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Home My WebLink About2000-12-07 Stormwater Report 10 New Emlarid Business Centor[Rive llratisportration kin[jineers PA Plantiou9 Suite 314 nndown, M 01810-1066 Office 978-.474..8800 Fax 978,G88i 660B I Ref: 2640 November 6, 2000 (TS,. Ms. Heidi Griffin,Town Planner Town of North Andover NOV 0 8 2000 27 Charles Street North Andover, MA 01 845 Re; Endicott Plaza,North Andover,Massachusetts PLANNING Dear Heidi: Vanasse & Associates,Inc. (VAI) was forwarded a copy of an unsigned letter addressed to you from the owner of McLay's Florist relative to the proposed Endicott Plaza development to be located in North Andover, Massachusetts. In brief, the author of the letter requests that the proposed Conceptual Improvement Plan (CIP) prepared for the planned improvements to Osgood Street (Route 125) in the vicinity of the project site be modified in order to provide a center left-turn lane (two-way, left-turn lane (TWLTL)) in advance of the planned left-turn lane on the Osgood Street southbound approach to Barker Street, It is envisioned that the TWLTL would serve to provide better defined access to McLay's Florist over the proposed extension of the left-turn lane on the Osgood Street southbound approach to Barker Street beyond the McLay's Florist driveway. j In response to this request, VAI will work with McLay's Florist to provide an access plan that will meet the needs of the property owner and the design requirements of the Massachusetts Highway Department (MassHighway). At a minimum, the left-turn pocket on the Osgood Street southbound approach to Barker Street can be extended beyond the McLay's Florist driveway and/or a separate left-turn pocket could be constructed for McLay's Florist as a part of the planned improvements to Osgood Street. If you have any questions or would like to discuss this information in more detail, please feel free to contact me. Sincerely, VANASSE&ASSOCIATES, INC. Jeffrey Dirk, P.E, Senior Project Manager cc: W. Barrett—William Barrett Homes M. Howard—Epsilon Associates, Inc. C. Huntress—Huntress Associates,Inc. M. Rosati—Marchionda& Associates,L.P. A, Petrozzelli---Design Partnership Architects,Inc. RDV,F'GH, File F 26401110600 i YDROLOGIC ANALYSIS for ENDICOTT PLAZA NORTH ANDOVER, MASSACHUSETTS Prepared by MARCHIONDA & ASSOCIATES, L.P. 62 MONTVALE AVE. - SUITE I STONEHAM, MA 02180 AUGUST 17, 2000 Revised October 23,2000 ��P��N eF�ASs9 0 a O� DAVID T. 6 C)UELLETTE G�► CIVIL v, , No,4016 , 0A TABLE OF CONTENTS NARRATIVE APPENDIX TR-55 CURVE NUMBER CALCULATIONS TIME OF CONCENTRATION CALCULATIONS RESERVOIR INFORMATION OUTLET STRUCTURE INFORMATION HYDROGRA,PHS: I-YEAR STORM EVENT 2-YEAR STORM EVENT 10-YEAR STORM EVENT 100-YEAR STORM EVENT d NARRATIVE GENERAL The purpose of this analysis is to evaluate the hydrologic impact of the construction of a combination retail/office/hotel development at the site of the Forgetta Farm. on Route 125 in North Andover, Massachusetts (see Figure 1). For detailed information regarding existing site topography and proposed construction, refer to site plans prepared by Marchionda and Associates. SITE DESCRIPTION The project site is a 14 acre parcel which slopes from Rt. 125 towards a large wetland system located along the westerly property line, Portions of the wetland system extend towards and onto the westerly portion of the site. At the southeasterly corner of the site are several small farm buildings and a parking area surrounded by brush and grass. A strip of woods runs along the rear property line adjacent wetlands. The remainder of the site is covered by agricultural fields (approximately half planted with crops, half bare soil). Soil Conservation Service (S.C.S.) mapping indicates that the site is underlain entirely by soils from the"C" hydrologic grouping (Woodbridge and Paxton soils). Refer to Figure 2 for soils information. PROTECT INFORMATION In order to mitigate potential increases in peak rates of stormwater runoff resulting from the proposed increase in impervious groundeover, a stormwater management system has been designed to collect and detain runoff generated from the development. Runoff from parking areas is to be collected by catchbasins and conveyed to a detention basin at the westerly corner of the site. Outflow from the basin is to be controlled by a standpipe type of outlet structure which is designed to reduce peak outlflows for each of the design storms. An independent drainage system is to convey all roof-generated runoff to a large subsurface detention area to be located behind the hotel. The subsurface detention area provides stormwater storage within a network of 30"perforated plastic drainage pipes set in a bed of crushed stone. METHODOLOGY The hydrologic analysis begins with the determination of a study point and delineation of an area which drains to the study point. if necessary for analysis, the study area is divided into subcatch►nent areas. Using watershed modeling techniques outlined in Section 4 of the Soil I � ,. , .A� t;µ y�.� ��' .. J""�'}��., ��p%J:l T�$ �'�r "�..wt" � -.`•r �.�:�6 -. �y, 1 �� y� � �• 5� -.' �aJ; � p,s+s�:�S_,� � � r 'a� _ t - •f � k:S12'.� ��^ 7��;.��<�� ;`fie � ^Y. '�,;ti'k �•w� f,f (A, �' i�?� ,r- _ ._. '�• ,1 a 5 1 !'�.. t> + ` , ~ �- 1 h i a^T'°'s.r y.' � y y`t• ` � �. �i� "7 r �}.• f tr�)) � t ,�-•k rr�Lt� j } � •1' 4 ��e I`� #\. 4i9� �r 1 ° ;'�w `':� �� •t�}t� 4 �i',�� } 'r': �✓�� ''�.' r { rr �tti:�� - � - I�il(r 1 i.. '1 ..` „-�' ��1 t� 1{ ' y .,•s•- - ��, r - .,E � i .I 'j i'[t r ar'}�+, .� r r r. `• � ,�, T l� f efts _ ,2'".g' � i t � �d l y -1 1 •'`f\ 4 r{�J s �'� 4� '. F �y �� : r��• ,�r' �1�;'°�'�Flf.lf` i Jai 1td� � 1 - 1 `� 4'°1 � l�] ",',+1'` �'�r``•. & � -'� t r tr: ( •, s'�'rt �� ° _tom -�� -' ell r � S S ! MARCHIONDA & ASSOC.,L.P. LOCUS PLAN ENGINEERING AND PLANNING CONSULTANTS ENDICOTT PLAZA NORTH ANDOVER,MA 62 MONTVALE AVE.SUITE I STONEHAM,MA.02180 (781)438-6121 SCALE: 1"=1200' FIG. 1 i ..f 1 i 3 Conservation Service (S.C,S.) National Engineering Handbook and methods established in Technical Releases 20 and 55, peak stormwater discharge is determined at the study point for 1, 2, 10 and 100 year 24-hour Type III storm events (which produce 2.6, 3.2, 4.6 and 6.5 inches of rainfall, respectively). The analysis of the study area is repeated for past-development conditions and a stormwater management system is designed to assure that existing conditions peak flows are not exceeded for any of the design storm events. i Since the entire site drains to a single large wetland system located to the west of the site, for the pre-development Hydrologic analyses, the study area was defined by a single subcatchment area (SC-El). Figure 3 delineates the existing conditions subcatchment area. Under proposed conditions, the study area was subdivided into three subcatchments (SC-P 1 a, SC-PIb and SC-Plc). SC-Pla encompasses all proposed parking areas and drains to the above- ground detention basin. Vegetated side slopes along the perimeter of the development which flow