k 3 I I E 3 I I I I ! E E i E I 1.12 cfs Type III 24-hr II100;yr t 3 Rainfall-8.60" I f I E I E I 1 I I E t 3 Runoff Are.1=6,8013 0 I k ! E I E E 1 I I I I I I h i E I E 1 3 ff;I VO IM I i41 i ;Ru rto =3,,411 cf I I ! E I ! f 1 I I I ! I Runoff De'pth76.07I " 3 E I 1 E I I I 1 I I I 3 T'c=6',0 rain E E i E I I 3 I 6N=-I82 E I i I I f I 3 I I I I I I ! E I E I 3 I I I E I ! I ! E I E I 3 I I I k I E I I E I E I 1 I I I ! I I I E I E I I i I I I E I k I I E I E I I 1 I I 1 k I l I i E I E I I 3 I I I E I I I I I I E I I 1 I I E I I I I I I I I i 1 I I E E I I I I I I I I 3 I I E I I I I I I I I E I I � .M fl- 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Thne (hours) 212 Brentwood Circle_Posfidevelopment Type 11124-hr 100 yr Rainfall=8.60" Prepared by Sullivan Engineering Group, LLC Page 38 HydroCADO 7.00 s/n 001433 0 1986-2003 Applied Microcomputer Systems 12/27/2021 Subcatchment 2S 2: Runoff = 0.30 cfs @ 12.09 hrs, Volume= 873 cf, Depth= 4.07" Runoff by SOS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 100 yr Rainfall=8.60" Area (sf) ON Description 288 98 Shed Roof 2,284 61 >75% Grass cover, Good, HSG B 2,572 65 Weighted Average Te Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/-sec) _- (cfs) 6.0 Direct Entry, direct Subcatchment 2S 2: Hydrograph I 1 I i I I 0.32: • I 1 I I 0.30 cfs -;----;----;----;----;----; -.-._ .. I I ----- - ,- ,..--TyP6-111,24-hr 100-' ----J-----1----L----1----1----'---- y D.26? I I __' _R.#-i nfa.11;8..6-0y 0.24- Run-offArea=2-67TSf-. Q.ZZ- J i 1____3____ e ._... _ Uf10 ,- o Uni0— 7 -IG -- -� I I I 0 0.18- -- Runbff- 60th�4�0? 0.14- 1 t j I �I�� D.12- I 1 I I I I I 3 1 1 I I 1 I 3 I 0.04- I x I 0.02' J < f n :14 .+' J".nt %/ JY"�'�� r D- 5 6 7 8 9 iG 11 12 13 14 15 16 17 18 19 20 Time (hours) 212 Brentwood Circle Postdevelopment Type 11124-hr 100 yr Rainfall=8.60" Prepared by Sullivan Engineering Group, LLC Page 39 HydmCAD®7.00 sin 001433 © 1986-2003 Applied Microcomputer Systems 12/27/2021 Subcatchment 2S_3: Remaining Land Runoff _ 0.89 cfs @ 12.14 hrs, Volume= 2,943 cf, Depth= 3.16" Runoff by SCS TR-20 method, UH=SCS, Time Span 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 100 yr Rainfall=8.60" Area sf CN Description 4,429 61 >75% Grass cover, Good, HSG B 6,756 55 Woods Good HSG B 11,185 57 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ftlft) (ftlsec) (cfs) 7.5 50 0.0100 0.1 Sheet Flow, -- Grass: Short n= 0.150 P2= 3.10" 0.4 18 0.0100 0.7 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 0.2 30 0.1000 2.2 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 1.0 44 0.0100 0.7 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 9.1 142 Total Subcatchment 2S_3; Remaining Land Hydrograph I E f I I I 1 ! 1 1 t ! �f2UilOff 0.89 cfs Type III 24-h r ;1 00:yr I E i 7 I I 1 t I RI I I 3 E ainfa11lf8.60" I 1 3 3 I I I E I I I f I 3 RlunoIff Area! I=11sl I 185E sf E Run off: U MT VO 2j`943:Cf I E I I I I I I 1 l I E Runoff Depth=3.1E6" F Flow Lehgth=142' I I i I I I I 1 I I ? I i I I I I E T' =931 t*n I ! I I I 1 E I 1 ! ! I 1 I I 1 1 bN='57 ! I ! I I I I I I 1 I 1 1 E I I I I I I I 1 I 1 I I I I ! I I 1 I I ! 