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HomeMy WebLinkAboutDrainage Report - Miscellaneous - 327 SALEM STREET 6/2/2023 2S_1P 1S_E House Roof + Porch Roof 1L 1P Predevelopment (offsite) 2S_2P Infiltration Field Remaining Site Area 2L Postdevelopment (offsite) Drainage Diagram for 335 Salem Street Reach SubcatPond Link Prepared by Sullivan Engineering Group, LLC 6/2/2023 HydroCAD® 7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems Type III 24-hr 2 yr Rainfall=3.20" 335 Salem Street Page 2 Prepared by Sullivan Engineering Group, LLC HydroCAD® 7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems 6/2/2023 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 Runoff Area=25,360 sf Runoff Depth=0.08" Subcatchment 1S_E: Tc=6.0 min CN=49 Runoff=0.01 cfs 178 cf Runoff Area=1,826 sf Runoff Depth=2.77" Subcatchment 2S_1P: House Roof + Porch Roof Tc=6.0 min CN=98 Runoff=0.13 cfs 422 cf Runoff Area=23,534 sf Runoff Depth=0.04" Subcatchment 2S_2P: Remaining Site Area Tc=6.0 min CN=46 Runoff=0.00 cfs 80 cf Peak Elev=94.52' Storage=20 cf Inflow=0.13 cfs 422 cf Pond 1P: Infiltration Field Outflow=0.08 cfs 422 cf Inflow=0.01 cfs 178 cf Link 1L: Predevelopment (offsite) Primary=0.01 cfs 178 cf Inflow=0.00 cfs 80 cf Link 2L: Postdevelopment (offsite) Primary=0.00 cfs 80 cf Total Runoff Area = 50,720 sf Runoff Volume = 679 cf Average Runoff Depth = 0.16" Type III 24-hr 2 yr Rainfall=3.20" 335 Salem Street Page 3 Prepared by Sullivan Engineering Group, LLC HydroCAD® 7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems 6/2/2023 Subcatchment 1S_E: Runoff=0.01 cfs @ 13.67 hrs, Volume=178 cf, Depth=0.08" 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)CNDescription 25,3604950-75% Grass cover, Fair, HSG A TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 6.0 Direct Entry, direct Subcatchment 1S_E: Hydrograph Runoff 0.009 0.01 cfs 0.009 Type III 24-hr 2 yr 0.008 0.008 Rainfall=3.20" 0.007 0.007 Runoff Area=25,360 sf 0.006 0.006 Runoff Volume=178 cf 0.005 0.005 Runoff Depth=0.08" 0.004 Flow (cfs) Tc=6.0 min 0.004 0.003 CN=49 0.003 0.002 0.002 0.001 0.001 0.000 0 567891011121314151617181920 Time (hours) Type III 24-hr 2 yr Rainfall=3.20" 335 Salem Street Page 4 Prepared by Sullivan Engineering Group, LLC HydroCAD® 7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems 6/2/2023 Subcatchment 2S_1P: House Roof + Porch Roof Runoff=0.13 cfs @ 12.09 hrs, Volume=422 cf, Depth=2.77" 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)CNDescription 1,77698Roof Area of House 5098Porch Roof 1,82698Weighted Average TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 6.0 Direct Entry, Direct Subcatchment 2S_1P: House Roof + Porch Roof Hydrograph 0.14 Runoff 0.13 cfs 0.13 Type III 24-hr 2 yr 0.12 0.11 Rainfall=3.20" 0.1 Runoff Area=1,826 sf 0.09 Runoff Volume=422 cf 0.08 0.07 Runoff Depth=2.77" Flow (cfs) 0.06 Tc=6.0 min 0.05 CN=98 0.04 0.03 0.02 0.01 0 567891011121314151617181920 Time (hours) Type III 24-hr 2 yr Rainfall=3.20" 335 Salem Street Page 5 Prepared by Sullivan Engineering Group, LLC HydroCAD® 7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems 6/2/2023 Subcatchment 2S_2P: Remaining Site Area Runoff=0.00 cfs @ 15.05 hrs, Volume=80 cf, Depth=0.04" 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)CNDescription 69098paved driveway 4098walkway 11,15039>75% Grass cover, Good, HSG A 11,6544950-75% Grass cover, Fair, HSG A 23,53446Weighted Average TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 6.0 Direct Entry, direct Subcatchment 2S_2P: Remaining Site Area Hydrograph Runoff 0.004 0.00 cfs 0.004 0.004 Type III 24-hr 2 yr 0.004 0.004 Rainfall=3.20" 0.003 0.003 Runoff Area=23,534 sf 0.003 0.003 Runoff Volume=80 cf 0.003 0.002 Runoff Depth=0.04" 0.002 0.002 Flow (cfs) Tc=6.0 min 0.002 0.002 CN=46 0.001 0.001 0.001 0.001 0.001 0.000 0.000 0 567891011121314151617181920 Time (hours) Type III 24-hr 2 yr Rainfall=3.20" 335 Salem Street Page 6 Prepared by Sullivan Engineering Group, LLC HydroCAD® 7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems 6/2/2023 Pond 1P: Infiltration Field Rawls Rate = 8.27 in/hr Inflow Area =1,826 sf, Inflow Depth = 2.77" for 2 yr event Inflow=0.13 cfs @ 12.09 hrs, Volume=422 cf Outflow=0.08 cfs @ 12.05 hrs, Volume=422 cf, Atten= 35%, Lag= 0.0 min Discarded=0.08 cfs @ 12.05 hrs, Volume=422 cf Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 94.52' @ 12.18 hrs Surf.Area= 430 sf Storage= 20 cf Plug-Flow detention time= 1.2 min calculated for 421 cf (100% of inflow) Center-of-Mass det. time= 1.0 min ( 739.6 - 738.6 ) #InvertAvail.StorageStorage Description 194.40'280 cf 10.49'W x 41.00'L x 1.67'H Prismatoid 718 cf Overall - 19 cf Embedded = 700 cf x 40.0% Voids 294.90'19 cf x 30 Inside #1 2.8"W x 12.0"H x 4.00'L Parabolic Arch 299 cfTotal Available Storage #RoutingInvertOutlet Devices 1Discarded0.00' 0.011480 fpm Exfiltration over entire Surface area Max=0.08 cfs @ 12.05 hrs HW=94.44' (Free Discharge) Discarded OutFlow (Exfiltration Controls 0.08 cfs) 1=Exfiltration Pond 1P: Infiltration Field Hydrograph Inflow Discarded 0.13 cfs 0.14 0.13 Inflow Area=1,826 sf 0.12 Peak Elev=94.52' 0.11 0.1 Storage=20 cf 0.09 0.08 cfs 0.08 0.07 Flow (cfs) 0.06 0.05 0.04 0.03 0.02 0.01 0 567891011121314151617181920 Time (hours) Type III 24-hr 2 yr Rainfall=3.20" 335 Salem Street Page 7 Prepared by Sullivan Engineering Group, LLC HydroCAD® 7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems 6/2/2023 Link 1L: Predevelopment (offsite) Inflow Area =25,360 sf, Inflow Depth = 0.08" for 2 yr event Inflow=0.01 cfs @ 13.67 hrs, Volume=178 cf Primary=0.01 cfs @ 13.67 hrs, Volume=178 cf, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Link 1L: Predevelopment (offsite) Hydrograph Inflow Primary 0.01 cfs 0.009 0.01 cfs 0.009 Inflow Area=25,360 sf 0.008 0.008 0.007 0.007 0.006 0.006 0.005 0.005 0.004 Flow (cfs) 0.004 0.003 0.003 0.002 0.002 0.001 0.001 0.000 0 567891011121314151617181920 Time (hours) Type III 24-hr 2 yr Rainfall=3.20" 335 Salem Street Page 8 Prepared by Sullivan Engineering Group, LLC HydroCAD® 7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems 6/2/2023 Link 2L: Postdevelopment (offsite) Inflow Area =23,534 sf, Inflow Depth = 0.04" for 2 yr event