undetained to the wetlands comprise SC-Plb, SC-Plc is comprised of rooftop areas which drain to the proposed subsurface detention area. For delineation of the post-development subcatclunents and a diagram of the hydrologic routing, refer to Figures 4 and 5, respectively. CONCLUSION The analyses indicate that the proposed stormwater management system is effective and this development will not cause an increase in peak stormwater flows to the adjacent wetlands, Presented below is a summary of the peak runoff discharges at the downhill property line. SUMMARY OF PEAK FLOWS TO THE WETLANDS(ets) PRE-DEVELOPMENT POST-DEVELOPMENT 1 1'r.storm► 2 1'r.Storm 10 Yr.store► ltlll W.Storm l W.Slornt 2 W.Sturm Ill Yr.Storm 100 Yr.Storm 14 20 35 57 14 17 34 55 �. ©PE®DEIV'E LOP 9V NT SC- El r POST-DEVELOPMENT 1 SC-PIA SC-P1C 1 U DRES. ROUTERES. RO TETHROUGH PROPOSED SURFACE DETENTION BASIN 1 1 SC-P1B WAIN O 0 C v� HYDROLOGY SEQUENCINGfviARi�Hi0I�GA & AS�0 C.,L.P. - I;yolcOrl- I'I.AZA ENGINEERING AND PLANNING CONSULTANTS NORTH ANDOVER,MA 52 MONTVALE AVE.3U1TE I STONEHAM, MA,02180 FIG, 5 (781)438-6121 SCALE: NONE - APPENDIX I f TR-55 CURVE NUMBER CALCULATIONS E i Worksheet 2: Runoff curve number and runoff Project By Date Location . Checked Date Circle one: esent Developed I. Runofff curve number (CN) -------------- Soil name Cover descripcion Area 7xa and CST / hydrologic (cover type, treatment, and <, group hydrologic condition; cv i cres percent impervious; y `~ `�� Omi2 unconnected/connected impervious c4 an ❑ (appendix A) area ratio) 1/ Use only one CN source per line. Totals ', g CV (weighted) - total product _ 091 total area �. Use CN 2 Runoff Storm 11 Storm #2 Stott. :13 Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. yr Rainfall, P (24-hour) . . . . . . . . . . . . . . . . . . in Runoff, Q . . . . . . . . .. . .. . . . . . . . . . . . . . . .. in (Use P and CN with table 2-1, fig. 2-1, or eqs. 2-3 and 2-4.) D-2 (210•VT-TR•55, Second Ed., June 1986) I Worksheet 2: Runoff curve number and runoff Project By Date Location . Checked Date y Circle one: Present Deveiaped °"`' r 1, Runoff curve number (CN) Soil name Cover description Area Producc and C`1 of hydrologic (cover type, treatment, and (u C� x area group hydrologic condition; 11 i' 'i %acres percent impervious; ID r� �r ❑mil unconnected/connected impervious r (appendix A) area ratio) FF -H -H ❑ . 1 �r� 97 T C 1/ Use only one CY source per line. Totals CN (weighted) total product total area 1 Use CN 2 Runoff Storm J1 Storm U2 Storm �13 Frequency . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . yr Rainfall, P (24--hour) .. . . . . . . . . . . . . . . . . in Runoff, Q . . . . in {Use P and CN with table 2-•1, fig. 2-1, or eqs. 2•-3 and 2-4.) D•2 (210-V7-TR•55, Second Ed., June 1986) Worksheet 2: Runoff curve number and runoff Project By Date Location . Checked Date ,. Circle one: Present a oped �- 1. Runoff curve number (CN) Soil name Cover description Area Product and C,d 1/ of hydrologic (cover type, treatment, and r" �� .c ares group hydrologic condition, �i j' acres percent impervious; C N 2 ❑mi- unconnected/connected impervious (appendix A) area ratio) � � � ❑ " 1/ Use only one CN source per line. Totals CN (weighted) total product -! «,t total area Use C;I ? Runoff Storms Jl Stogy r12 SCor :13 Frequency yr Rainfall, P (24—hour) in Runoff, Q in (Use 2 and CN with table 2--1, fig. 2--1, or eqs. 2--3 and 2-4.) D-2 (210-VI-TR-55, Second Ed., June 1986) W . orlQheet 2- Runoff curve number and runoff Project By Date Location . Checked Date A Circle one: Presen eveloped ,, .. t, Runoff curve number (CAI) Soil name Cover description Area Product and CY 1/ of hydrologic (cover type, treatment, and ry C;{ x area group hydrologic condition; cv i I acres percent impervious; w re re ❑ml.2 unconnected/connected impervious H (appendix A) area ratio) M � ? i� Use only one Cif source per line, a Totals CY (weighted) total product total area Use C:I 2. Runoff Storm 411 Storat #2 Storm :13 Frequency yr Rainfall, P (24—hour) . . . . . . . . . . . . . . . . . . in Runoff Q . • • 1 . • 4 \ in . . . . . . . . . . • . I . .. (Use P and CN with table 2W-1, .fig. 2--1, or eqs. 2-3 and 2--4.) D-2 (210-VI-TR•53, Second Ed., June 1986) TIME OF CONCENTRATION CALCULATIONS r 08/04/00 Time of Concentration TR55 SHEET FLOW Manning ' s n: 0 . 4000 Flow Length: 50 . 0000 ft 2yr/24 hr Rainfall : 3 . 2000 in Land Slope : 0 . 1000 ft/ft Travel Time : 6 . 4789 min SHALLOW FLOW K(Land use/Flow Regime) : 1 . 6000 Watercourse Slope : 0 . 0150 ft/ft Flow Length: 950 . 0000 ft Velocity: 1 . 9596 ft/s Travel Time : 8 . 0799 min CHANNEL FLOW Hydraulic Radius : 0 . 0000 ft Channel Slope : 010000 a Manning' s n : 0 . 4000 Flow Length: 0 , 0000 ft Velocity: 0 . 0000 ft/s Travel Time : 0 . 0000 min Time of Concentration: 14 . 5588 min HHCaIc, Version 7 - Os Eagle Point , 4131 WestMark Drive, Dubuque, IA, 52002 , 1-800-678-6565 08/11/00 Time of Concentration TR55 SHEET FLOW Manning' s n: 0 . 4000 Flow Length: 50 , 0000 ft 2yr/24 hr Rainfall : 3 . 2000 in Land Slope : 0 . 0800 ft/ft Travel Time : 7 , 0837 min SHALLOW FLOW K(Land use/Flow Regime) : 1 . 6000 Watercourse Slope : 0 . 0900 ft/ft Flow Length: 240 . 0000 ft Velocity: 4 . 8000 ft/s Travel Time : 0 . 8333 min CHANNEL FLOW Hydraulic Radius : 0 . 0000 ft Channel Slope : 0 . 0000 0 Manning' s n : 0 . 4000 Flow Length: 0 . 0000 ft Velocity: 0 . 0000 ft/S Travel Time : 0 . 0000 min Time of Concentration : 7 . 9171 min HHCalc, Version 7 . Os Eagle Point, 4131 WestMark Drive, Dubuque, IA, 52002 , 1-800-678-6565 MARCHIONDA & ASSOCIATES, L.P. Boa Land Planning & Surveying • Civil Engineering 62 Montvale Ave. Suite I SHEET NO. of STONEHAM, MASSACHUSETTS 02180 CALCULATED BY DATE (781) 438-6121 Fax (781) 438-9654 Email: engineers@)marchionda.com CHECKED@Y DATE SCALE t ° : RESERVOIR INFORMATION i 10/20/100 Page l RESERVOIR REPORT RECORD NUMBER 2 i STORAGE TYPE MAN STAGE/AREA DISCHARGE TYPE COMP STAGE/DISC DESCRIPTION PROP, BASIN (WITH SLOPED BOTTOM) (RATING CURVE LIMT] Minimum Elevation...... . .. ...... . .. ...... . = 130.00 (ft) Maximum Elevation... .—. ........ . . . . ..... . 138.00 (ft) Elevation Increment.... . .. ...... . . . . .... . . = 0.10 ift) (STAGE STORAGE INFORMATION) Input file = NULL Output file = NULL [Manual Contour Area vs. Elevation] ------------------------------------------------ ELEVATION CONTOUR AREA (ft) (sgft) ------------------------------------------------ 130.00 10.00 132.00 2100.00 134.00 3550.00 135.00 5550.00 13B.00 8400.00 [STAGE DISCHARGE INFORMATION] OUTLET STRUCTURE: STR (] 1 TYPE STAND PIPE WEIR DESCRIPTION PROP. BASIN STANDPIPE (FOR SURFACE DET. AREA) I W20/100 Page 1 RESERVOIR REPORT RECORD NUMBER 1 STORAGE TYPE MAN STAGE/AREA DISCHARGE TYPE COMP STAGE/DISC DESCRIPTION PROP, SUBSURFACE DETENTION BASIN FOR ROOFS (RATING CURVE LIMIT) Minimum Elevation.. . .. . . . .... . ...... . ... . = 133.50 (ft) Maximum Elevation.. ... . . ....... . ...... ... . = 138.00 (ft) Elevation Increment. .. . ........ . ..... . ... . = 0.10 (EL) (STAGE STORAGE INFORMATION) Input file = NULL Output file = NULL (Manual Contour Area vs. Elevation] ------------------------------------------------ ELEVATION CONTOUR AREA (ft) (sgft) ------------------------------------------------ 133.50 2500.00 134.00 6250.00 134.50 7000.00 135.00 7000.00 135.50 6250.00 136.00 2500.00 136.50 2500,00 137.00 2500,00 137.50 2500,00 138.00 2500.00 [STAGE DISCHARGE INFORMATION] OUTLET STRUCTURE: STR 4 2 TYPE CIRCULAR PIPE w/ beveled ring; 45deg bevels DESCRIPTION 8" DIA. OUTLET PIPE FROM SUBSURFACE DETENTION } OUTLET STRUCTURE INFORMATION I 10/20/100 Page 1 OUTLET STRUCTURE REPORT RECORD NUMBER 1 TYPE STAND PIPE WEIR DESCRIPTION PROP. BASIN STANDPIPE (FOR SURFACE DET. AREA} [RATING CURVE LIMIT] Minimum Elevation....... ......... .. . .. . ... = 130.00 (£t) Maximum Elevation.............. . .... .. .... = 138.00 (ft) Elevation Increment..... ........ . .. . .. .... = 0.10 (ft) (STANDPIPE INFORMATION] DESCRIPTION : RECTANGULAR STAND PIPE [OUTLET STRUCTURE INFORMATION] Width.. . ... . ...... ............. .. ..... . ... = 2.00 (ft) Height.. .. . . .. .... ............. . . ... .. .... 2.00 (ft) Crest Length.. ... . .. .... ....... .. .. . .. .... 8.00 (ft) Crest Elevation... ...... ....... .. ..... . ... = 138.50 (ft) Fraction Open Area.. .... ......... ... .. . ... 0.500fl0 [RECTANGULAR STAND PIPE EQUATION] ORIFICE EQ: Q = Co*A(2gh)''0.5 WEIR £Q: Q = Cw*L*H"exp Coefficient Co = 0.60000 Coefficient Cw = 3,33000 Exponential. .. ............... . .. ....... . .. 1.50000 [DEFINITIONS) R = Headwater depth above inlet control section invert, {ft) A = Wetted area, (,sgft) L = Crest length, (ft) [ORIFICE INFORMATION] SUBRECORD 1 DESCRIPTION 3011 dia orifice I=134.80 [OUTLET STRUCTURE INFORMATION] Radius. ..... .. . ... .. . ... ... ...... .. . .. .... 1.25000 Invert Elevation. ... . .. . . .. ...... .. ... ... . = 134,80000 (ft) Coefficient Co. . . . .. . ... . .. ...... .. . . . .... = 0.60000 Rof Openings— . . .. . ... ...... .. ... . .. .... - 1 [CIRCULAR ORIFICE EQUATION] Q = Co*A*(2gh]/k]"0.5 A = Wetted area, (sgft) r K = 1 7 I 10/20/100 Page 2 OUTLET STRUCTURE REPORT RECORD NUMBER 1 TYPE STAND PIPE WEIR DESCRIPTION PROP, BASIN STANDPIPE (FOR SURFACE DET. AREA) [ORIFICE INFORMATION) SUBRECORD 2 DESCRIPTION 18" dia orifice (OUTLET STRUCTURE INFORMATION] Radius...... .. ....... ... ...... ... ....... . . = 0.62500 Invert Elevation..... . .. ...... . ......... .. = 130,00000 (ft) Coefficient Cc....... . .. ...... ...... ... . .. = 0.60000 # of Openings....... . ... ...... .......... . . = 1 [CIRCULAR ORIFICE EQUATION] Q - CO*A*[2gb)/k]"0.5 A = Netted area, (sgft) K = I (CULVERT INFORMATION] DESCRIPTION : CIRCULAR CONCRETE/gry end/headwall [OUTLET STRUCTURE INFORMATION] Circular Radius.. . .. .... . ............ .. . .. = 1.25000 (ft) Culvert Invert Elevation. ..... ....... .. . . . = 130,00000 (ft) Slope... .. . . . . ... . .. ..... ........ ..... . .. . 0102000 Manning's N-valve... . ................ .. . .. = 0.01100 Orifice Coefficient. .... ......... .... . . . . = 1100000 Tailwater.. . .. ... ... ................ . .. . .. = 0.00000 (ft) Number barrels... ................... . . . . .. = 1 [UNSUBMERGED EQUATION] H/Diam = He/Diam + K *(Q/A*Diam"0.5))^M - 0.5*S"2 '. Coefficient K.. . .. . . . . .. .... ..... ... . .... . = 0,00780 coefficient M. . . ... . . ... . .. . .. ... .. . ...... 2.00000 (SUBMERGED EQUATION) R/Diam = c*{Q/(A*Diam"0.5))+2 + Y - 0.5*S^2 Coefficient e.. . . . . ..... . ..... ... ... . ... . . = 0,02920 Coefficient Y. . .. . . ..... . ..... ...... .... . . = 0,74000 i 10/20/100 Page 3 OUTLET STRUCTURE REPORT RECORD NUMBER 1 TYPE STAND PIPE WEIR DESCRIPTION PROP. BASIN STANDPIPE (FOR SURFACE DET. AREA) (DEFINITIONS) H = Headwater depth above inlet control section invert, {ft) Diam = Inerior height of culvert barrel, (ft) He = Specific head at critical depth (dc + Vc"2/2g), (ft) Q = Discharge, {cu€t/s) A = Full cross sectional area of culvert barrel, (sq€t) S = Culvert barrel slope, (ft/ft} I 10/2D/1D0 Page l OUTLET STRUCTURE REPORT RECORD NUMBER 2 TYPE CIRCULAR PIPE w/ beveled ring; 45deg bevels DESCRIPTION 8" DIA. OUTLET PIPE FROM SUBSURFACE DETENTION [RATING CURVE LIMIT] Minimum Elevation... . . . . ... . . . . . ..... ..... = 133,50 (ft) Maximum Elevation... . . . ... . . . . .. ......... . = 138.00 (ft) Elevation Increment. .... ... .. . . . . ........ 0.10 (ft) [OUTLET STRUCTURE INFORMATION] Circular Radius.. . .. . ........ . . . . ........ . 0.33000 (ft) Culvert Invert Elevation..... . . . . ...... .. . = 133.50000 (fty Slope....... ..... . .. . .. ...... . .. . ....... . . = 0.00500 Hanning's N-value... . .. .... . . . . . . ......... = 0.01100 Orifice Coefficient— .. .... . . . ... ........ . = 1.00000 Tailwater... ..... ... . .. ...... . ........... . = 0,00000 (ft} Number barrels... ... . ...... .. .. . .......... = 1 [UNSUBMERGED EQUATION] H/Diam = He/Diam + K *(Q/A*Diam"0.5)) M - 0.5*S^2 Coefficient K. .. . . .. . .. ..... . . . ......... . = 0.00180 coefficient M. . ... .. .... ..... . ... ........ . = 2,50000 [SUBMERGED EQUATION] H/Diam = c*(Q/(A*Diam�0.5))"Z + Y - 0.5*S"2 Coefficient c.. .. . .. . ........ . ........... . = 0.03000 Coefficient Y.. . . . . . . ... ...... .. . ........ . 3 0.74000 (DEFINITIONS) H = Headwater depth above inlet control section invert, (ft} Diam = Inerior height of culvert barrel, (ft) He = Specific head at critical depth (dc + Vc"2/2g}, (ft) Q = Discharge, (tuft/s) A = Full cross sectional area of culvert barrel, (sgft) S Culvert barrel slope, (ft/ft) a HYDROGRAPHS 1-YEAR STORM EVENT I 10/20/100 Page 1 HYDROGRAPH REPORT RECORD NUMBER 1 TYPE : COMPUTED FLOOD DESCRIPTION SC-El, 1-YEAR STORM (HYDROGRAPH INFORMATION) Peak Discharge. ......... ..... . .. ...... .... = 13.52 (cfs) Volume..... .... .. .... ... ..... . .. . . .... . ... = 1.30 (acft) Time Interval. ... ....... ..... . .. . . .... . ... = 2 (min) Time to Peak... . . ............ .... ..... . ... 730,00 (min) Time of Base... . . ... ......... . .. . .... . .. . = 1470.00 (min) Multiplication factor......... ........ . ... = 1.00 [UNIT HYDROGRAPH INFORMATION) Unit hydrograph #... . .. .... .. . . ....... . .. . = 5 Unit hydrograph type... ...... ......... . .. . = CURVILINEAR UH Peak Discharge. . . ... ... .... ... ........ . . . . = 66.16 (cfs) Shape Factor... .. ... ... ..... .......... . . . . 484.00 Time Interval. . .. ... .......... ....... . . .. . - 2 (min) (i Time to Peak.... . ... ... .... ........ . .. .. . = 10.00 (min) Time of Base.... .. .. . . . . .. .......... . .... . - 50.00 (min) Rainfall Excess... .. . .. . .. .......... . .. .. . = 1.00 (in) Basin Lag Time.... .. ... . . . . . ....... . . .... . 