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HomeMy WebLinkAboutStormwater Report - 163 MAIN STREET 9/27/2006 ����N��N������ �� �����0 INC.�mvmvm~� nm��n���m�w� �� ~���mm��mn mn��� PROFESSIONAL ENGINEERS AND LAND SURVEYORS l6O SUMMER STRE[T HAVERH|LL' MASSACHUSETTS 01830-6318 (978)373'0310 FAX: (97E)372-3960 Project No.: 06.103 September 27. 2OOG Mr. Scott L. Giles, P.L.S. 50 Deenneadow Road North Andover, W1AO1845 RE: Drainage Analysis-Main Street, North Andover Dear Mr. Giles: Per your request vve have prepared a drainage analysis for the project si|eonKUain8beetin North Andover. Drainage calculations were performed using the SCS Method. Model parameters were developed using topographic information provided on a plan titled, "Plat) of Land in North Andover, Mass. Owned by Michael l Foster and Stephen M. Sullivan"dated September 8. 2OUG and revised through September 13. 2OO8. prepared bv 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 "Charlton and Canton Fine 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 1 00-year design storms in the table below: | Qpeak Qpeak � � Post-Development ' cmo�U�u Comd�os i | ' (Cfe) [- --------------- / i Storm Event U�3 . O25 ' �1"�4�r [ � � | | � | I Storm Event 078 | 0.44 L | (4.5"/24-h4 | | | '— ------------ --- |--------� -�------- -�--------- -- - 1 Storm Event � 151 1.51 ` ^ | � � ! | ' � with this letter. Should you have any questions or comments please |free to contact nD6at the number listed above. PHILIP G. cc) CNI 1:7 / - Christian en, . E ? ( P1 EXISTING P1 CONDITIONS P2 CULT C /P2 SUMMATION POND Subcatj Reach [Link! Drainage Diagram for Drainage 9-2"6 ^� -----' Prepared by Christiansen&Sergi, Inc. 9/26/2006 FHydroCAD(@ 7.10 s/n 001057 ©2005 HydroCAD Software Solutions LLC Drainage 9®25-06 Type //24-hr 2yr Rainfall=3.10" Prepared by Christiansen & Sergi, Inc. Page 2 HydroCAD®7.10 s/n 001057 0 2005 HydroCAD Software Solutions LLC 9/26/2006 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>2.16" Tc=6.0 min CN=91 Runoff=0.67 cfs 1,427 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=100.94' Storage=656 cf Inflow=0.67 cfs 1,427 cf Discarded=0.03 cfs 1,425 cf Primary=0.00 cfs 0 cf Outflow=0.03 cfs 1,425 cf Pond P: SUMMATION POND Inflow=0.25 cfs 512 cf Primary=0.25 cfs 512 cf Total Runoff Area= 23,595 sf Runoff Volume=2,651 cf Average Runoff Depth = 1.35" Drainage 9-25-06 Type 1124-hr 2yr Rainfall=3.10" Prepared by Christiansen & Sergi, Inc. Page 3 HydroCAD®7.10 s/n 001057 0 2005 H drroCAD Software Solutions LLC 9/26/2006 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 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 = 0.67 cfs @ 11.97 hrs, Volume= 1,427 cf, Depth> 2.16" 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 6,414 98 PVMT AND ROOF 1,509 61 GRASS 7,923 9-1 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 132: 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 1 Direct Entry, Drainage 9-25-06 Type 1124-hr 2yr Rainfall=3.10" Prepared by Christiansen & Sergi, Inc. Page 4 HydroCAD®7.10 s/n 001057 ©2005 HydroCAD Software Solutions LLC 9/26/2006 Pond C: CULTEC Inflow Area 7,923 sf, Inflow Depth > 2.16" for 2yr event Inflow = 0.67 cfs @ 11.97 hrs, Volume= 1,427 cf Outflow = 0.03 cfs @ 11.43 hrs, Volume= 1,425 cf, Atten= 95%, Lag= 0.0 min Discarded = 0.03 cfs @ 11.43 hrs, Volume= 1,425 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= 100.94' @ 13.04 hrs Surf.Area= 708 sf Storage= 656 cf Plug-Flow detention time= 171.0 min calculated for 1,425 cf(100% of inflow) Center-of-Mass det. time= 170.1 min ( 969.8 - 799.7) 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 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 (touting Invert Outlet Devices -- #1 Primary 103.50' 0.17' x 0.172 Horiz. Orific€,/Grate X 72,00 Limited to weir flo'0.1 C= 0.000 #2 Discarded 