Loading...
HomeMy WebLinkAboutStormwater Report - 163 MAIN STREET 10/2/2006 I PROFESSIONAL. ENGINEERS AND LAND SURVEYOR 1,60 SUMMER STREET HAVERHILL, MASSACF1L.JSETTS O1830-6318 (978)373-0:31.0 FAX: (976)372.3960 Project No.: 06.103 October 2, 2006 Mr. Scott L. Giles, P.L.S. 50 Deermeadow Road North Andover, MA 01345 i RE; Drainage Analysis®Main Street, North Andover Dear Mr. Giles: Per your request we have prepared a drainage analysis for the project site on Main Street in North Andover. Drainage calculations were performed using the SCS Method. Model parameters were developed using topographic information provided on a plan titled, "Plan of Land in North Andover, Mass. Owned by Michael J. Foster and Stephen M. Sullivan"dated September 8, 2006 and revised through September 13, 2006, prepared by your office. In both the pre and post development condition, surface runoff from the parcel flows toward Main Street. The soils on site are classified"Chariton and Canton F=ine Sandy Loam" by the Natural Resource Conservation Service and were modeled as hydrologic soil group"B." Peak Flow rates to the sideline of Main Street are summarized for the 2, 10, and 100-year design storms in the table below: ._... __.. __. _.. _ .. I.. Qpeak peak Ire-Development 1 Post-Development Condition Condition (Cfs) (cfs) 2-yr Storm Event 0.3 0.3 (3.1"124-hr.) I 10-yr Storm Event (4.5"124-hr.) 0.8 0.4 j 100-yr Storm Event 1.5 1 (6.5"124-hr,) Calculations performed using HydroCAD software are enclosed with this letter. Should you have any questions or comments please feel free to contact me at the number listed above. Regards, Philip G. Christiansen, P.E. President i i 1 i i > Pi k EXISTING P1 CONDITIONS / C CP2 CULT C P2 SUMMATION POND �Subcatj Reach /Pond' Link'I Drainage Diagram for Drainage 9-2M6 J ----` J Prepared by Christiansen&Sergi, Inc. 10/2/2006 �' ~�' HydroCAD®7.10 s/n 001057 0 2005 HydroCAD Software Solutions LLC Qrainage 9-25-06 Type U 24-hr 2yr Rainfall=3.10" Prepared by Christiansen & Sergi, Inc. Page 2 HydroCADO 7.10 s/n 001057 0 2005 HydroCAD Software Solutions LLC 10/2/2006 Time span=0.00-24.00 hrs, dt=0.01 hrs, 2401 points Runoff by SCS TR-20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor®Ind method Subcatchment E: EXISTING CONDITIONS Runoff Area=11,823 sf Runoff Depth>0.72" Tc=6.0 min CN=69 Runoff=0.33 cfs 712 cf Subcatchment P1: P1 Runoff Area=7,923 sf Runoff Depth>2.07" Tc=6.0 min CN=90 Runoff=0.65 cfs 1,369 cf Subcatchment P2: P2 Runoff Area=3,849 sf Runoff Depth>1.60" Tc=6.0 min CN=84 Runoff=0.25 cfs 512 cf Pond C: CULTEC Peak Elev=100,87' Storage=625 cf Inflow=0.65 cfs 1,369 cf Discarded=0.03 cfs 1,367 cf Primary=0.00 cfs 0 cf Outflow=0.03 cfs 1,367 cf Pond P: SUMMATION POND Inflow=0.25 cfs 512 cf Primary=0.25 cfs 5 12 cf Total Runoff Area= 23,595 sf Runoff Volume= 2,593 cf Average Runoff Depth = 1,32" Drainage 9®25-06 1 Type 11 24-hr 2yr Rainfall=3.10" Prepared by Christiansen & Sergi, Inc. Page 3 HydroCAD®7.10 s/n 001057 ©2005 HydroCAD Software Solutions LLC 1012/2006 Subcatchment E. EXISTING CONDITIONS Runoff = 0.33 cfs @ 11.98 hrs, Volume= 712 cf, Depth> 0.72" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Type II 24-hr 2yr Rainfall=3.10" Area (sf) CN Description 2,630 98 Paved parking & roofs 9,193 61 >75% Grass cover, Good, HSG S 11,823 69 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Min. Tc Subcatchment P1: P1 Runoff = 0.65 cfs @ 11.97 hrs, Volume= 1,369 cf, Depth> 2.07" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Type 11 24-hr 2yr Rainfall=3.10" Area (sf) CN