Inflow=0.00 cfs @ 15.05 hrs, Volume=80 cf Primary=0.00 cfs @ 15.05 hrs, Volume=80 cf, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Link 2L: Postdevelopment (offsite) Hydrograph Inflow Primary 0.00 cfs 0.004 0.00 cfs 0.004 Inflow Area=23,534 sf 0.004 0.004 0.004 0.003 0.003 0.003 0.003 0.003 0.002 0.002 0.002 Flow (cfs) 0.002 0.002 0.001 0.001 0.001 0.001 0.001 0.000 0.000 0 567891011121314151617181920 Time (hours) Type III 24-hr 10 yr Rainfall=4.80" 335 Salem Street Page 9 Prepared by Sullivan Engineering Group, LLC HydroCAD® 7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems 6/2/2023 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 Runoff Area=25,360 sf Runoff Depth=0.49" Subcatchment 1S_E: Tc=6.0 min CN=49 Runoff=0.20 cfs 1,029 cf Runoff Area=1,826 sf Runoff Depth=4.24" Subcatchment 2S_1P: House Roof + Porch Roof Tc=6.0 min CN=98 Runoff=0.19 cfs 645 cf Runoff Area=23,534 sf Runoff Depth=0.36" Subcatchment 2S_2P: Remaining Site Area Tc=6.0 min CN=46 Runoff=0.10 cfs 705 cf Peak Elev=94.79' Storage=67 cf Inflow=0.19 cfs 645 cf Pond 1P: Infiltration Field Outflow=0.08 cfs 645 cf Inflow=0.20 cfs 1,029 cf Link 1L: Predevelopment (offsite) Primary=0.20 cfs 1,029 cf Inflow=0.10 cfs 705 cf Link 2L: Postdevelopment (offsite) Primary=0.10 cfs 705 cf Total Runoff Area = 50,720 sf Runoff Volume = 2,378 cf Average Runoff Depth = 0.56" Type III 24-hr 10 yr Rainfall=4.80" 335 Salem Street Page 10 Prepared by Sullivan Engineering Group, LLC HydroCAD® 7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems 6/2/2023 Subcatchment 1S_E: Runoff=0.20 cfs @ 12.15 hrs, Volume=1,029 cf, Depth=0.49" 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)CNDescription 25,3604950-75% Grass cover, Fair, HSG A TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 6.0 Direct Entry, direct Subcatchment 1S_E: Hydrograph Runoff 0.21 0.20 cfs 0.2 Type III 24-hr 10 yr 0.19 0.18 Rainfall=4.80" 0.17 0.16 Runoff Area=25,360 sf 0.15 0.14 Runoff Volume=1,029 cf 0.13 0.12 Runoff Depth=0.49" 0.11 0.1 Tc=6.0 min Flow (cfs) 0.09 0.08 CN=49 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 567891011121314151617181920 Time (hours) Type III 24-hr 10 yr Rainfall=4.80" 335 Salem Street Page 11 Prepared by Sullivan Engineering Group, LLC HydroCAD® 7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems 6/2/2023 Subcatchment 2S_1P: House Roof + Porch Roof Runoff=0.19 cfs @ 12.09 hrs, Volume=645 cf, Depth=4.24" 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)CNDescription 1,77698Roof Area of House 5098Porch Roof 1,82698Weighted Average TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 6.0 Direct Entry, Direct Subcatchment 2S_1P: House Roof + Porch Roof Hydrograph Runoff 0.21 0.19 cfs 0.2 0.19 Type III 24-hr 10 yr 0.18 0.17 Rainfall=4.80" 0.16 0.15 Runoff Area=1,826 sf 0.14 0.13 Runoff Volume=645 cf 0.12 0.11 Runoff Depth=4.24" 0.1 Flow (cfs) 0.09 Tc=6.0 min 0.08 0.07 CN=98 0.06 0.05 0.04 0.03 0.02 0.01 0 567891011121314151617181920 Time (hours) Type III 24-hr 10 yr Rainfall=4.80" 335 Salem Street Page 12 Prepared by Sullivan Engineering Group, LLC HydroCAD® 