0.00' 2.000 in/hr Exfiltration over Surface area Discarded OutFlow Max=0.03 cfs @ 11.43 hrs HW=99.53' (Free Discharge) t- 2=Exfiltration (Exfiltration Controls 0.03 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=99.49' (Free Discharge) t1=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 11 24-hr 10yr Rainfall=4.50" Prepared by Christiansen & Sergi, Inc. Page 6 HydroCADO 7.10 s/n 001057 0 2005 HydroCAD Software Solutions LLC 9/26/2006 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>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>3.49" Tc=6.0 min CN=91 Runoff=1.06 cfs 2,307 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=102.47' Storage=1,197 cf Inflow=1.06 cfs 2,307 cf Discarded=0.03 cfs 1,771 cf Primary=0.00 cfs 0 cf Outflow=0.03 cfs 1,771 cf Pond P: SUMMATION POND Inflow=0.44 cfs 902 cf Primary=0.44 CTS 902 cf Total Runoff Area= 23,595 sf Runoff Volume= 4,755 cf Average Runoff Depth= 2.43" Drainage 9-25-06 Type 11 24-hr 10yr Rainfall=4.50" Prepared by Christiansen & Sergi, Inc. Page 6 HydroCADO 7.10 s/n 001057 ©2005 HydroCAD Software Solutions LLC 9/26/2006 Subcatchment E: EXISTING CONDITIONS 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 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 = 1.06 cfs @ 11.97 hrs, Volume= 2,307 cf, Depth> 3.49" 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 6,414 98 PVMT AND ROOF 1,509 61 GRASS 7,923 91 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment P2: 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 9-25-06 Type /124-hr 10yr Rainfall=4.50" Prepared by Christiansen & Sergi, Inc. Page 7 HydroCADO 7.10 s/n 001057 0 2005 HydroCAD Software Solutions LLC 9/26/2006 Pond G: OULTPO Inflow Area = 7,923 sf, Inflow Depth > 3.49" for 10yr event Inflow = 1.06 cfs @ 11.97 hrs, Volume= 2,307 cf Outflow = 0.03 cfs @ 13.85 hrs, Volume= 1,771 cf, Aften- 97%, Lag= 113.0 min Discarded = 0.03 cfs @ 13.85 hrs, Volume= 1,771 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= 102.47' @ 13.85 hrs Surf.Area= 708 sf Storage= 1,197 cf Plug:-Flow detention time= 282.5 min calculated for 1,771 cf(77% of inflow) Center-of-Mass det. time= 196.9 min ( 983.2 - 786.3 ) 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 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 --#1 Primary 103.50' 0.17' x 0.17' Horiz. Orifice/Crate 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 @ 13.85 hrs HW=102.47' (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=Orif ice/G rate ( 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 11 24-hr 100yr Rainfall=6.50" Prepared by Christiansen & Sergi, Inc. Page 8 HydroCADO 7.10 s/n 001057 ©2005 HydroCAD Software Solutions LLC 9/26/2006 Tirne 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=1 1,823 sf Runoff Depth>3.10" Tc=6.0 min CN=69 Runoff=1.51 cfs 3,058 cf Subcatchment P1: P1 Runoff Area=7,923 sf Runoff Depth>5.44" Tc=6.0 min CN=91 Runoff=1.60 cfs 3,593 cf Subcatchment P2: P2 Runoff Area=3,849 sf Runoff Depth>4.66" Tc=6.0 min CN=84 Runoff=0.70 cfs 1,495 cf Pond C: CULTEC Weak Elev=103.53' Storage=1,489 cf Inflow=1.60 cfs 3,593 cf Discarded=0.03 cfs 1,953 cf Primary=1.12 cfs 593 cf Outflow=1.15 cfs 2,546 cf Pond P: SUMMATION POND Inflow=1.51 cfs 2,088 cf Primary=1.51 cfs 2,088 cf Total Runoff Area=23,595 sf Runoff Volume=8,145 cf Average Runoff Depth =4.14" 1 Ummauli mma r.MMUMN mmimwi,Mmom 01 Qt Ww i aye Al 7! 00 eaF y�S C5 as I ---- P o "I NI 10 101 C> to -01K locl-- Ln J I c_7 R 10 CX C� (Z) LI CD R2 OA- C� Q) Q-) ANTON CHARLTV4 F-S pl 103" CD (Y) 00 CD `,D CD lz Lf) Lr) i II C) fv) o L6 co Lr) -'1199@ loll®®�YS1i�91®�1J®6��9®91191?'a1®��IOl�lfl@9990��tli110E1911� �tlN�1191�A0111 IPdI®®®A®®IIII�OGBI�lell78�1®®A6YIIY INIII��IINLYmA®01�® ®OCWmll011®Ilel S 3 � �� � T Q 1 N (Y) I6 od n_ CD �. 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