3 I I { I I I I I I t I I ! 3 I I 1 I I I I I i I I 3 I I f I I I I I i I I I 3 I I I 1 I I I I I I 3 I 0 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 212 Brentwood Circle_Postdevelopment Type I// 24-hr 100 yr Rainfall=8.60" Prepared by Sullivan Engineering Group, LLC Page 40 H droGADO 7.00 s/n 001433 OO 1986-2003 Applied Microcom uter Systems 12/27/2021 Pond 1 P: 8'Wx5'DCrushed Stone Infiltration Trench Field Percolation Rate of Soil = 12 MPI Design Rate=24 MPI Inflow Area = 6,801 sf, Inflow Depth 6.07" for 100 yr event Inflow - 1.12 cfs @ 12.09 hrs, Volume= 3,441 of Outflow - 0.89 cfs @ 12.17 hrs, Volume= 2,475 of, Atten= 20%, Lag= 4.8 min Discarded = 0.03 cfs @ 9.75 hrs, Volume= 1,344 cf Primary = 0.86 cfs @ 12.17 hrs, Volume= 1,130 of Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 104.22' @ 12.15 hrs Surf.Area= 544 sf Storage= 1,088 of Plug-Flow detention time= 107.7 min calculated for 2,475 cf(72% of inflow) Center-of-Mass det. time= 43.5 min ( 808.2 - 764.8 ) ## Invert Avail.Stora e Storage Description 1 99.2D' 1,088 of 8.00'W x 68.00'L x 5.00'H Prismatoid 2,720 of Overall x 40.0% Voids # Routing Invert Outlet Devices 1 Discarded 0.00' 0.003470 on Exfiltrati over f m e p � entire Surface area 2 Primary 104.20' 5.00' x 20.00' Horiz, Top Stone Limited to weir flow C= 0.600 Qiscarded Outflow Max=0.03 cfs @ 9.75 hrs HW=99.25' (Free Discharge) 'F-1=Exflltratlon (Exfiltration Controls 0.03 cfs) Primary Outflow Max=0.48 cfs @ 12.17 hrs HW=104.22' (Free Discharge) L2=Top Stone (Weir Controls 0.48 cfs @ 0.5 fps) I 212 Brentwood Circle Postdevelopment Type !!! 24-hr 100 yr Rainfall=8.60" Prepared by Sullivan Engineering Group, LLC Page 41 HydroCAD®7.00 sln 001433 © 1986-2003 Applied Microcomputer Systems - 12/27/2021 Pond 1 P: B'Wx5'DCrushed Stone Infiltration Trench Hydrograph I i I I E I I I I I f I I I I I Inflow I , I 1. i 2 cfs I I E 1 I �y uMOW O I I h I I I I 3 I 11 ®DIscarded I I f I I 1lnflo►n� Area-4V,801 S - p primary -- - s' I I I I I 3 I I 31e��1 4.2;2 Peak E ' 3 I-0a9 cfs l ; Stbraoe-11 ,088 cf 1 I E I 0.86 cfs E I E I E I I € f I I I I E I I I E I I € I I I I ! € I I I E I 1 € f I I I 1 i I I I I I 1 E i I E tl I I I I I I I I F f I I I 3 I I I I I I I I F E I I I O I f I I E I I I ! f I I I LL I E I I € € 1 S I I I I I k I I E I I € I I I I ! I I f I I F I I I I I I I I I I I Z I I { I I I 1 I I I F I I E I I I I I I E I I E I I I i I I I 0.03 cfs isliggIIIII I, IMI - 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 212 Brentwood Circle_Postdevelopment Type 11124-hr 100 yr Rainfall=8.60" Prepared by Sullivan Engineering Group, LLC Page 42 HydroCADO 7.00 sln_001433 OO 1986-2003 Applied Microcomputer Systems 12/27/2021 Pond 2P: Mx4'DCrushed Stone Infiltration Trench Field Percolation Rate of Soil = 12 MPI Design Rate= 24 MPI Inflow Area = 2,572 sf, Inflow Depth = 4.07" for 100 yr event Inflow = 0.30 cfs @ 12.09 hrs, Volume= 873 cf Outflow -- 0.26 cfs @ 12.16 hrs, Volume= 662 cf, Atten= 11%, Lag= 4.1 min Discarded = 0.01 cfs @ 10.80 hrs, Volume= 302 cf Primary = 0.26 cfs @ 12.16 hrs, Volume= 360 cf Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 