7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems 6/2/2023 Subcatchment 2S_2P: Remaining Site Area Runoff=0.10 cfs @ 12.30 hrs, Volume=705 cf, Depth=0.36" 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)CNDescription 69098paved driveway 4098walkway 11,15039>75% Grass cover, Good, HSG A 11,6544950-75% Grass cover, Fair, HSG A 23,53446Weighted Average TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 6.0 Direct Entry, direct Subcatchment 2S_2P: Remaining Site Area Hydrograph Runoff 0.11 0.10 cfs 0.105 0.1 Type III 24-hr 10 yr 0.095 0.09 Rainfall=4.80" 0.085 0.08 Runoff Area=23,534 sf 0.075 0.07 Runoff Volume=705 cf 0.065 0.06 Runoff Depth=0.36" 0.055 0.05 Flow (cfs) Tc=6.0 min 0.045 0.04 0.035 CN=46 0.03 0.025 0.02 0.015 0.01 0.005 0 567891011121314151617181920 Time (hours) Type III 24-hr 10 yr Rainfall=4.80" 335 Salem Street Page 13 Prepared by Sullivan Engineering Group, LLC HydroCAD® 7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems 6/2/2023 Pond 1P: Infiltration Field Rawls Rate = 8.27 in/hr Inflow Area =1,826 sf, Inflow Depth = 4.24" for 10 yr event Inflow=0.19 cfs @ 12.09 hrs, Volume=645 cf Outflow=0.08 cfs @ 11.95 hrs, Volume=645 cf, Atten= 57%, Lag= 0.0 min Discarded=0.08 cfs @ 11.95 hrs, Volume=645 cf Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 94.79' @ 12.28 hrs Surf.Area= 430 sf Storage= 67 cf Plug-Flow detention time= (not calculated: outflow precedes inflow) Center-of-Mass det. time= (not calculated) #InvertAvail.StorageStorage Description 194.40'280 cf 10.49'W x 41.00'L x 1.67'H Prismatoid 718 cf Overall - 19 cf Embedded = 700 cf x 40.0% Voids 294.90'19 cf x 30 Inside #1 2.8"W x 12.0"H x 4.00'L Parabolic Arch 299 cfTotal Available Storage #RoutingInvertOutlet Devices 1Discarded0.00' 0.011480 fpm Exfiltration over entire Surface area Max=0.08 cfs @ 11.95 hrs HW=94.42' (Free Discharge) Discarded OutFlow (Exfiltration Controls 0.08 cfs) 1=Exfiltration Pond 1P: Infiltration Field Hydrograph Inflow Discarded 0.19 cfs 0.21 0.2 Inflow Area=1,826 sf 0.19 0.18 Peak Elev=94.79' 0.17 0.16 Storage=67 cf 0.15 0.14 0.13 0.12 0.11 0.1 Flow (cfs)0.08 cfs 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 567891011121314151617181920 Time (hours) Type III 24-hr 10 yr Rainfall=4.80" 335 Salem Street Page 14 Prepared by Sullivan Engineering Group, LLC HydroCAD® 7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems 6/2/2023 Link 1L: Predevelopment (offsite) Inflow Area =25,360 sf, Inflow Depth = 0.49" for 10 yr event Inflow=0.20 cfs @ 12.15 hrs, Volume=1,029 cf Primary=0.20 cfs @ 12.15 hrs, Volume=1,029 cf, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Link 1L: Predevelopment (offsite) Hydrograph Inflow Primary 0.20 cfs 0.21 0.20 cfs 0.2 Inflow Area=25,360 sf 0.19 0.18 0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.1 Flow (cfs) 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 567891011121314151617181920 Time (hours) Type III 24-hr 10 yr Rainfall=4.80" 335 Salem Street Page 15 Prepared by Sullivan Engineering Group, LLC HydroCAD® 7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems 6/2/2023 Link 2L: Postdevelopment (offsite) Inflow Area =23,534 sf, Inflow Depth = 0.36" for 10 yr event Inflow=0.10 cfs @ 12.30 hrs, Volume=705 cf Primary=0.10 cfs @ 12.30 hrs, Volume=705 cf, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Link 2L: Postdevelopment (offsite) Hydrograph Inflow Primary 0.10 cfs 0.11 0.10 cfs 0.105 Inflow Area=23,534 sf 0.1 0.095 0.09 0.085 0.08 0.075 0.07 0.065 0.06 0.055 0.05 Flow (cfs) 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 0.005 0 567891011121314151617181920 Time (hours) Type III 24-hr 25 yr Rainfall=6.00" 335 Salem Street Page 16 Prepared by Sullivan Engineering Group, LLC HydroCAD® 7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems 6/2/2023 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 Runoff Area=25,360 sf Runoff Depth=0.95" Subcatchment 1S_E: Tc=6.0 min CN=49 Runoff=0.55 cfs 2,008 cf Runoff Area=1,826 sf Runoff Depth=5.33" Subcatchment 2S_1P: House Roof + Porch Roof Tc=6.0 min CN=98 Runoff=0.24 cfs 811 cf Runoff Area=23,534 sf Runoff Depth=0.76" Subcatchment 2S_2P: Remaining Site Area Tc=6.0 min CN=46 Runoff=0.35 cfs 1,489 cf Peak Elev=95.06' Storage=116 cf Inflow=0.24 cfs 811 cf Pond 1P: Infiltration Field Outflow=0.08 cfs 811 cf Inflow=0.55 cfs 2,008 cf Link 1L: Predevelopment (offsite) Primary=0.55 cfs 2,008 cf Inflow=0.35 cfs 1,489 cf Link 2L: Postdevelopment (offsite) Primary=0.35 cfs 1,489 cf Total Runoff Area = 50,720 sf Runoff Volume = 4,307 cf Average Runoff Depth = 1.02" Type III 24-hr 25 yr Rainfall=6.00" 335 Salem Street Page 17 Prepared by Sullivan Engineering Group, LLC HydroCAD® 7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems 6/2/2023 Subcatchment 1S_E: Runoff=0.55 cfs @ 12.11 hrs, Volume=2,008 cf, Depth=0.95" 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)CNDescription 25,3604950-75% Grass cover, Fair, HSG A TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 6.0 Direct Entry, direct Subcatchment 1S_E: Hydrograph Runoff 0.6 0.55 cfs 0.55 Type III 24-hr 25 yr 0.5 Rainfall=6.00" 0.45 Runoff Area=25,360 sf 0.4 Runoff Volume=2,008 cf 0.35 Runoff Depth=0.95" 0.3 Tc=6.0 min Flow (cfs) 0.25 CN=49 0.2 0.15 0.1 0.05 0 567891011121314151617181920 Time (hours) Type III 24-hr 25 yr Rainfall=6.00" 335 Salem Street Page 18 Prepared by Sullivan Engineering Group, LLC HydroCAD® 7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems 6/2/2023 Subcatchment 2S_1P: House Roof + Porch Roof Runoff=0.24 cfs @ 12.09 hrs, Volume=811 cf, Depth=5.33" 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)CNDescription 1,77698Roof Area of House 5098Porch Roof 1,82698Weighted Average TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 6.0 Direct Entry, Direct Subcatchment 2S_1P: House Roof + Porch Roof Hydrograph Runoff 0.26 0.24 cfs 0.24 Type III 24-hr 25 yr 0.22 Rainfall=6.00" 0.2 Runoff Area=1,826 sf 0.18 0.16 Runoff Volume=811 cf 0.14 Runoff Depth=5.33" 0.12 Flow (cfs) Tc=6.0 min 0.1 CN=98 0.08 0.06 0.04 0.02 0 567891011121314151617181920 Time (hours) Type III 24-hr 25 yr Rainfall=6.00" 335 Salem Street Page 19 Prepared by Sullivan Engineering Group, LLC HydroCAD® 7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems 6/2/2023 Subcatchment 2S_2P: Remaining Site Area Runoff=0.35 cfs @ 12.12 hrs, Volume=1,489 cf, Depth=0.76" 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)CNDescription 69098paved driveway 4098walkway 11,15039>75% Grass cover, Good, HSG A 11,6544950-75% Grass cover, Fair, HSG A 23,53446Weighted Average TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 6.0 Direct Entry, direct Subcatchment 2S_2P: Remaining Site Area Hydrograph Runoff 0.38 0.35 cfs 0.36 Type III 24-hr 25 yr 0.34 0.32 Rainfall=6.00" 0.3 0.28 Runoff Area=23,534 sf 0.26 Runoff Volume=1,489 cf 0.24 0.22 Runoff Depth=0.76" 0.2 0.18 Tc=6.0 min Flow (cfs) 0.16 CN=46 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 567891011121314151617181920 Time (hours) Type III 24-hr 25 yr Rainfall=6.00" 335 Salem Street Page 20 Prepared by Sullivan Engineering Group, LLC HydroCAD® 7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems 6/2/2023 Pond 1P: Infiltration Field Rawls Rate = 8.27 in/hr Inflow Area =1,826 sf, Inflow Depth = 5.33" for 25 yr event Inflow=0.24 cfs @ 12.09 hrs, Volume=811 cf Outflow=0.08 cfs @ 11.85 hrs, Volume=811 cf, Atten= 66%, Lag= 0.0 min Discarded=0.08 cfs @ 11.85 hrs, Volume=811 cf Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 95.06' @ 12.36 hrs Surf.Area= 430 sf Storage= 116 cf Plug-Flow detention time= (not calculated: outflow precedes inflow) Center-of-Mass det. time= (not calculated) #InvertAvail.StorageStorage Description 194.40'280 cf 10.49'W x 41.00'L x 1.67'H Prismatoid 718 cf Overall - 19 cf Embedded = 700 cf x 40.0% Voids 294.90'19 cf x 30 Inside #1 2.8"W x 12.0"H x 4.00'L Parabolic Arch 299 cfTotal Available Storage #RoutingInvertOutlet Devices 1Discarded0.00' 0.011480 fpm Exfiltration over entire Surface area Max=0.08 cfs @ 11.85 hrs HW=94.42' (Free Discharge) Discarded OutFlow (Exfiltration Controls 0.08 cfs) 1=Exfiltration Pond 1P: Infiltration Field Hydrograph Inflow Discarded 0.24 cfs 0.26 Inflow Area=1,826 sf 0.24 0.22 Peak Elev=95.06' 0.2 Storage=116 cf 0.18 0.16 0.14 0.12 Flow (cfs) 0.1 0.08 cfs 0.08 0.06 0.04 0.02 0 567891011121314151617181920 Time (hours) Type III 24-hr 25 yr Rainfall=6.00" 335 Salem Street Page 21 Prepared by Sullivan Engineering Group, LLC HydroCAD® 7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems 6/2/2023 Link 1L: Predevelopment (offsite) Inflow Area =25,360 sf, Inflow Depth = 0.95" for 25 yr event Inflow=0.55 cfs @ 12.11 hrs, Volume=2,008 cf Primary=0.55 cfs @ 12.11 hrs, Volume=2,008 cf, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Link 1L: Predevelopment (offsite) Hydrograph Inflow Primary 0.55 cfs 0.6 0.55 cfs Inflow Area=25,360 sf 0.55 0.5 0.45 0.4 0.35 0.3 Flow (cfs) 0.25 0.2 0.15 0.1 0.05 0 567891011121314151617181920 Time (hours) Type III 24-hr 25 yr Rainfall=6.00" 335 Salem Street Page 22 Prepared by Sullivan Engineering Group, LLC HydroCAD® 7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems 6/2/2023 Link 2L: Postdevelopment (offsite) Inflow Area =23,534 sf, Inflow Depth = 0.76" for 25 yr event Inflow=0.35 cfs @ 12.12 hrs, Volume=1,489 cf Primary=0.35 cfs @ 