Description 6,288 98 PVMT AND ROOF 1,635 61 GRASS 7,923 90 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment P2: P2 Runoff = 0.25 cfs @ 11.97 hrs, Volume= 512 cf, Depth> 1.60" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Type II 24-hr 2yr Rainfall=3.10" Area (sf) CN Description 2,396 98 PVMT 1,453 61 GRASS 3,849 84 Weighted Average Tc Length Slope Velocity Capacity Description _(min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Drainage 9-25-06 Type Il 24-hr 2yr Rainfall=3.10" Prepared by Christiansen & Sergi, Inc. Page 4 HydroCAD®7.10 s/n 001057 ©2005 HydroCAD Software Solutions LLC 10/2/2006 Pond D: %CULTEC Inflow Area = 7,923 sf, Inflow Depth > 2.07" for 2yr event Inflow = 0.65 cfs @ 11.97 hrs, Volume= 1,369 cf Outflow - 0.03 cfs @ 11.49 hrs, Volume= 1,367 cif, Atten= 95%, Lag= 0,0 min Discarded = 0.03 cfs @ 11.49 hrs, Volume= 1,367 cf Primary = 0.00 cfs @ 0.00 hrs, Volume= 0 cf Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Peak Elev= 100.87' @ 13.01 hrs Surf.Area= 708 sf Storage= 625 cf Plug-Flow detention time= 163.3 min calculated for 1,367 cf(100% of inflow) Center-of-Mass det. time= 162.3 min ( 966.5 - 804.2 ) Volume Invert Avail.Storage Storage Description #1 99.49' 901 cf Custom Stage Data (Prismatic) Listed below 2,840 cf Overall -588 cf Embedded = 2,252 cf x 40.0% Voids #2 99.99' 588 cf 33.6"W x 20.0"H x 6.33'L Cultec R-180 x 27 Inside#1 1,489 cf Total Available Storage Elevation Surf.Area 1nc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 99.49 708 0 0 101.70 708 1,565 1,565 103.50 709 1,275 2,840 Device Routing Invert Outlet Devices #1 Primary 103.50' 0.17' x 0.17' Horiz. Orifice/Grate X 72.00 Limited to weir flow C= 0.600 #2 Discarded 0.00' 2.000 in/hr Exfiltration over Surface area Discarded OutFlow Max=0.03 cfs @ 11.49 hrs HW=99.53' (Free Discharge) L2=Exfiltration (Exfiltration Controls 0.03 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=99.49' (Free Discharge) I-' -1=Orifice/Grate (Controls 0.00 cfs) Pond P: SUMMATION POND Inflow Area = 11,772 sf, Inflow Depth > 0.52" for 2yr event Inflow = 0.25 cfs @ 11.97 hrs, Volume= 512 cf Primary = 0.25 cfs @ 11.97 hrs, Volume= 512 cf, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Drainage 9®25®06 Type,1124-hr 10yr Rainfall=4.50" Prepared by Christiansen & Sergi, Inc. Page 5 HydroCADO 7.10 s/n 001057 0 2005 HydroCAD Software Solutions LLC 1012/2006 Time spari=0.00-24.00 hrs, dt=0.01 hrs, 2401 points Runoff by SCS TR-20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment E: EXISTING CONDITIONS RunoffArea=11,823 sf Runoff Depth>1.60" Tc=6.0 min CN=69 Runoff=0.78 cfs 1,576 cf Subcatchment P1: P1 Runoff Area=7,923 sf Runoff Depth>3.39" Tc=6.0 min CN=90 Runoff=1.04 cfs 2,239 cf Subcatchment P2: P2 Runoff Area=3,849 sf Runoff Depth>2.81" Tc=6.0 min CN=84 Runoff=0.44 cfs 902 cf Pond C: CULTEC Peak Elev=102.34' Storage=1,159 cf Inflow=1.04 cfs 2,239 cf Discarded=0.03 cfs 1,746 cf Primary=0.00 cfs 0 cf Outflow=0.03 cfs 1,746 cf Pond P: SUMMATION POND Inflow=0.44 cfs 902 cf Primary=0.44 cfs 902 cf Total Runoff Area= 23,595 sf Runoff Volume=4,717 cf Average Runoff Depth = 2.40'° Drainage 9®2 -06 Type lI 24-hr 10yr Rainfall=4.50" Prepared by Christiansen 8, Sergi, Inc. Page 6 HydroCADO 7.10 s/n 001057 ©2005 HydroCAD Software Solutions LLC 10/2/2006 Subcatchment E: EXISTING DONDI T IONS Runoff = 0.78 cfs @ 11.98 hrs, Volume= 1,576 cf, Depth> 1.60" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Type II 24-hr 10yr Rainfall=4.50" Area (sf) CN Description 2,630 98 Paved parking & roofs 9,193 61 >75% Grass cover, Good, HSG S 11,823 69 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Min. Tc Subcatchment P1: P1 Runoff = 1.04 cfs @ 11.97 hrs, Volume= 2,239 cf, Depth> 3.39" Runoff by SCS TR-20 method, UH=SCS, Time Span=0.00-24.00 hrs, dt= 0.01 hrs Type 11 24-hr 10yr Rainfall=4.50" Area (sf, CN Description 6,288 98 PVMT AND ROOF 1,635 61 GRASS 7,923 90 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 132: P2 Runoff 0.44 cfs @ 11.97 hrs, Volume= 902 cf, Depth> 2.81" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Type II 24-hr 10yr Rainfall=4.50" Area (sf) CN Description 2,396 98 PVMT 1,453 61 GRASS 3,849 84 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Drainage 9-2 -06 Type //24-hr 10yr Rainfall=4.50" Prepared by Christiansen & Sergi, Inc. Page 7 HydroCADO 7.10 s/n 001057 ©2005 H droCAD Software Solutions LLC 10/2/2006 Pond C: CULTEC Inflow Area = 7,923 sf, Inflow Depth > 3.39" for 1 Oyr event Inflow = 1.04 cfs @ 11.97 hrs, Volume= 2,239 cf Outflow = 0.03 cfs @ 13.83 hrs, Volume= 1,746 cf, Atten= 97%, Lag= 111.6 min Discarded = 0.03 cfs @ 13.83 hrs, Volume= 1,746 cf Primary = 0.00 cfs @ 0.00 hrs, Volume= 0 cf Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Peak Elev= 102.34' @ 13.83 hrs Surf.Area= 708 sf Storage= 1,159 cf Plug-Flow detention time= 283.6 min calculated for 1,746 cf(78% of inflow) Center-of-Mass det. time= 199.9 min ( 990.3 - 790.4 ) Volume Invert Avail.Storage Storage Description #1 99.49' 901 cf Custom Stage Data (Prismatic) Listed below 2,840 cf Overall - 588 cf Embedded = 2,252 cf x 40.0% Voids #2 99.99' 588 cf 33.6"W x 20.0"H x 6.331 Cultec R-180 x 27 Inside#1 1,489 cf Total Available Storage Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 99.49 708 0 0 101.70 708 1,565 1,565 103.50 709 1,275 2,840 Device Routing Invert Outlet Devices #1 Primary 103.50' 0.17' x 0=17' Horiz. Orifir4e/Orate 72.00 Limited to weir flow G- 0.600 0.600 #2 Discarded 0.00' 2.000 in/hr Exfiltration over Surface area Discarded OutFlow Max=0.03 cfs @ 13.83 hrs HW=102.34` (Free Discharge) t-2=Exfiltration (Exfiltration Controls 0.03 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=99.49' (Free Discharge) t-1=Orifice/Grate ( Controls 0.00 cfs) Pond P: SUMMATION POND Inflow Area = 11,772 sf, Inflow Depth > 0.92" for 10yr event Inflow = 0.44 cfs @ 11.97 hrs, Volume= 902 cf Primary 0.44 cfs @ 11.97 hrs, Volume= 902 cf, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Drainage 9-25-06 Type 1124-hr 100yr Rainfall=6.50" Prepared by Christiansen & Sergi, Inc. Page 8 HydroCAIJ®7.10 s/n 001057 ©2005 HydroCAD Software Solutions LLC 10/2/2006 Time span=0.00-24.00 hrs, dt=0.01 hrs, 2401 points Runoff by SCS TR-20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment E: EXISTING CONDITIONS Runoff Area=11,823 sf Runoff Depth>3.10" Tc=6.0 min CN=69 Runoff=1.51 cfs 3,058 of Subcatchment P1: P1 Runoff Area=7,923 sf Runoff Depth>5.33" Tc=6.0 min CN=90 Runoff=1.58 cfs 3,518 of Subcatchment P2: P2 Runoff Area=3,849 sf Runoff Depth>4.66" Tc=6.0 min CN=84 Runoff=0.70 cfs 1,495 of Pond C: CULTEC Peak Elev=103.52' Storage=1,489 of Inflow=1.58 cfs 3,518 of Discarded=0.03 cfs 1,923 of Primary=0.77 cfs 551 of Outflow=0.81 cfs 2,474 of Pond P: SUMMATION POND Inflow=1.10 cfs 2,046 of Primary=1.10 cfs 2,046 of Total Runoff Area= 23,595 sf Runoff Volume=5,070 cf Average Runoff Depth =4.10" Drainage 9®25®06 Type 1l 24-hr 100yr Rainfall=6.50" Prepared by Christiansen &. Sergi, Inc. Page 9 HydroCAD®7.10 s/n 001057 0 2005 H droCAD Software Solutions LLC 10/2/2006 Subcatchment E: EXIST ING CONDITIONS