103.01' @ 12.15 hrs Surf.Area= 144 sf Storage= 230 cf Plug-Flow detention time= 97.3 min calculated for 659 cf(75% of inflow) Center-of-Mass det. time= 37.8 min ( 833.0 - 795.2 ) # Invert Avall.Storage Storage Description 1 99.00, 230 cf 4.00'W x 36,00'L x 4.00'H Prismatoid 576 cf Overall x 40.0% Voids _# Routing Invert Outlet Devices _ 1 Discarded 0.00' 0.003472 fpm Exfiltration over entire..Surface area 2 Primary 103.00' 2.00' x 18.00' Horiz. Top Stone Limited to weir flow C= 0.600 ?scarded OutFlow Max=0.01 cfs @ 10.80 hrs HW=99.04' (Free Discharge) 1=Exf1ltration (Exfiltration Controls 0.01 cfs) Primary OutFlow Max=0.10 cfs @ 12.16 hrs HW=103.01' (Free Discharge) 't-2=Top Stone (Weir Controls 0.10 cfs @ 0.3 fps) 212 Brentwood Circle_Postdevelopment Type 11124-hr 100 yr Rainfall=8.60" Prepared by Sullivan Engineering Group, LLC Page 43 HydmCAD®7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems 12/27/2021 Pond 2P; 4'Wx4'DCrushed Stone Infiltration Trench Hydrograph E I I I I I f ! I I I I I I I I I I i 0,30cfS In"'W l. ---'----'----'----'----I-- -'----' ___'--------I---- ---I----. -- L ouo ®Discw - ard edinfiow3A-r6a#2 -57 2-sf-- Primary , r- L , K 0.260.32 _. dea -EMev=' 03.41 -_ 0.28. 0.26 cfs ,- -- ------ --- - C I _tor`ag =_2 _0__ f . 0.26_ ----- - ------ I I I 3 I 4 I I k 0.22i ----,------------I----I- -----------k-------- ---t---I---- r r f I I I 3 I l I I ! h 0.2'. .----,----,--_- ---,---- ---k----;---i---,----1_ - - I I 1 1 I I f I I ! I---- 0.16, . r u 0.14. !� I I I I I 1 ! I 3 I I V.12- ____I____I____I____1____I_ _I____r___I________E____�___E____ f,r I I 1 1 I I f I I k l ----I----I----I----3----I -I ---1----i----I----1----k----k---- r I I I 3 ! I f I I k I I I I I ! 0.06- 0.04 0.01 Cf o,oz= o 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (!tours) 212 Brentwood Circle_Postdevelopment Type 11124-hr 100 yr Rainfall=8.60" Prepared by Sullivan Engineering Group, L.L.0 Page 44 HydroCADO 7.00 sin 001433 © 1986-2003 Applied Microcomputer Systems 12/27/2021 Link 9 L: Design Point 1 Inflow Area = 16,668 sf, Inflow Depth = 4.54" for 100 yr event Inflow = 2.07 cfs @ 12.11 hrs, Volume= 6,303 cf Primary — 2.07 cfs @ 12.11 hrs, Volume= 6,303 cf, Atten= 0%, L.ag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Link I L: Design Point 9 Hydrograph t F I I I i I i 1 F I 1 I I I I I 13 inflow M Primary _.,.._.._.......... ......--I- 2.07 cfs -- ----� -- ---- �-- II �nfl'ow �►rea='�-6��68 sf-- 2- { I 3 3 1 I E I I I I I € i I 1 I I I k I I I I I k I I 1 I I I I I I I f i I i I I I 1 1 I I I t I I 1 I I I I 1 I I I ! I I ! I I I I 3 I I I ! I I I I ! I I I I I I E I I I I E I I I I I S N I I I I I I I I I I 1 I 7 I E I I I I I I I 1 I ! I k I I I E ! I I I I I I Q I k I I I E 3 I I ! I I I I I E F I I I I I E I f I E I E i I 1 I I I E I I I 1 I { I I I I I E ! I I I I I I I I I 1 # I I 1 t I I I E I I I # I I { ! I I I f I I I # I I { I I I I I I I p I I 3 I I I 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 212 Brentwood Circle_Postdevelopment Type 11124-hr 100 yr Rainfall=8.60" Prepared by Sullivan Engineering Group, LLC Page 45 HydroCADQ 7.00 sln 001433 © 1986-2003 