12.12 hrs, Volume=1,489 cf, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Link 2L: Postdevelopment (offsite) Hydrograph Inflow Primary 0.35 cfs 0.38 0.35 cfs 0.36 Inflow Area=23,534 sf 0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 Flow (cfs) 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 567891011121314151617181920 Time (hours) Type III 24-hr 100 yr Rainfall=8.60" 335 Salem Street Page 23 Prepared by Sullivan Engineering Group, LLC HydroCAD® 7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems 6/2/2023 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 Runoff Area=25,360 sf Runoff Depth=2.28" Subcatchment 1S_E: Tc=6.0 min CN=49 Runoff=1.56 cfs 4,816 cf Runoff Area=1,826 sf Runoff Depth=7.69" Subcatchment 2S_1P: House Roof + Porch Roof Tc=6.0 min CN=98 Runoff=0.35 cfs 1,170 cf Runoff Area=23,534 sf Runoff Depth=1.96" Subcatchment 2S_2P: Remaining Site Area Tc=6.0 min CN=46 Runoff=1.21 cfs 3,843 cf Peak Elev=95.78' Storage=249 cf Inflow=0.35 cfs 1,170 cf Pond 1P: Infiltration Field Outflow=0.08 cfs 1,170 cf Inflow=1.56 cfs 4,816 cf Link 1L: Predevelopment (offsite) Primary=1.56 cfs 4,816 cf Inflow=1.21 cfs 3,843 cf Link 2L: Postdevelopment (offsite) Primary=1.21 cfs 3,843 cf Total Runoff Area = 50,720 sf Runoff Volume = 9,828 cf Average Runoff Depth = 2.33" Type III 24-hr 100 yr Rainfall=8.60" 335 Salem Street Page 24 Prepared by Sullivan Engineering Group, LLC HydroCAD® 7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems 6/2/2023 Subcatchment 1S_E: Runoff=1.56 cfs @ 12.10 hrs, Volume=4,816 cf, Depth=2.28" 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)CNDescription 25,3604950-75% Grass cover, Fair, HSG A TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 6.0 Direct Entry, direct Subcatchment 1S_E: Hydrograph Runoff 1.56 cfs Type III 24-hr 100 yr Rainfall=8.60" Runoff Area=25,360 sf Runoff Volume=4,816 cf 1 Runoff Depth=2.28" Tc=6.0 min Flow (cfs) CN=49 0 567891011121314151617181920 Time (hours) Type III 24-hr 100 yr Rainfall=8.60" 335 Salem Street Page 25 Prepared by Sullivan Engineering Group, LLC HydroCAD® 7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems 6/2/2023 Subcatchment 2S_1P: House Roof + Porch Roof Runoff=0.35 cfs @ 12.09 hrs, Volume=1,170 cf, Depth=7.69" 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)CNDescription 1,77698Roof Area of House 5098Porch Roof 1,82698Weighted Average TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 6.0 Direct Entry, Direct Subcatchment 2S_1P: House Roof + Porch Roof Hydrograph 0.38 Runoff 0.35 cfs 0.36 0.34 Type III 24-hr 100 yr 0.32 Rainfall=8.60" 0.3 0.28 Runoff Area=1,826 sf 0.26 0.24 Runoff Volume=1,170 cf 0.22 Runoff Depth=7.69" 0.2 0.18 Tc=6.0 min Flow (cfs) 0.16 0.14 CN=98 0.12 0.1 0.08 0.06 0.04 0.02 0 567891011121314151617181920 Time (hours) Type III 24-hr 100 yr Rainfall=8.60" 335 Salem Street Page 26 Prepared by Sullivan Engineering Group, LLC HydroCAD® 7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems 6/2/2023 Subcatchment 2S_2P: Remaining Site Area Runoff=1.21 cfs @ 12.10 hrs, Volume=3,843 cf, Depth=1.96" 