Runoff = 1.51 cfs @ 11.97 hrs, Volume= 3,058 cf, Depth> 3.10" Runoff by SOS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Type II 24-hr 100yr Rainfall=6.50" Area (sf) CN Description 2,630 98 Paved parking & roofs 9,193 61 >75% Grass cover, Good, HSG B 11,823 69 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Min. Tc Subcatchment P1: P1 Runoff = 1.58 cfs @ 11.97 hrs, Volume= 3,518 cf, Depth> 5.33" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Type Il 24-hr 100yr Rainfall=6.50" Area (sf) CN Description 6,288 98 PVMT AND ROOF 1,635 61 GRASS 7,923 90 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment P2: P2 Runoff = 0.70 cfs @ 11.97 hrs, Volume= 1,495 cf, Depth> 4.66" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Type II 24-hr 100yr Rainfall=6.50" Area (sf) ON Description 2,396 98 PVMT 1,453 61 GRASS 3,849 84 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 i Direct Entry, Drainage 9-25-06 Type 1124-hr 100yr Rainfall=6.50" Prepared by Christiansen & Sergi, Inc. Page 10 HydroCADO 7.10 s/n 001057 0 2005 HydroCAD Software Solutions LLC 10/2/2006 Pond C: CULTEC Inflow Area = 7,923 sf, Inflow Depth > 5.33" for 100yr event Inflow = 1.58 cfs @ 11.97 hrs, Volume= 3,518 cf Outflow = 0.81 cfs @ 12.06 hrs, Volume= 2,474 cf, Atten=49%, lag= 5.8 min Discarded = 0.03 cfs @ 12.06 hrs, Volume= 1,923 of Primary = 0.77 cfs @ 12.06 hrs, Volume= 551 cf Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Peak Elev= 103.52' @ 12.06 hrs Surf.Area= 709 sf Storage= 1,489 cf Plug-Flow detention time= 218.8 min calculated for 2,473 cf(70% of inflow) Center-of-Mass det. time= 124.6 min ( 902.7-778.1 ) Volume Avail.Storage Storage Description #1 99.49' 901 cf Custom Stage Data(Prismatic) Listed below 2,840 cf Overall -588 cf Embedded = 2,252 cf x 40.0% Voids #2 99.99' 588 cf 33.6"W x 20.0"H x 6.33'L Cultec R-'180 x27 Inside#1 1,489 cf Total Available Storage Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 99.49 708 0 0 101.70 708 1,565 1,565 103.50 709 1,275 2,840 Device Routing Invert Outlet Devices #'i Primary 103.50' 0.17' x 9.17' Horixa Orifice/Grate X 72.00 Limited to weir flow C= 0.600 #2 Discarded 0.00' 2.000 in/hr Exfiltration over Surface area Discarded OutFlow Max=0.03 cfs @ 12.06 hrs HW=103.52' (Free Discharge) t--2=Exfiltration (Exfiltration Controls 0.03 cfs) Primary OutFlow Max=0.50 cfs @ 12.06 hrs HW=103.52' (Free Discharge) t--1=Orifice/G rate (Weir Controls 0.50 cfs @ 0.5 fps) Pond P: SUMMATION POND Inflow Area = 11,772 sf, Inflow Depth > 2.09" for 100yr event Inflow = 1.10 cfs @ 12.06 hrs, Volume= 2,046 cf Primary - 1.10 cfs @ 12.06 hrs, Volume= 2,046 cf, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs im smom mamummmmm Own Ch C6 U) cc) 0 cq CD C' CD 00, 4:5 CD (5 > (NA cq CtS C� C:� Ok N Ej S,L CHARLTON F— Ljj V) C-) 05- Q) C)I\q (MY) 0 - L D.- C, 71L wl CD 0 k Zl co CD .i CD 4-il to CD L C-li ft's _) Q) CD Q) W Lr) CD in uoumuu®o®�mmvunium,uuu��u�uwa�uumurunuouuuuuunuuuuoo®wouuunuou�m®uuusi®uum nuuucu�uu�uuummmsuroeuusumuuut®®tumuin�ormo�inoamiomom®re��iouoiu®uw omnm nouu�ouu a r 4 , J mom i am. 6V------•.—S—"--I ° mum �ol'� a m 91, �lln 121 I"1 I� �I C6 CIS CT Cr) CJa''" O� —� CD R i_ nCl Q i I Cj ;� f l 2.•_ f CX :5 Lj J ,tai y i �`" cq�. C) I• 41 c1 -1 .� CANWt l J�_ S.L . � ��,,, 1•rC 0 �HI. JON t.. c� / - cx Blom 1(Y4 I aCl�P 1 � I CJ mmnu�nm a Lf) CL mm "� CD O L') C) a l!� 1G � aamul�er.�u�mum�r:�eiearm�a�uemoe�p�o�euuom�maL��r�LOt�u�wLm�iumutio3�smm�u�a�wov®�mav®ma®mimm�ua �ct�ofwo�uw�wauriaan� um�r;mmraeaLmm�i�u�wa�os�anu��io�®w®ma�a®.mmw�umlu�uowm