Applied Microcomputer Systems 12/27/2021 Link 2L: Design Point 2 Inflow Area = 20,558 sf, Inflow Depth = 2.59" for 100 yr event Inflow — 1.98 cfs @ 12.16 hrs, Volume= 4,433 cf Primary — 1.98 cfs @ 12.16 hrs, Volume 4,433 cf, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Link 2L: Design Point 2 Hydrograph I I I I f I 3 I I I 1 I I 3 I k w I i I I I I I I i I E I I I I I I I I 3 I I E I ! € ! I 1.98 cfs I I I I Inflow ;Area=20,558 sf I 3 1 I I ! I I I ! I I f I I I I I t I I I i I I I I I I I I E I I I I ! I [ I ! I I I ! I I I I I ! I I E I E I ! I I I I 1 I f E I I E I f I I I I i E I E I I I I I I I I I i E I E I I v E I 1 I I I I I I I I E I 3 E I I I I I I I I I I E I SIR p f I 1 I I I I I I I I E I E I I I I I I I I I I € I t I I I € I I I I I I € I I I I I ! I I I I I I E I 1 I I E I I I I I I € I I 1 I I E 1 I I I € I € I I I I I f 7 I I I € I € I I I I I ! I ! ( € I I I I I I I f i I I I I I E I I 1 I I I I I I I E f I ( I I I I E k y., 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Tyne (Fours) 212 Brentwood Circle_Postdevelopment Type 1/124-hr half inch event Rainfall=0.50" Prepared by Sullivan Engineering Group, LLC Page 46 HydroCADO 7.00 sln 001433 ©1986r2003 Applied Microcomputer Systems 12/27/2021 Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points Runoff by SCS TR-20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 1S: Runoff Area=16,668 sf Runoff Depth=0.00" Flow Length=175' Tc=7.2 min CN=69 Runoff=0.00 cfs 0 of Subcatchment 2S_1: Runoff Area=6,801 sf Runoff Depth=0.00" To=6.0 min CN=82 Runoff=0.00 cfs 0 of Subcatchment 2S-2: Runoff Area=2,572 sf Runoff Depth=0.00" Tc=6.0 min CN=65 Runoff=0.00 cfs 0 of Subcatchment 2S-3: Remaining Land Runoff Area=11,185 sf Runoff Depth=0.00" Flow Length=142' Tc=9.1 min CN=57 Runoff=0.00 cfs 0 of Pond: 1 P: 8'Wx5'DCrushed Stone Infiltration Trench Peak Elev=99.20' Storage=0 of lnflow=0.00 cfs 0 of Discarded=0.00 cfs 0 of Primary=0.00 cfs 0 of Outflow=0.00 cfs 0 of Pond 2P: 4'Wx4'DCrushed Stone Infiltration Trench Peak Elev=99.00' Storage=0 of Inflow=0.00 cfs 0 of Discarded=0.00 cfs 0 of Primary=0.00 cfs 0 of Outflow=0.00 cfs 0 of Link 1 L: Design Point 1 Inflow=0.00 cfs 0 of Primary=0.00 cfs 0 of Link 2L: Design Point 2 Inflow=0.00 cfs 0 of Primary=0.00 cfs 0 of Total Runoff Area = 37,226 sf Runoff Volume = 0 cf Average Runoff Depth = 0.00" 212 Brentwood Circle_Postdevelopment Type IIl 24-hr half inch event Rainfall=0.50" Prepared by Sullivan Engineering Group, LLC Page 47 H droCAD®7.00 s/n 001433 © 1986-2003 Applied Microcarn uter S stems 12/27/2021 Subcatchment 1S: Runoff = 0.00 cfs @ 5.00 hrs, Volume= 0 cf, Depth= 0.00" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr half inch event Rainfall=0.50" Area sf CN Description 1,128 98 Portion of Roof House 395 98 Walkway 1,918 98 paved driveway 13,227 61 >75% Grass cover, Good, HSG B 16,668 69 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ftlft) (ftlsec) (cfs) 6.4 41 0.0100 0.1 Sheet Flow, Grass: Short n= 0.150 P2= 3.10" 0.2 72 0.0600 5.0 Shallow Concentrated Flow, Paved Kv= 20.3 fps 0.6 62 0.0600 1.7 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 