9,00 (min) (BASIN DESCRIPTION] Watershed Area. ... .. . .. . . .......... . . . .... = 14.58 (ac) curve Number..... ... . ... . . ...... ... . . ..... _ 82 (TIME CONCENTRATION -- USER DEFINED) Time of Concentration.. . . . ...... . . . .. ..... = 15.00 (min) (RAINFALL DESCRIPTION] Distribution Type. . . . ... . . ...... .. .... .... = SCS ITS Total Precipitation. . . . . . . ... ... .. . ... .... = 2.60 (in) Return Period.. . . . . . . ... . ....... . .. .. . .... _ (yr) Storm Duration. .. ... . .. . . . ...... . .. . . . .... = 24.00 (hr) } 10/20/100 Page 1 HY]DROGRAPH REPORT RECORD NTIMBER 5 TYPE COMPUTED FLOOD DESCRIPTION SC-Pla, 1-YEAR STORM [HYDROGRAPH INFORMATION] Peak Discharge... .... . . . ... .. . ... .... .. . .. = 21.73 (cfs) Volume.... . ... ... ... .. . . ... . . . .. . . ..... . . . 3 1.58 (acft) Time Interval. .. . .... ... ... ... .......... . . - 1 (min) Time to Peak.. ... ... ........ . . ... ....... .. = 724.00 (min) Time of Base.. ...... . .. .... ... .... ....... . = 1440,00 (min) Multiplication factor... ... ... . ........... = 1.00 [UNIT HYDROGRAPH INFORMATION] Unit hydrograph $. . . . ... ... ............... = 4 Unit hydrograph type. —... ........... ..... = CURVILINEAR UN Peak Discharge. ... .. . ..... . .......... . . ... = 114.68 (cfs) Shape Factor..... . ... ..... . ... ... ... . . . ... = 484.00 Time Interval........ ...... .. . .. . . . . .. .. . . = 1 {min) Time to Peak...... ... . ..I. . .. . ... ..... . . . . = 4.00 (min) Time of Base. . ....... ...... . . . .. ...... .. . . = 20.00 {min) Rainfall Excess...... . ..... . . . .. . ....... . . 1.00 (in) Basin Lag Time... .... . . . .... . . . . .......... = 3.60 (min) (BASIN DESCRIPTION] Watershed Area... ...... ................... 10.11 (ac) Curve Number. . ... . .. ................. . .... - 93 [TIME CONCENTRATION --- USER DEFINED) Time of Concentration........ .... .. ... . . . . = 6.00 (min) (RAINFALL DESCRIPTION] Distribution Type. . . . ..... ... .... . . . .. . . . . = SCS III Total Precipitation 2,60 (in) Return Period. ... . . . ...... ... ... .. .... . . . . = (yr) Storm Duration.. . . . . . ..... ... .... . .... . . . . = 24.00 (hr) a 10/2Q/1Q0 Page 1 HYDROGRAPH REPORT RECORD NUMBER 16 TYPE RESER STOR. IND DESCRIPTION 1-YR SC-P1a RES. ROUTE [HYDROGRAPH INFORMATION) Peak Discharge. . ... . ... . . ...... ... . .. ... .. = 11.12 (cfs) Volume..... . ... . . .. . ... . . ..... . .... ..... .. 1.57 (acft) Time Interval.. . . ...... . . ..... . . ..... ... . . 1 (min) Time to Peak.. . . ... ..... . ..... . ........ . . = 733.00 (min) Time of Base— .. ....... ...... . ......... .. = 1440,00 (min) Peak Elevation. . . . ............. ......... . . = 134.16 (£t) (INFLOW HYDROGRAPH INFORMATION] Hydrograph ft. .... . .. . . . .... ..... .. ... . .... = 5 Hydrograph Description. ...... . ... . . . . . .... = SC-Pla, I-YEAR STORM 10/2D/100 Page 1 HYDROGRAPH REPORT RECORD NUMBER 6 TYPE COMPUTED FLOOD ❑ESCRIPTION SC-Plb, 1-YEAR STORM [HYDRCGRAPH INFORMATION) I, Peak Discharge.. . . . . ... . .. . . . . ... . .. .. . ... = 1.57 (cfs) Volume.... . . ... ... . .. ..... . .. . ... . . . .. . ... = 0.13 (acft) Time Interval.. . .. . . . ... ... . . .... . . . .. .... = 1 (min) Time to Peak... ... .. ....... ...... . . . . . . ... = 727.00 (min) Time of Base... . .. . . ....... ........ . . . . ... = 1440.00 (min) Multiplication factor.... ......... .. . ... = 1.00 [UNIT HYDROGRAPH INFORMATION) Unit hydrograph #. ........ ...... . ..... . . . . = 2 Unit hydrograph type...... ....... ..... . . .. = CURVILINEAR UH Peak Discharge. ........... ...... ........ . . = 22.63 icfs) Shape Factor.. . ................. . ...... . . . = 484.00 Time Interval. ... ... ...... ... .. . . . ..... . .. = I {min) Time to Peak. . ... ..... ... . ... . . . . ........ = 5.33 (min) Time of Base. . ......... .. . .. ... . . ... ..... = 26.67 (min) Rainfall Excess.. . .. .. ... . . .. . ... . . .. ..... = 1.00 (in) Basin Lag Time... ..... . .. . . .. ..... . .. . .... = 4.80 (min) (BASIN DESCRIPTION) Watershed Area.... . ... . . . .. . . ... ... .. . .... = 2.66 (ac) Curve Number.. .. . . . . .. . .... .. ...... . .. .... = 73 [TIME CONCENTRATION -- USER DEFINED) Time of concentration. . ............ .... ... = 8.00 (min) [RAINFALL DESCRIPTION] Distribution Type. . . ... ............ . .. . . . . = SCS III Total Precipitation. . . .. ........... . .. . . .. = 2.60 (in) Return Period, . . .. . ... . ... ... ... . . .. _ (yr) Storm Duration. . .. . . ................ .. . . . . = 24.00 (hr) 10/20/100 Page I i HYDROGRAPH REPORT RECORD NUMBER 17 TYPE COMPUTED FLOOD DESCRIPTION SC-P1C, 1-YEAH STORM (HYDROGRAPH INFORMATION) Peak Discharge... ... ... ... ... ............. = 4.54 (cfs) Volume. ..... .. . ........ . .. ...... .......... 0.35 (acft) Time Interval. ....... . ... .. . .... ..... .... - 1 (min) Time to Peak.. . ........ ... .. . .... ......... - 724.00 (min) Time of Base.. . ........ . . . . . . .. ........... = 1440,00 (min) Multiplication factor. . ... ..... ....... ... . - 1.00 [UNIT HYDROGRAPH INFORMATION) Unit hydrograph #. .... . . . .. .. . . . ..... ... . . = 3 Unit hydrograph type.. .. . .. .. ... ..... . ... . = CURVILINEAR UH Peak Discharge.... ..... . ........ ...... ... . = 20.53 (cfs) Shape Factor.. . ... .... .. .............. ... . = 484.00 Time Interval.. ... . ... .......... ...... . .. . = 1 (min) Time to Peak... . . .. .. ........I. ... .... .. . = 4.00 (min) Time of Base... ... .. .. ................... . = 20.00 (min) Rainfall Excess. . . .. . . ............. ...... . = 1.00 (in) Basin Lag Time. . .. . . . . ................ . .. . - 3.60 (min) [BASIN DESCRIPTION] Watershed Area. . ... ... ....... ..... . ...... . = 1.81 (ac) Curve Number.... ... . .. . ... ........ ....... . - 98 (TIME CONCENTRATION -- USER DEFINED) Time of Concentration - 6.00 (min) [RAINFALL DESCRIPTION) Distribution Type... .. . ..... . . . ... ........ = SCS III Total Precipitation.. . .... .. . . . ... .... .... = 2.60 (in) Return Period.. . ... . .. . ... .. . . . ... ...... .. - 2 (yr) SLu m Duration.. .... .. . .... . . . . ......... .. = 24.00 (hr) 10/20/10D Page 1 HYAROGRAPH REPORT RECORD NUMBER 18 TYPE RESER STOR, IND DESCRIPTION SC-PIC 1 YR SUBSURFACE BASIN RES. ROUTE [RYDROGRAPH INFORMATION] Peak Discharge..... . ... . ...... ...... .... . . - 1.20 (cfs) Volume...... .. .... . . ... . ...... ...... .... . . = 0.33 (acft) Time Interval. ... . . . . ... ...... .. . ...... .. . = 1 (min) Time to Peak.. ..... . . .. . ........ . ........ . - 745.00 (min) Time of Base.. ..... . ... . ................ . . = 1440,00 (min) Peak Elevation...... . ... ... ... ... ... . ... . . = 134.50 (ft) (INFLOW RYDROGRAPH INFORMATION] Hydrograph #. ... . . . . ... ... ... ... .... ... .. . = 17 Hydrograph Description. ... ... ... .... ... . . . - SC-PIC, I-YEAR STORM 10/20/100 Page 1 HYDROGRAPH REPORT RECORD NUMBER 25 TYPE COMBINE DESCRIPTION : 1-YR PROP FLOW TO WETLANDS [HYDROGRAPH INFORMATION] Peak Discharge.... ... .... ... .... . . .. . . .. . . = 13.51 (Cfs) '.. Volume.. ... . . . .... ... .... ... . ... ... .. . .. . . - 2.04 (acft) Time Interval. . ... ....... ... ...... ... . ... . = 1 (min) Time to Peak.. .... .... ... ... . ..... .... .... = 730.00 (min) Time of Base. . .... ....... ............. ... . 1440,00 (min) (COMBINE HYDROGRAPH RECORD #] HYDROGRAPH # 6 TYPE : COMPUTED FLOOD DESCRIPTION SC-Plh, 1-YEAR STORM Peak Discharge.. ....... . . ... . ..... . . .. = 1.57 (c£s) Time to Peak.... ...... . .. . .. . .. ... . . . . 