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 Rainfall=8.60" Area (sf)CNDescription 69098paved driveway 4098walkway 11,15039>75% Grass cover, Good, HSG A 11,6544950-75% Grass cover, Fair, HSG A 23,53446Weighted Average TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 6.0 Direct Entry, direct Subcatchment 2S_2P: Remaining Site Area Hydrograph Runoff 1.21 cfs Type III 24-hr 100 yr Rainfall=8.60" 1 Runoff Area=23,534 sf Runoff Volume=3,843 cf Runoff Depth=1.96" Tc=6.0 min Flow (cfs) CN=46 0 567891011121314151617181920 Time (hours) Type III 24-hr 100 yr Rainfall=8.60" 335 Salem Street Page 27 Prepared by Sullivan Engineering Group, LLC HydroCAD® 7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems 6/2/2023 Pond 1P: Infiltration Field Rawls Rate = 8.27 in/hr Inflow Area =1,826 sf, Inflow Depth = 7.69" for 100 yr event Inflow=0.35 cfs @ 12.09 hrs, Volume=1,170 cf Outflow=0.08 cfs @ 11.75 hrs, Volume=1,170 cf, Atten= 76%, Lag= 0.0 min Discarded=0.08 cfs @ 11.75 hrs, Volume=1,170 cf Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 95.78' @ 12.47 hrs Surf.Area= 430 sf Storage= 249 cf Plug-Flow detention time= 15.0 min calculated for 1,166 cf (100% of inflow) Center-of-Mass det. time= 14.8 min ( 747.6 - 732.8 ) #InvertAvail.StorageStorage Description 194.40'280 cf 10.49'W x 41.00'L x 1.67'H Prismatoid 718 cf Overall - 19 cf Embedded = 700 cf x 40.0% Voids 294.90'19 cf x 30 Inside #1 2.8"W x 12.0"H x 4.00'L Parabolic Arch 299 cfTotal Available Storage #RoutingInvertOutlet Devices 1Discarded0.00' 0.011480 fpm Exfiltration over entire Surface area Max=0.08 cfs @ 11.75 hrs HW=94.42' (Free Discharge) Discarded OutFlow (Exfiltration Controls 0.08 cfs) 1=Exfiltration Pond 1P: Infiltration Field Hydrograph Inflow Discarded 0.35 cfs 0.38 0.36 Inflow Area=1,826 sf 0.34 0.32 Peak Elev=95.78' 0.3 0.28 Storage=249 cf 0.26 0.24 0.22 0.2 0.18 Flow (cfs) 0.16 0.14 0.12 0.08 cfs 0.1 0.08 0.06 0.04 0.02 0 567891011121314151617181920 Time (hours) Type III 24-hr 100 yr Rainfall=8.60" 335 Salem Street Page 28 Prepared by Sullivan Engineering Group, LLC HydroCAD® 7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems 6/2/2023 Link 1L: Predevelopment (offsite) Inflow Area =25,360 sf, Inflow Depth = 2.28" for 100 yr event Inflow=1.56 cfs @ 12.10 hrs, Volume=4,816 cf Primary=1.56 cfs @ 12.10 hrs, Volume=4,816 cf, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Link 1L: Predevelopment (offsite) Hydrograph Inflow Primary 1.56 cfs 1.56 cfs Inflow Area=25,360 sf 1 Flow (cfs) 0 567891011121314151617181920 Time (hours) Type III 24-hr 100 yr Rainfall=8.60" 335 Salem Street Page 29 Prepared by Sullivan Engineering Group, LLC HydroCAD® 7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems 6/2/2023 Link 2L: Postdevelopment (offsite) Inflow Area =23,534 sf, Inflow Depth = 1.96" for 100 yr event Inflow=1.21 cfs @ 12.10 hrs, Volume=3,843 cf Primary=1.21 cfs @ 12.10 hrs, Volume=3,843 cf, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Link 2L: Postdevelopment (offsite) Hydrograph Inflow Primary 1.21 cfs 1.21 cfs Inflow Area=23,534 sf 1 Flow (cfs) 0 567891011121314151617181920 Time (hours)