7.2 175 Total Subcatchment 1 S: Hydrograph I I I I I I I I m I f I 3 I f I 1 I I € 1 I I I f I i t I I I I I 1 I I I I I I I f I I I I I I I I Type III 24-hr half inch event { F Rainfall=0.50" I i I I 1 k I 1 I I 1 I I I } t Runoff Are6=16,66$ Sf I 1 I I 3 kunoff VolumIe=0 cf f 3 I I I f I I I I I I i I 3 Runoff Depth, =0.00" I I I I 1 I I I 1 I I 1 I Flow L;eng�h=175' LL I 3 I 1 I 3 I i I 1 I I I 1 I 1 I I I I I 1 ITc— .2 min CN�69 I I 1 I I i I I I I I E I "'!' I I I I I I I I I I I ! I I I I I I I i I I I I I E I I I I I I I I I I I I I E I I I I I I I ! I I I I I E I I I I I I I I I I I I I € I I I I I I I i I I I I I E I I I I I I I I I I I E I € I I I I I I E I I I I f I € I I I I I I E I I I I I I E 1 I I I I 1 f I I I I I I E I I 0.00 cfS I 5 6 7 8 9 Jb 11 12 13 14 15 16 17 18 19 20 Time (hours) 212 Brentwood Circle_Postdevelopment Type M 24-hr half inch event Rainfall=0.50" Prepared by Sullivan Engineering Group, LLC Page 48 H droCAD®7.00 sln 001433 OO 1986-2003 Applied Microcomputer Systems 12/27/2021 Subcatchment 2S 1: Runoff = 0.00 cfs @ 20.00 hrs, Volume= 0 cf, Depth= 0.00" Runoff by SCS TR-20 method, UH=SCS, Time Spam 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr half inch event Rainfall=0.5011 Area (sf) CN Description 1,064 98 Pool and Patio Area 1,186 98 Portion of Ex. House Roof 1,524 98 Ex. Rear patio _3_,027 _ 61 >75% Grass cover, Good, HSG B 6,801 82 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ftlft) (ftlsec) (cfs) 6.0 Direct., ,, ,Entry, _ E Direct Subcatchment 2S 1: Hydrograph I I I I I { I I I I I I I I 3 I I E f 1 I ---- . ,• II T 1I F I - 14 Runoff °- ____ ___1 ____E ___f ___I ____I ___ ___! 1 E 1 I I ! l r I I _...._„ .�..............�...._-......�.._._. 0.00 Cf S Type 111-24=nr-h-Olf--inGh-event;._. . .., _ - -- - ° ----------------- 0 '. _ Rainfall_=0.60_'__' - ---- 1 € I I I I I I I ___II_--__-_- I `_-_-_-_I-_-_-_-_ -----I_--_-_-_{-__-_-I I-------�-I ---- RunoffArea=6 01-sf--- --__- _ 0: • ---- ``--``- _-`------ IOC 1 - € - - L I 0: Runoff1Volume I! ------- • r I I I E 3 .H. ° h0;00"3 -;-- --- I -- I E -Ruiff:De 0 -- o � --- - -{---- --- ---- O GNr+82 3 I I -1----4----r--- -------- - ' ___-r--_-t___- I E { I I I I I E I I I I F 0 ' 1 I { I 1 I I I 1 ---- 0 0- y 5 6 7 II S 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 212 Brentwood Circle_Postdevelopment Type 11124-hr half inch event Rainfall=0.50" Prepared by Sullivan Engineering Group, LLC Page 49 HydroCAD®7.00 sln 001433 ©1986-2003 Applied Microcomputer Systems 12/27/2021 Subcatchment 2S 2: Runoff 0.00 cfs @ 5.00 hrs, Volume= 0 cf, Depth= 0.00" Runoff by SCS TR-20 method, UH=SCS, Time Span 5.00-20.00 hrs, dt= 0.05 hrs Type Ill 24-hr half inch event Rainfatl=0.50" Area (sf) CN Description 288 98 Shed Roof 2,284 61 >75% Grass cover, Good HSG B 2,572 65 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ftlft) (ftlsec) (cfs) _ 6.0 Direct Entry, direct Subcatchment 2S 2: Hydrograph E I I ! ! I ! I [ I I I I I I 1 I I I E I �"llnofF I [ I I I I I I [ ! I I I I Type III 24-hr half inch event I ! I I I I I E h I I I € I I I I E 4 I I Ralnfal'1-0.019 I E I I I I E 1 I I I E Runoff Area=2,572 sf I E I I I I I I I 1yy.