727.00 (min) Time Interval... ....... .. . .. . .. ... .... - 1 (min) HYDROGRAPH # 16 TYPE : RESER STOR. IND ➢ESCRIPTION 1-YR SC-Pla RES. ROUTE Peak Discharge. . ...... ... . ... .. . ...... = 11.12 (cfs) Time to Peak.. . . .. ... . ... . ... .. . ..... 733.00 (min) Time Interval.. . .. ... . ... . ... ... ...... = 1 (min) HYDROGRAPH # 10 TYPE ; RESER STOR. IND DESCRIPTION SC-P1C 1 YR SUBSURFACE BASIN RES. ROUTE Peak Discharge. . . . . ... .. .............. = 1.20 (cfs) Time to Peak... . .. . ..... .... . ...... . .. = 745.00 (min) Time Interval.. ........ . .... . .. ... . .. . = 1 (min) 2-YEAR STORM EVENT 10/20/100 Page I HYDROGRAPH REPORT RECORD NUMBER 2 TYPE COMPUTED FLOOD DESCRIPTION SC-E1, 2-YEAR STORM [HXDROGRAPH INFORMATION] Peak Discharge.. . . .. .. . .......... . . . .. . ... = 19.75 (cfs) Volume. .......... ... ....... ... . .. ... . . .... = 1.87 (acft) Time Interval............. ... . ... ......... W 2 (min) Time to Peak..... ....... . . . .. . ... ......... - 730.00 (min) Time of Base..... ... ... . . . .............. .. - 1472.00 (min) Multiplication factor. . ........... ... .. . .. m 1.00 [t]i1X.T HYDROGRAPH INFORMATION] Unit hydrograph 4.... .. . .. . ... .... ... ... . . - 5 Unit hydrograph type. .. . ... ....... . .... .. . = CURVILINEAR UH Peak Discharge... ... . .. . ...... .... ... .. . . . = 66.16 ]afs) Shape Factor.. ... ... . ...... . .. . .. . ... .. ... = 484.00 Time Interval.. .......... . .. .. ... ......... = 2 (min) Time to Peak.. . ......... . ........ .... .... . = 10.00 (min) Time of Base.. .... ... .. . . ......... ...... . . - 50.00 (min) Rainfall Excess.. . .. . ... ....... .. . ... ... .. - 1.00 (in) Basin Lag Time... ... . .... ... .. . .. . ... ..... = 9.00 (min) [BASIN DESCRIPTION] Watershed Area—..... . .. . ......... . ...... . - 14.58 (ac) Curve Number.. ....... . . . . ......... .... . .. . = 82 [TIME CONCENTRATION -- USER DEFINED] Time of Concentration. .. . .. ....... . ...... . = 15.00 (min) [RAINFALL DESCRIPTION] Distribution Type.. .... .. . ... .......... .. . = SCS III Total Precipitation. . . . . . .... ..... . ... . . . . 3.20 (in) Return Period.... . .. . . . .. ........ . . .. . ... . = 2 (yr) Storm Duration.. . . ..... .. ..... . ...... .... = 24.00 (hr} 7 10/20/100 Page I HYDROGRAPH REPORT RECORD NUMBER 7 TYPE COMPUTED FLOOD DESCRIPTION SC-Pia, 2-YEAR STORM [HYDROGRAPH INFORMATIONS Peak Discharge.. . . . ... .... ................ = 28.03 (cfs) Volume.. . . .. ... . . . . .. . . .. . . ... . . .......... 2.06 (acft) Time Interval... . . .. .. . .. . . ... . ......... . = 1 (min} Time to Peak— . . . .. . . . .. . . ... .. . ... ...... = 724.00 (min) Time of Base.. . . . . ... . . .. . . .. . .. .......... = 1440,00 (min) Multiplication factor. . . . . . .. . .. ... ....... = 1.00 [UNIT HYDROGRAPH INFORMATION] Unit hydrograph #......... ......... ... ... . = 4 Unit hydrograph type......... ...... .. . .. . . = CURVILINEAR €7H Peak Discharge.... .. .................. ... . = 114.68 (cfs) Shape Factor... ..... . ........ ......... .. . . = 484.00 Time Interval.. . . . . .. ..................... = 1 (min) Time to Peak... . ..... ..................... = 4.00 {min) Time of Base.. . . .. ... ..................... = 20.00 (min) Rainfall Excess.. . .. . ...... ............... = 1.00 {in) Basin Lag Time... .... ... .. .... ... ......... = 3.60 (min) [BASIN DESCRIPTION] Watershed Area... ...... . . . . .. . . . . .. . .. . ... = 10,11 (ac) Curve Number. . .... ..... . ... .. . .. . . . . .. ... . - 93 (TIME CONCENTRATION -- USER DEFINED) Time of Concentration........ . ... ...... .. . = 6,00 (min) [RAINFALL DESCRIPTION} Distribution Type... . ... . .. ... ... . .. ...... = SCS III Total Precipitation. ... . . . . ... ... . .. ..... . = 3.20 (in) Return Period. .......... .. . . .. . . . . .. . ... . . 2 (yr) Storm Duration. ... ... .. . .. . ... .. ... . . . .. . . = 24.00 (hr) 1 I d' I 10/20/100 Page 1 HYDROGRAPH REPORT RECORD NUP48ER 15 TYPE RESER STOR. IND DESCRIPTION 2--YR SC--Pla RES. ROUTE [HYDROGRAPH INFORMATION) Peak Discharge. . ... ..... ...... . ... . . . ... . . = 13.41 {cfs) volume...... ... . ..... ... . .............. . .. 2,05 (acft) Time Interval... .. . .. . ...... .......... . . .. - 1 (min} Time to Peak. .. ... . .. ....... ... . ..... . ..— = 734.00 (min) Time of Base. .. . ...... ... ... ... . .. . .. ... . . = 1440.00 (min) '.. Peak Elevation. . ... ......... .. . ... ... ... . . - 135.15 (ft) [INFLOW HYDROGRAPH INFORMATION) Hydrograph 4.. ....... ...... ... . . .. .. . ... .. - 7 Hydrograph Description..... . .. ... . .. . . . . . . SC--PIa, 2-YEAR STORM 10/20/100 Page 1 HYDROGRAPH REPORT RECORD NUMBER 8 TYPE COMPUTED FLOOD DESCRIPTION SC-Pib, 2-YEAR STORM [HYDRCGRAPH INFORMATION] Peak Discharge.... . ... .. . ............... . . 2.67 (c€s) Volume...... ... . . . ................ . .. . . . . . - 0.21 tacft) Time Interval... . .. .. ..... ...... . .. . . . . .. .. = 1 (min) Time to Peak. . . .... .. .. . . . ..... ... .... ... . = 726.00 (min) Time of Base....... . ... .... .... ....... ... . = 1440.00 (min) Multiplication factor. ...... ...... . = 1.00 (UNIT HYDRCGRAPH INFORMATION] Unit hydrograph 4. ..... ... ... ........... . . = 2 Unit hydrograph type......... ... ....... . . . = CURVILINEAR UH Peak Discharge...... . ... . ........ .. . .. . ... W 22.63 (Cfs) Shape Factor. . ..... . ... . .. . .... .. . . ... .... = 484.00 Time Interval.. . . ......................— = 1 (min) Time to Peak.. . .. ... .... ..... ....... ... . .. - 5.33 (min) Time of Base. . .... . . . ... ... ... ... . . . .. . ... m 26,67 (min) Rainfall Excess.. . . ..... .. . ..... . .. . .. . .. . = 1.00 ]in) Basin Lag Time. .. ...... .... ... ... ....... . . = 4.80 ]min) (BASIN DESCRIPTION) watershed Area. ... .. . .. . . ..... ... . . . . .. ... = 2,66 (ac) Curve Number... ... ... .. .... ... ... ....... . . - 73 (TIME CONCENTRATION -- USER DEFINED] '... Time of Concentration...... . ..... . ...... . . = 8.00 {min) [RAINFALL DESCRIPTION] Distribution Type... ........ ............ . . = SCS III Total Precipitation.— . .......... . . . . . . . . = 3.20 (in) Return Period.... . . ... . .. . .. ... .. . . .. . ... . = 2 (yr) Storm Duration. . ................. . .... .... W 24.00 1hr) J 10/20/100 Page 1 HYDROGRAPH REPORT RECORD NUMBER 19 ', TYPE COMPUTBD FLOOD DESCRIPTION SC-P1C, 2-YEAR STiORIM (HYDROGRAPH INFORMATION) Peale Discharge. . . . ....... . . .....• . •... •. . = 5.62 (Cfsl Volume....... . . .. ... ...... . ....... . ... . .. . 0.44 (acft) Time Interval. .... .. .. ... . ............ • • • • - 1 (min) Time to Peak. ..... . . .. . . . . ......... . = 724.00 (min) Time of Base...... . . .. ....... ......... ... . = 1440.00 (min) Multiplication factor.. .....• .• ........... = 1.00 (UNIT HYDROGRAPH INFORMATION] unit hydrograph #. .. ..... . . ........ .... .. . = 3 Unit hydrograph type. ... . . . ...... ..... . .. . = CURVILINEAR UH Peak Discharge... . .. . . . . . . . ........ ... .. . . = 20.53 (cfs) Shape Factor..... . .. . . .. .. ... .....