� I �J),I 3y'� I �1 rr I E I I I I I � unoff ,Olu M: e=6 c I i i I I I I I I I I I i i I E I I I I I 1 I 1 3 I ! 1 1 I I 1 1 Runoff epth=0, 0" UI E i I I I I 1 I I I I I I I`Tc=6.0 min 3 I ! I 1 I I I I 1 I I LL p I E I € I I I I t I I I I II I E I I I I I i I 1 CN^65 I ! 3 I I I I € I i I E ! I I I I I E I I I 5 I I ! 3 ! I I I I E I I I 1 I I ! 3 I I f I I € I I I 1 I I E 3 I I I I I I I I I I I I I 3 I I I I I I 1 I I I 1 I ! ! I I I I I I 1 I I I E I E I I I I E I I I I I I E I ! 3 I I ! E I I 1 I I I E 0.00 cfs. I �r 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (Fours) 212 Brentwood Circle Postdevelopment Type Ill 24-hr half inch event Rainfall=0.50" Prepared by Sullivan Engineering Group, LLC Page 50 H droCADO 7.00 sln 001433 © 1986-2003 Applied Microcomputer Systems 12/27/2021 Subcatchment 2S-3: Remaining Land Runoff = 0.00 cfs @ 5.00 hrs, Volume= 0 cf, Depth= 0.00" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr half inch event Rainfall=0.50" Area sf CN Description 4,429 61 >75% Grass cover, Good, HSG B 6,756 55 Woods Good HSG B 11,185 57 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ftlft) (ftlsec) (cfs) 7.5 50 0.0100 0.1 Sheet Flow, Grass: Short n= 0.150 P2= 3.10" 0.4 18 0.0100 0.7 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 0.2 30 0.1000 2.2 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 1.0 44 0.0100 0.7 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 9.1 142 Total Subcatchment 2S_3: Remaining Land Hydrograph I I k I 1 1 I I 1 1 I I I I 1 1 I 1 I I �RI1ROff I I I 1 I I I I I I I I I I I I I 1 I I I I I I I I I I Type III 24-hr half inch event 1 I I I i I I I I I I I I 3 I Rainfal'14.60" 3 1 I I I I I I E I i I I E I I I I I I 1 I I I 1 I i I I I I 1 IRS •J,•1� •`' ij� �+ I I I { I I I 1 Runoff AreG= 1 1 18V sf I I I E I I I I € I I E� I I I I E I I ! E I E E 1 � unoff Volume=0 cf I I I i I I E I I 1 I I i I I I I i I E E E I f I Runoff Depth=0.00" U I I E i I I E I E I I I 7 I 3 E E Flow Length=l 42' I � I I I ! I I € I 1 1 I I I I Tc=9.'1 m i n 3 CN"57 I I E I I I 3 I i 1 I I I i I I f I I } I 1 I I I I I I I f I I } I I I I I I I I I f I I I I E I I I f I I I E 3 I 3 I I I 3 I I I I f 3 3 1 I 3 I I 1 I I I I f 1 1 I 3 I I i I I I I I 1 I I 3 I I I I I I Ll.L1V Cfs ' I I I I 3 I I I I I I I 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Thne (hours) 1 212 Brentwood Circle_Postdevelopment Type 11124-hr half inch event Rainfall=0.50" Prepared by Sullivan Engineering Group, LLC Page 51 HydroCAD®7.00 sln 001433 (D 1986-2003 Applied Microcomputer Systems 12/27/2021 Pond 1 P: Mx5'Mrushed Stone Infiltration Trench Field Percolation Rate of Soil = 12 MPI Design Rate=24 MPI Inflow Area = 6,801 sf, Inflow Depth = 0.00" for half inch event event Inflow - 0.00 cfs @ 20.00 hrs, Volume= 0 of Outflow = 0.00 cfs @ 20.00 hrs, Volume= 0 of, Atten= 1%, Lag= 0.0 min Discarded = 0.00 cfs @ 20.00 hrs, Volume= 0 of Primary = 0.00 cfs @ 5.00 hrs, Volume= 0 cf Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 99.20' @ 20.00 hrs Surf.Area= 544 sf Storage= 0 of Plug-Flow detention