• •. • .. . - 484.00 Time Interval.. .. . ... ... ...... . . ...• • .... = 1 (min) Time to Peak... .. ... ........ . ............ = 4.00 (min) Time of Base.... . ............ . ... ......... = 20,00 (min) '.. Rainfall Excess.. ........ .. ... ... . ..... ... = 1.00 (in) Basin Lag Time... . ...... . ........ . ..... .. . = 3.60 (min) [BASIN DESCRIPTION] Watershed Area. .. . . . .... . . . ........ ... . .. . - 1.81 (ac) Curve Number... ... .. . .. . . . .......... = 98 [TIME CONCENTRATION -- USER DEFINED] Time of Concentration......... ... . ........ = 6.00 (rain) (RAINFALL DESCRIPTION) Distribution Type. .. . .. . ... . ........ . . . ... = SCS III Total Precipitation.. ... . ..... . ....• • ..... = 3.20 (in) Return Period. . .. . ....... ..... . ..... . ..... = 2 (yr) Storm Duration... .. .... . ........... m 24.00 (hr) i 10/20/100 Page 1 HYDROGRAPH REPORT RECORD NUciBER 20 TYPE RESER STOR, IND DESCRIPTION SC-P1C 2 YR SUBSURFACE BASIN RES. ROUTE [HYDROGRAPH INFORMATION] Peak Discharge.... .. .. ... .. .... ...... . .. .. = 1,59 (cfs) Volume..... . . . . ... ... . .. . .. .... ... ... . . . .. - 0.42 (acft) Time Interval.. ... .... .. . .. .......... . .. .. T 1 (min) Time to Peak. .. ...... ... . .. .... ...... . . . .. = 744.00 (min) Time of Base. .. ... .. .. .. . .. . .. ....... . . . . . = 1440.00 {min) Peak Elevation. ... ... . ... .. . ... ... . . . . . . .. = 134,66 (ft) [INFLOW HYDROGRAPH INFORMATION] Hydrograph 4.. ... .. . .... .. . .. . ... . .. . .. . . . = 19 Hydrograph Description.. ... .. . .... ... ... . . = SC-P1C, 2-YEAR STORM '.. 1 10/20/100 Page 1 HYDROGRAPH REPORT RECORD NUMBER 26 TYPE COMBINE DESCRIPTION : 2-YR PROP FLOW TO WETLANDS 1HYDROGRAPH ZNFORMATIONJ Peak Discharge, ......... ... . ... . = 16.84 (c£sI Volume...... .. . . .................. ... . .... = 2.69 (acft) Time Interval. . . . ........ . ........ . .. . .. . - 1 (min) Time to Peak.. . . ......... ......... ... . .... - 732.00 (min) Time of Base.. . .. ................. . .. . .... = 1440.00 (min( (COMBINE HYDROGRAPH RECORD #J HYDROGRAPH # 8 TYPE : COMPUTED FLOOD DESCRIPTION SC-Plb, 2-YEAR STORM Peak Discharge. . ... . . . . . .. ...... .. . . .. = 2.67 (cfs) Time to Peak. . . . ... . . . . . .. . .... . . .. . .. = 726.00 (min) Time Interval. . . . ...... . . . . ..... . ... .. = 1 (min) HYDROGRAPH # 15 TYPE : RESER STOR. M DESCRIPTION 2-YR SC-Pla RES. ROUTE Peak Discharge. . ... ............ ... ... = 13.41 (cfs) Time to Peak.. . . . ... .... ........ ...... = 734.00 (min) Time Interval.. . . ..................... = 1 (min) HYDROGRAPH # 20 TYPE : RESER STOR. IND DESCRIPTION SC-P1C 2 YR SUBSURFACE BASIN RES. ROUTE Peak Discharge.. . . . . ............... ... = 1,59 (cfs) Time to Peak.... . . . ... ...... . ...... .. . = 744.00 (mint Time Interval... . . . ... .... .. . ..... ... . = 1 (min( 10-YEAR STORM EVENT 10/20/100 Page I HYDROGRAPH REPORT RECORD NWRER 3 TYPE COMPUTED FLOOD '.. DESCRIPTION SC-El, 10-YEAR STORM '.. [HYDROGRAPH INFORMATION) Peak Discharge... . . ..... ... . ...... .... . . .. - 35.25 (cfs) Volume..... . .. . .. . ... . .. . ........ .... . . ... = 3.31 (acft) Time Interval. .... .. .... . ... ......... .. . .. = 2 (min) Time to Peak.. . .. . . . .... . ........ . ..... . .. = 730.00 (min) Time of Base.. ... . .... .. . ........ . ..... . .. = 1474.00 (min) Z�ultiplication factor... . ........ . ..... . .. = 1.00 [UNIT HYDROGRAPH INFORMATION] Unit hydrograph 4. . . ..... ..... . ......... .. = 5 Unit hydrograph type. ... . .. ... . ... ...... .. = CURVILINEAR UH Peak Discharge. ..... . ... ... . . . . ..... .... . . = 66.16 Icfs) Shape Factor... ..... . ... ... ... ...... . .. .. . = 484.00 Time Interval.. .. ... . .. .... .... ........ .. . = 2 {min) Time to Peak.. . .. ... . .. . ... . ... ...... .. ... = 10.00 (min) Time of Base— .. ... . .. . ... . ........ . .. ... = 50.00 (min) Rainfall Excess. . . .. . . . . ... ...... ... . . . ... = 1.00 (in) Basin Lag Time. .. ... . . . . . ........ ...... . .. = 9.00 (min) (BASIN DESCRIPTION] Watershed Area. . . .... . .. . ..... ... .. .. . . . .. = 14.58 (ac) Curve Number... .. . .. . . .. . ..... ... ... .. . . 82 [TIME CONCENTRATION -- USER DEFINED) Time of Concentration... . ..... .......... . . = 15,00 (min) '.. [RAINFALL DESCRIPTION] Distribution Type.. . . ... . ..... ... ....... . . = SCS III Total Precipitation. . ... . ..... . .. ....... .. = 4,60 (in) Return Period. . .. . . . . ... . .. ... . ........ . .. = 10 (yr) Storm Duration. . . . . . . ... . ..... . ........ . . . 24.D0 (hr) 10/20/100 Page I HYDROGRAPH REPORT RECORD NWRER 9 TYPE COMPUTED FLOOD DESCRIPTION SC-Pla, 10-YEAR STORM [HYDROGRAPH INFORMATION] Peak Discharge.... . . . .. . .. . ... . .. . ...... .. 42.60 (cfs) Volume... .. . ...... . . . .. ... . ... . . . ...... ... = 3.21 (acft) Time Interval..... .. . .. . .. . ... .... ........ = 1 (min) Time to Peak.. ..—. . .. . .. . .. . . ... ........ = 724.00 (min) '.. Time of Base...... . . . .. . .. . ... . ........... - 1440.00 (min) Multiplication factor. . . . . . .. ............. = 1.00 (UNIT HYDROGRAPH INFORMATION] Unit hydrograph 0.... ... ... ...... ... .. . .. . = 4 Unit hydrograph type. ... ... . ........ ...... = CURVILINEAR UH Peak Discharge... . ...... ............... .. . 114.68 (cfs) Shape Factor.. ... ....... ............. . . .. . W 484.00 Time Interval. ....... ... ... ........... . .. . = 1 (min) Time to Peak--.................. . . . .. . - 4.00 (min) Time of Base.. ... ............. ....... . . .. . 20.00 (min) Rainfall Excess. ........... ... .. ... . .. . .. . - 1,00 (in) Basin Lag Time... . ............ .. . .. . .. . .. . = 3.60 (min) (BASIN DESCRIPTION] Watershed Area. ... . . . ... .. . . .... . ..... .... - 10.11 (ac) Curve Number...... .. . .. ... ... . . . . ......... = 93 [TIME CONCENTRATION -- USER DEFINED] Time of Concentration. .. ... ............... = 6,00 (min) (RAINFALL DESCRIPTION) Distribution Type... . ................. .... = SCS III Total Precipitation................ ... ... . = 4.60 (in) Return Period......................... .... = 10 (yr) Storm Duration....... .. ................... = 24.00 (hr) 10/20/lOfl Page 1 HYDROGRAPH REPORT RECORD NUMBER 14 TYPE RESER STOR. IND DESCRIPTION 10-YR SC-Pla RES. ROUTE [HYDROGRAPH INFORT•%TION] Peak Discharge.. .. .... ... . . . .. ....... . . ... - 27.38 (cfs) Volume.. . . .. . .. . .. ... . .. . ...... ...... . ..— - 3.20 (acft) Time Interval.. . ... .. . .. . ................. = 1 {min} Time to Peak. .. . ... .. . .. ............. . .... = 730,00 {min} Time of Base. .. . .. . . .... . ............ ..... = 1440.00 (min) Peak Elevation. ... . . . .... ...... . ........ . . = 136.33 [ft} (INFLOW HYDROGRAPH INFORMATION] Hydrograph 4... ...... ... . .. ... . .. . ... . . . .. = 9 Hydrograph Description.. ... .. .. .. . ... . . . .. = SC-Pla, 10-YEAR STORTd i i 10/20/100 Page 1 HYDROGRAPH REPORT RECORD NUMBER 10 TYPE COMPUTED FLOOD DESCRIPTION SC-P1b, 10-YEAR STORM [HYDROGRAPH INFORMATION] Peak Discharge....... ......... . ..... . ..... = 5.67 (cfs) Volume-- . .. .--.. . ........ ...... .. .... 