time= 5.7 min calculated for 0 of(97% of inflow) Center-of-Mass det. time= 2.4 min ( 1,101.7 - 1,099.3 ) # Invert Avail.Stora e Storage Description 1 99.20' 1,088 cf 8.00'W x 68.00'L x 5.00'H Prismatoid 2,720 of Overall x 40.0% Voids # Routing Invert Outlet Devices 1 Discarded 0.00' 0.003470 fpm Exfiltration over entire Surface area 2 Primary 104.20' 5.00' x 20.00' Horiz. Top Stone Limited to weir flow C= 0.600 Qiscarded Outl=low Max=0.03 cfs @ 20.00 hrs HW=99.20' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.03 cfs) Primary OutFlow Max=0.00 cfs @ 5.00 hrs HW=99.20' (Free Discharge) t-2=Top Stone ( Controls 0.00 cfs) 212 Brentwood Circle_Postdevelopment Type 11124-hr half inch event Rainfall=0.50" Prepared by Sullivan Engineering Group, LLC Page 52 H droCADO 7.00 s1n 001433 © 1986-2003 Applied Microcomputer Systems 12/27/2021 Pond 1 P: 8'Wx5'DCrushed Stone Infiltration Trench aydrograph I i I I I E I I 1 I ------------ E I i 1 i I I I I f 1 ®inflow __L _1_ J__ J _ 31t o _ hfloW-Arrea=6' 80'� s-f I]�soarded . r r - --r -- - -- 0.00 cfs 0 Primary I = ,--Peak E�eu-*9�J�20.,. - -- r---I------------ ----I- f • ` I I I I I I I I I I i I I O: - --------- - -;-------------i - r_ .,._...L. . - __-�_ -,----,---- 0 Stor-age.0;cf. .:.. ....:.......:----;----;----;-- --- ---;---; . rr r r ' --- - ^ O"] 1---J---J - - r - • I I I I I I I I ( ! I I I r I I E I I 1 l I EL r • I I I I I 1 1 I I 3 1 3 I O: L___L___L___1___J___J_ --J_- O - I I I 9 1 I I I I I I -- O 0.00 cfs ' 5 6 7 a 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 212 Brentwood Circle Postdevelopment Type 11124-hr half inch event Rainfall=0.50" Prepared by Sullivan Engineering Group, LLC Page 53 HydroCAD®7.00 sln 001433 © 1986-2003 Applied Microcomputer Systems 12/27/2021 Pond 2P: MA'Mrushed Stone Infiltration Trench Field Percolation Rate of Soil = 12 MPI Design Rate= 24 MPI Inflow Area = 2,572 sf, Inflow Depth = 0.00" for half inch event event Inflow - 0.00 cfs @ 5.00 hrs, Volume= 0 cf Outflow - 0.00 cfs @ 5.00 firs, Volume= 0 cf, Atten= 0%, Lag= 0.0 min Discarded = 0.00 cfs @ 5.00 hrs, Volume= 0 cf Primary = 0.00 cfs @ 5.00 hrs, Volume= 0 cf Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 99.00' @ 5.00 hrs Surf.Area= 144 sf Storage= 0 cf Plug-Flow detention time= (not calculated) Center-of-Mass det. time= (not calculated) # Invert Avail.Stora e Storage Description 1 99.00' 230 cf 4.00'W x 36.00'L x 4.00'H Prismatoid 576 cf Overall x 40.0% Voids # Routing Invert Outlet Devices 1 Discarded 0.00' 0A03472 fpm Exfiltration over entire Surface area 2 Primary 103.00' 2.00' x 18.00' Horiz. Top Stone Limited to weir flow C= 0.600 Qiscarded OutFlow Max=0.00 cfs @ 5.00 hrs HW=99.00' (Free Discharge) T---1-Exfiltration (Passes 0.00 cfs of 0.01 cfs potential flow) Primary OufFlow Max=0.00 cfs @ 5.00 hrs HW=99.00' (Free Discharge) 1�--2=Top Stone ( Controls 0.00 cfs) 212 Brentwood Circle_Postdevelopment Type H/ 24-hr half inch event Rainfall=0.50" Prepared by Sullivan Engineering Group, LLC Page 54 HydroCADO 7.00 sln 001433 © 1986-2003 Applied Microcomputer Systems 12127/2021 Pond 2P: 4'Wx4"DCrushed Stone Infiltration Trench Hydrograph I I { I EM 1 I I E I I I I I 1 i I I 1 € € E I ! ! 