0.43 (acft) Time Interval. ................. ..... . . . . .. - I (min) Time to Peak—.. ....... . ...... ..... . . . . .. = 726,00 (min) Time of Base.. ... ........ ...... ..... .. . ... = 1440.00 (min) Multiplication factor.... ........... . .. . .. = 1.00 [UNIT HYDROGRAPH INFORMATION] Unit hydrograph 9. ............ ... ... . . . . . . 2 Unit hydrograph type..... ..... ...... .. . . . . = CURVILINEAR UH Peak Discharge... . ...... ............ . . . ... = 22.63 (cfs) Shape Factor.. .—...... ... ... ... .... .. . . . = 484.00 Time Interval. . ... .. ... .... ... ...... ...... = 1 (min) Time to Peak.. . ... .. . ...... .. . ............ = 5.33 (min) Time of Base.. . ... . . .... ... . .. .... ........ = 26.67 (min) Rainfall Excess... .. .... ...... ............ = 1.00 (in) Basin Lag Time - 4.60 (min) [BASIN DESCRIPTION] Watershed Area. ... .. . .................. ... W 2,66 (ac) Curve Number.. . ..... . ................. .... - 73 [TIME CONCENTRATION --- USER DEFINED] Time of Concentration... ... ... ... . . . . . . ... = 8.00 (min) [RAINFALL DESCRIPTION) Distribution Type.... ......... ..... . .. . ... - SCS III Total Precipitation.. ......... ..... . . . . ... = 4.60 (in) Return Period. .... ............... .. . . . . ... = 10 (yr) Storm Duration....... ............ .. . . . . ... 24.00 (hr) t 10/20/100 Page I HYDROGRAPH REPORT RECORD NUMBER : 21 TYPE COMPUTED FLOOD DESCRIPTION ; SC-PIC, ID-YEAR STORM (HYDROGRAPH INFORMATION) Peak Discharge. . .. . .. . ..... ... . ........ . .. = 8.13 (Cfs} Volume...... ... ... ... . ..... . ........... . .. = 0.65 (acft) Time Interval. . ... ... ...... . .. . ........ ... = I (mint Time to Peak.. . ... ... . ..... ... . ... ..... ... - 724.00 (min} Time of Base...... ... . ..... . .. . ... .... . . .. = 1440.00 (mint' Multiplication factor. ,..... .. ... 1.00 (UNIT HYDR06RAPR INFORMATION] Unit hydrograph It. ... . ..... ............ . .. = 3 Unit hydrograph type. ............ ....... .. = CURVILINEAR UH Peak Discharge..... .. ............ ... .... .. = 20.53 icfs) Shape Factor...... . ........... ... . ...... . . 484,00 Time Interval.... .. ........... .... .. . ... . . = I (min) Time to Peak...... ...... .... —— . .. . . .. . . = 4.00 {min) Time of Base..... . ....... . ... ... ... . . . . . . - 20,00 {min) Rainfall Excess... ...... . ........ . ... .. . . . = 1.00 (in) Basin Lag Time... . ...... . ..... ... . .. .. . . . . 3.60 {min) (BASIN DESCRIPTION) Watershed Area... . ......... .. . .... ... .. ... = 1.61 (ac) Curve Number.. . .. . ......... ... ... ...... ... 98 (TIME CONCENTRATION --- USER DEFINED] Time of Concentration... ... .. . ......... ... 6.00 (min) (RAINFALL DESCRIPTION] Distribution Type. ...... ... .. . . .. ...... . .. = SCS III Total Precipitation.. ...... ... . ..... ... . .. 4.60 (in) Return Period. ... . ... ... ... .... ........ . .. - 10 (yr) '.. Storm Duration. ... .. . .................. . .. = 24.00 ihr) o I 10/20/100 Page 1 i HYDROGRAPH REPORT RECORD NUMBER 22 TYPE RESER STOR. IND DESCRIPTION SC-PIC 10 YR SUBSURFACE BASIN RES, ROUTE [HYDROGRAPH INFORMATION] Peak Discharge. . .. . .... .. . . ....... .... . . . . = 1.94 {cfs) Volume. ..... . ..... . ... . . . . ....... . .... .. . = 0.63 iacft) Time Interval.. ... ......... ....... . .... ... = 1 {min) Time to Peak. .. .... ........ ....... ....... . - 747.00 {min) Time of Base. . . ... . ........ .... ... ....... . = 1940.00 (Hain) Peak Elevation. ... .. ............... ...... . = 135,11 (ft) [INYL,OW HYDROGRAPH INFORMATION) Hydrograph 4. ..... .... ........ . ......... . . = 21 Hydrograph Description—... . . .......... . . = SC-PIC, 10-YEAR STORM I 10/20/100 Page 1 HYDROGRAPH REPORT RECORD NUMBER 27 TYPE COMBINE DESCRIPTION 10-YR PROP FLOW TO WETLANDS [HYDROGRAPH INFORMATION) Peak Discharge. . .. . .. ... . . . . ........ .... . = 34.07 (cfs) Volume. ... .. . .... .. . . ... . . . . . ... ..... .... . = 4,27 (acft) Time Interval... .... . . .. . . .. . ............ . 1 (min) Time to Peak........ . . .. . . .. . ............ . = 729.00 (min) Time of Base. ........ .. ... ........ ....... . = 1440.00 (min) [COMBINE HYDROGRAP14 RECORD ()) HYDROGRAPH 4 10 TYPE : COMPUTED FLOOD DESCRIPTION SC-Plb, 10-YEAR STORM Peak Discharge. . . . . . .. .. ........ . ..... = 5.67 (cfs) Time to Peak..... . .... . . ........ . . . ... - 726.00 (min) Time Interval.. .... ... . . ....... . . .. ... = 1 (min) HYDROGRAPH 0 14 TYPE : RESER STOR. IND DESCRIPTION 10-YR SC-Pla RES. ROUTE '. Peak Discharge.. ... .. . . . . ... . . . . ...... = 27.38 (cfs) TiMe to Peak.... ... . . .. . . ... .... ...... = 730.00 (min) Time Interval—. ... . . ... . . . . . ......... = 1 (min) HYDROGRAPH O 22 TYPE : RESER STOR. IND DESCRIPTION SC-P1C 10 YR SUBSURFACE BASIN RES, ROUTE Peak Discharge.. .. . ... .... ..... ... . ... = 1.94 (cfs) Time to Peak. ,.. . . .... . . . ...... ... . ... = 747.00 (min) Time Interval.. . . . ... . . .. ...... . .. . ... = 1 (min) i 100-YEAR STORM EVENT s 10/2D/IOp Page 1 HYDROGRAPH REPORT RECORD N[31+1BER 4 TYPE COMPUTED FLOOD DESCRIPTION SC-El, 100-YEAR STORM (HYDROGRAPH INFORMATION) Peak Discharge. ... . . . ... ... ... ....... . . ... = 57.11 (cfs) Volume..... . .. ... . . .. ... . ..... ........ . ... = 5.41 (acft) Time Interval— .... ..... . ..... . ....... .. .. = 2 (min) Time to Peak.. . .. . .. . ......... ....... . .. .. = 730.00 (min) Time of Base... .. .——.. ...... ..... .. . .. . . W 1476.00 (min) Multiplication factor.—..... . . .. .... . . 1.00 [UNIT HYDROGRAPH INFORMATION] Unit hydrograph 8... ... . ................. . 5 Unit hydrograph type. .. . ... ....... . ..... . . = CURVILINEAR U14 Peak Discharge...... . .. . .. . . ....... . ..... . = 66.16 (efs) Shape Factor. . . .. ... . .. . .... ...... . ...... . = 484,00 Time Interval.... ... . . . . .. . . . ........... . . m 2 (min) Time to Peak. . ... ... . . . . .. . ...... ........ . = 10.00 (min) Time of Base. . ...... . ... . .. .............. . = 50.00 ;min) Rainfall Excess...... .. . . .. ........... ... . = 1.00 (in) Basin Lag Time. .. . . .. ... ....... ....... ... . - 9.00 (min) (BASIN DESCRIPTION} Watershed Area... . . . ..... ...... . ...... ... . = 14.58 (ac) Curve Number.. . .. , . .. ... ....... ....... .... - 82 (TIME CONCENTRATION -- USER DEFINED] Time of Concentration........... ........ .. = 15.DO (min) (RAINFALL DESCRIPTION] Distribution Type.. . ............... .... . . . = SCS III Total Precipitation. ............... ..... .. = 6.50 (in) Return Period.. ... . . ... ...... ...... ..... .. = 100 (yr) Storm Duration. . ... . .... .. ... ... ... ... . 24.00 (hr) l I 10/20/100 Page 1 HYDROGRAPH REPORT RECORD NUMBER : 11 TYPE COMPUTED FLOO➢ DESCRIPTION : SC-P1a, 100-YEAR STORM (HYDROGRAPH INFORMATION] Peak Discharge... ....... . ...... . ... . . = 62.12 (cfs) Volume...... .. ... ....... ... . .. .... .. . ... . . = 4.78 (acft) Time Interval. . .. ....... ... . .. .... .. . ... . . = 1 (min) Time to Peak.. ... . ... . . ...... ... . ... ... .. = 724.00 (min) Time of Base.. . .. . ... .. ..... .. . . . ... ... . . = 1440.00 (min) Multiplication factor.. . . ... .. . .. . ... .... . = 1,00 (UNIT HYDROGRAPH INFORMATION) Unit hydrograph #. .. . ... . ..... . ....... .... = 4 Unit hydrograph type. ... . ...... ..... .. . ... = CURVILINEAR UH Peak Discharge. ... ... ... . ...... ..... . . . ... = 114.68 (cfs) Shape Factor...... .. . ... . .. .... ..... .. . ... = 484.00 Time Interval.............. ........ . . .. . .. = I (min) Time to Peak.. ... .... ...... . .. ... ... . .. . . . - 4.00 imin) Time of Base.. . .. .......... . . . ...... .... .. = 20.00 imin) Rainfall Excess.. ...... . ... . . . ...... . .... . - 1.00 (in) Basin Lag Time... ... ... . .... . . ... ... . ... . . = 3,6D (min) [BASIN DESCRIPTION) Watershed Area. ... .. . ... ....... ...... . .. .. = 10.11 (ac) Curve Number... ... ... ... ...... ...... . . . ... - 93 (TIME CONCENTRATION -- USER DEFINED] Time of Concentration.. .... .. . ...... ... . .. = 6.00 (min) [RAINFALL DESCRIPTION] Distribution Type...... ..... .. ..... . ... . .. = SCS III Total Precipitation. ... . .—. . . ..... . ... ... = 6.50 (in) Return Period.... ... . .. .... . .. ... ... .... . . 100 {yr) Storm Duration... ...... .... . . . ...... . .. . .. = 24.00 (hr) 10/20/100 Page 1 HYDROGRAPH REPORT RECORD NUMBER 13 TYPE RESER STOR. IND DESCRIPTION 100-YR SC-Pla RES. ROUTE [HYDROGRAPH INFORMATIONI Peak Discharge. .. . .. ... . . .. . . . . . . ........ . 43.10 (cfs) Volume.... . . ... . . . .. .. . ......... . ........ . = 4.78 {acft) Time Interval.. . . . .... ..... ...... ......... 1 {min) Time to Peak.... ... . ... ................... = 729.00 (min) Time of Base....... .... ................... = 1440.00 (min) Peak Elevation.. ... . ...... ......... .. ..... = 137.42 (ft) (INFLOW HYDROGRAPH INFORMATION) Hydrograph 9.. . .. . ... ................ ... . . - 11 Hydrograph Description.................. .. = SC-P1a, 100-YEAR STORM 10/20/100 Page 1 HYDROORAPH REPORT RECORD NUMBER 12 TYPE COMPUTED FLOOD DESCRIPTION SC-Plb, 100-YEAR STOR14 [HYDRCGRAPH INFORMATION) Peak Discharge. .. .. .... ... .. . . ...... . .. ... = 10.22 (cfs) Volume...... .... . ... . .. . .. . . . . . ..... . . .... = 0.78 (acft) Time Interval....... . .. ... . .......... . . ... = 1 (min) Time to Peak.. .......... ............ .. . .. . = 726.00 (min) Time of Base.. ....... ... .............. . .— = 1440.00 {min) Multiplication factor.............. . .. .... - 1.00 [UNIT HYDRCGRAPH INFORMATION) Unit hydrograph #.. . .. . .. . ..— ...... . . .... = 2 Unit hydrograph type,.. .. .. .......... . . . . . - CURVILINEAR UH Peak Discharge........... .......... ... . .. . = 22.G3 (cfs) Shape Factor. ................ ... .. . .... .. . - 484.00 Time Interval. .. ... ... ...... . . . . . . . . ..... = 1 (min} '.. Time to Peak.. . . . . . ... . .. . .. . .. . ... . . ..... - 5.33 (mint Time of Base. ... . . . ... . . . ...... . ...... ... . 26.67 (min) Rainfall Excess..... ... .. ............. .. . . - 1.00 (in) Basin Lag Time.. ......... ......... .... ... . = 4.80 imin) [BASIN DESCRIPTION] Watershed Area. ... .... ...... .. . . .. . . . . .... - 2.66 lac) Curve Number... .... .. . ... .... .. ...... . .... = 73 [TIME CONCENTRATION -- USER DEFINED] Time of Concentration.... ..... . .. . .... ... . = 8,00 (min) [RAINFALL DESCRIPTION] Distribution Type.. .. . ... .. ....... ... . .... = SCS III Total Precipitation. . .... ...... ...... . .. .. = 6,50 (in) Return Period.. . ... . . . .. ...... ....... . .. . . = 100 (yr) Storm Duration.. ...... ... ..... ... . .... . . . . = 24,00 (hr) i 10/20/100 Page 1 HYDROGRAPH REPORT RECORD NU14BER 23 TYPE COMPUTED FLOOD DESCRIPTION SC-P1C, 100-YEAR STORM [HYDROGRAPH INFORMATION) Peak Discharge.... . .............. ... .... .. = 11.53 1c£s) volume..... . .. ... . ...... ............ ... . .. = 0.94 (acft) Time Interval.... . . ................ . ... . .. = 1 (min) Time to Peak.. .... . .............. . .. .. ... - 724.00 (min) Time of Base.. .... . ....... . ..... . . ... . . ... 1440.00 (min) Multiplication factor.. 1.00 [UNIT HYDROGRAPH INFORMATION] Unit hydrograph. #. . . ............... . .... . . 3 Unit hydrograph type............ . . .. . . .... = CURVILINEAR UH Peak Discharge.... . . ...... . . ... . . .. .. ..... = 20.53 (c£s) Shape Factor... .... . ... .... . .... ...... .... T 484.00 Time Interval. . .... . .. . .. .... ......... . ... = 1 (min) Time to Peak. .. . . .. . ... . . .............. . .. - 4.00 (min) Time of Base.... . . ... .. .. .... ...... ..... . . = 20.00 {min) Rainfall Excess. .. .. ... ............ .. ... . . = 1.00 (in) Basin Lag Time... . ..... ........... . .. . ... . = 3,60 (min) [BASIN DESCRIPTION) Watershed Area. .... . .. ... ... . ......... . . .. 1.81 (ac) Curve Number- . . .. . . .. . ..... . ........... .. W 98 [TIME CONCENTRATION -- USER DEFINED] Time of Concentration.......... ... . .. .... . = 6.00 (min) (RAINFALL DESCRIPTION) Distribution Type. . ... .. . ... . .. ....... . . . . = SCS III '.. Total Precipitation. . . .. . ... . .......... .. 6.50 (in) Return Period.. . .. . . . . . .. ... ...... ... ... .. - 100 (yr) Storm Duration.. .. . . . . . .. ......... .. . ... .. = 24.00 (hr) i 10/20/100 Page 1 HYDROGRAPH REPORT '.. RECORD NUMBER 24 TYPE RESER STOR. IND DESCRIPTION SC-P1C 100 YR SUBSURFACE BASIN RES. ROUTE [HYDROGRAPH INFORMATION] Peak Discharge... . .. .... . .. ........ ...... . = 2.45 (cfs) Volume...... . ..... ......... ....... . ... .... = 0.92 (acft] Time Interval.... . .. ... ........... .... .... = 1 (min) Time to Peak. . ... ...... ......... ...... ... . = 749.00 (min) Time of Base. . ... ...... ............... . ... = 1440.00 (min) Peak Elevation...... ... ........ . ....... .. . = 135.94 (ft) (INFLOW HYDROGRAPH INFORMATION) Hydrograph 4..... .. ... . . . . .............. . . - 23 Hydrograph Description---.... .... ... . . = SC-P1C, 100-YEAR STORM s 10/20/100 Page 1 HYDROGRAPH REPORT RECORD NUMBER 28 TYPE COMBINE DESCRIPTION 100-YR PROP FLOW TO WETLANDS [HYDROGRAPH INFORMATION] Peak Discharge.... . ...... ... . .. ... . .. .... . = 54,55 (oES) Volume... . .. ...... . ... .. .... . . . ... . . . . ... . W 6.47 (acft) Time Interval. .... . .. ....... .. . .... .. . .. .. - 1 (min) Time to Peak. . . ... . .. . ... ...... . ...... . . .. m 728.00 (min) Time of Base.. . .... .. . . .... .... ....... .. .. = 1440.00 (min) [COMBINE HYDROGRAPH RECORD ##] HYDROGRAPH # 12 TYPE : COMPUTED FLOOD DESCRIPTION SC-Plb, 100-YEAR STORM Peak Discharge.. ...... . .. . . . . .. . ... ... = 10.22 (cfs) Time to Peak. ... . . .... . .. . ..... ....... = 726.00 (min) Time Interval..... . .... ... ..... . ...... - 1 (min) HYDROGRAPH # 13 TYPE : RESER STOR. IND DESCRIPTION 100-YR SC-Fla RES. ROUTE Peak Discharge. . ... ... ... .... ... .. . ... 43.10 (cfs) Time to Peak... . .. .... ... .. . . . .... ... = 729.00 (min) Time Interval... .. ..... . . .. . ... .... . .. 1 (min) HYDROGRAPH # 24 TYPE : RESER STOR. IND DESCRIPTION SC--P1C 100 YR SUBSURFACE BASIN RES. ROUTE Peak Discharge..... ............. .. .... = 2.4S (cfs) Time to Peak....... . .. ........... . ... . = 749.00 (min) Time Interval... .. . ... ...... ......... . = 1 (min)