3 1 I I Inf OW Q OUIROW -. ®Dli carded Inflow Area-,2,5�72 Sf Primary I I i I I I 3 I I 1 I € Peak Oev, =09.00" 3 3 E Stortige --0 d I I 3 i I I t I E E I I I i € I I I I I I I I I I I ! ! E I I I I I I I I F I 1 f 3 W E I I I I I I 1 1 3 I I i E I 3 I I 1 I I 1 S I I I I € I 3 I I 3 I I 1 I I I I I d € I I I I I I I 1 S I I I I 3 E E I I I I I I 3 I I i I 3 E E I I I I I I I I I I I I € E I I I I I 1 3 I 1 I I i E E I 1 I I I I 3 I I I I I € € I I I I I I ! I I I I I'1 1.n fln. fp 0-00 cfs 0- F 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 212 Brentwood Circle_Postdevelopment Type 11124-hr half inch event Rainfall=0.50" Prepared by Sullivan Engineering Group, LLC Page 55 H droCAD®7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems 1 212 7/2 02 1 Link 1 L: Design Point 1 Inflow Area 16,668 sf, Inflow Depth = 0.00" for half inch event event Inflow — 0.00 cfs @ 5.00 hrs, Volume= 0 cf Primary = 0.00 cfs @ 5.00 hrs, Volume= 0 of, Men= 0%, Lag= 0.0 min Primary outflow Inflow, Time Span= 5,00-20.00 hrs, dt= 0.05 hrs Link 1 L: Design Point 1 Hydrograph I I I I E I I I I I I I I I I i I I I I E I I I 1 I I I I I I I Inflow Area=16,668 ;sf I I I I I € € I € I I 1 I I 111511:10 I I I I I t I I I I E I I I I I I I I 1 I I I I I 1 I I I I I I I r I { I I I I I I I I I 1 I I I 1 I I I I I I I I I { I I I 3 I I I I I I I I 3 I I I 3 I I I I I I 3 I 3 3 I 1 I I I I I ! I I i I I I I i 1 I 1 I I 1 I I y I I I i I 3 1 I 1 I I 1 I I I 1 I I I 3 ( I I h ! I I I Q I I I 1 € 3 1 I I I f I I E ! I I € I 1 I I I I I I 4 1 I I I [ 3 I I I { I I I I 1 I 1 I € 3 I I I I I I I 3 I I € I I I I I I I I I I I I E I ! I I I 1 I I I I I I I E 1 E I I I i I I I I I 1 1 E € E E I 3 I I I I 1 1 # E E I E I ! I I I I I I I 3 1 ! I I I I 1 I I I I I I } ! E111 I I I I f { 0.00 cfs o- 5 6 7 8 9 10 i1 12 13 14 15 16 17 18 19 20 71ine (hours) 212 Brentwood Circle_Postdevelopment Type /H 24-hr half inch event Rainfall=0.50" Prepared by Sullivan Engineering Group, LLC Page 56 HydroCADO 7.00 sln 001433 ©1986-2003 Applied Microcomputer Systems 12/27/2021 Link 2L; Design Point 2 Inflow Area 20,558 sf, Inflow Depth = 0.00" for half inch event event Inflow - 0.00 cfs @ 5.00 hrs, Volume 0 cf Primary = 0.00 cfs @ 5.00 hrs, Volume= 0 cf, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Link 2L: Design Point 2 Hydrograph E I I 3 I 1 I ! 1 I I I I I I I I 13 Inflow I I I I f I I I E I I I I I )nf[6, w ;Area=20,08 sf I I I I I I I i E I I I I I 1 I I I I I 3 E 3 I 1 I I 1 I I I I I I E 3 I I I I 1 I I I I I ! E I I 1 I 1 3 I I I I I I E ! I I I 1 ! I I I I I I 3 E I I 1 I I I I I I I I I I E I I 1 I I ! I I I I I 7 E I I 1 I 1 I I I I I 3 E I I 1 I I I I I I I I I E I I 1 I I 3 I I I I I I I I € I I I I I LL I I I I I I I I t I I I I I I ! E 1 I I I I F I I I 1 I I E I I I I I I f I I I I I I E I I I I I I i I I I I I E 1 1 I I I 1 I I I I I k 1 I 1 I I I 1 I I I I I E 1 I I I I I t I I I I I E I I I I I I t I ! I I I E I I I I I I i I I I I I 1 I I 1 I E I 1 I E I I 1 0A0 cfs 0- . . 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours)