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HomeMy WebLinkAbout335 Salem_Response Letter_07232024 - Correspondence - 335 Salem Street 7/23/2024 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 7/23/2024 HydroCAD® 7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems Type III 24-hr 1 inch Rainfall=1.00" 335 Salem Street Page 2 Prepared by Sullivan Engineering Group, LLC HydroCAD® 7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems 7/23/2024 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=0.00" Subcatchment 1S_E: Flow Length=226' Tc=7.8 min CN=39 Runoff=0.00 cfs 0 cf Runoff Area=1,336 sf Runoff Depth=0.75" Subcatchment 2S_1P: House Roof + Porch Roof Tc=6.0 min CN=98 Runoff=0.03 cfs 83 cf Runoff Area=24,024 sf Runoff Depth=0.00" Subcatchment 2S_2P: Remaining Site Area Flow Length=240' Tc=10.1 min CN=39 Runoff=0.00 cfs 0 cf Peak Elev=194.41' Storage=1 cf Inflow=0.03 cfs 83 cf Pond 1P: Infiltration Field Outflow=0.03 cfs 83 cf Inflow=0.00 cfs 0 cf Link 1L: Predevelopment (offsite) Primary=0.00 cfs 0 cf Inflow=0.00 cfs 0 cf Link 2L: Postdevelopment (offsite) Primary=0.00 cfs 0 cf Total Runoff Area = 50,720 sf Runoff Volume = 83 cf Average Runoff Depth = 0.02" Type III 24-hr 1 inch Rainfall=1.00" 335 Salem Street Page 3 Prepared by Sullivan Engineering Group, LLC HydroCAD® 7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems 7/23/2024 Subcatchment 1S_E: Runoff=0.00 cfs @ 5.00 hrs, Volume=0 cf, Depth=0.00" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 1 inch Rainfall=1.00" Area (sf)CNDescription 25,36039>75% Grass cover, Good, HSG A TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 5.7500.02000.1 Sheet Flow, Grass: Short n= 0.150 P2= 3.10" 2.11760.04001.4 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 7.8226Total Subcatchment 1S_E: Hydrograph 1 Runoff Type III 24-hr 1 inch Rainfall=1.00" Runoff Area=25,360 sf Runoff Volume=0 cf Runoff Depth=0.00" Flow (cfs) Flow Length=226' Tc=7.8 min CN=39 0.00 cfs 0 567891011121314151617181920 Time (hours) Type III 24-hr 1 inch Rainfall=1.00" 335 Salem Street Page 4 Prepared by Sullivan Engineering Group, LLC HydroCAD® 7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems 7/23/2024 Subcatchment 2S_1P: House Roof + Porch Roof Runoff=0.03 cfs @ 12.09 hrs, Volume=83 cf, Depth=0.75" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 1 inch Rainfall=1.00" Area (sf)CNDescription 1,28898Roof Area of House 4898Porch Roof 1,33698Weighted Average TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 6.0 Direct Entry, Direct Subcatchment 2S_1P: House Roof + Porch Roof Hydrograph Runoff 0.028 0.03 cfs 0.026 Type III 24-hr 1 inch 0.024 Rainfall=1.00" 0.022 0.02 Runoff Area=1,336 sf 0.018 Runoff Volume=83 cf 0.016 Runoff Depth=0.75" 0.014 Flow (cfs) 0.012 Tc=6.0 min 0.01 CN=98 0.008 0.006 0.004 0.002 0 567891011121314151617181920 Time (hours) Type III 24-hr 1 inch Rainfall=1.00" 335 Salem Street Page 5 Prepared by Sullivan Engineering Group, LLC HydroCAD® 7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems 7/23/2024 Subcatchment 2S_2P: Remaining Site Area Runoff=0.00 cfs @ 5.00 hrs, Volume=0 cf, Depth=0.00" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 1 inch Rainfall=1.00" Area (sf)CNDescription 31639walkway (pervious pavers) 12,60339>75% Grass cover, Good, HSG A 9,53839>75% Grass cover, Good, HSG A 7598retaining walls 4698bulkhead 1,44639(turfstone + pervious pavers) 24,02439Weighted Average TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 7.5500.01000.1 Sheet Flow, Grass: Short n= 0.150 P2= 3.10" 2.61900.03001.2 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 10.1240Total Subcatchment 2S_2P: Remaining Site Area Hydrograph 1 Runoff Type III 24-hr 1 inch Rainfall=1.00" Runoff Area=24,024 sf Runoff Volume=0 cf Runoff Depth=0.00" Flow (cfs) Flow Length=240' Tc=10.1 min CN=39 0.00 cfs 0 567891011121314151617181920 Time (hours) Type III 24-hr 1 inch Rainfall=1.00" 335 Salem Street Page 6 Prepared by Sullivan Engineering Group, LLC HydroCAD® 7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems 7/23/2024 Pond 1P: Infiltration Field Rawls Rate = 8.27 in/hr Inflow Area =1,336 sf, Inflow Depth = 0.75" for 1 inch event Inflow=0.03 cfs @ 12.09 hrs, Volume=83 cf Outflow=0.03 cfs @ 12.10 hrs, Volume=83 cf, Atten= 0%, Lag= 0.6 min Discarded=0.03 cfs @ 12.10 hrs, Volume=83 cf Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 194.41' @ 12.10 hrs Surf.Area= 294 sf Storage= 1 cf Plug-Flow detention time= 0.6 min calculated for 83 cf (100% of inflow) Center-of-Mass det. time= 0.5 min ( 759.1 - 758.5 ) #InvertAvail.StorageStorage Description 1194.40'191 cf 7.16'W x 41.00'L x 1.67'H Prismatoid 490 cf Overall - 12 cf Embedded = 478 cf x 40.0% Voids 2194.90'12 cf x 20 Inside #1 2.8"W x 12.0"H x 4.00'L Parabolic Arch 204 cfTotal Available Storage #RoutingInvertOutlet Devices 1Discarded0.00' 0.011480 fpm Exfiltration over entire Surface area Max=0.06 cfs @ 12.10 hrs HW=194.41' (Free Discharge) Discarded OutFlow (Exfiltration Controls 0.06 cfs) 1=Exfiltration Pond 1P: Infiltration Field Hydrograph Inflow Discarded 0.03 cfs 0.028 0.03 cfs Inflow Area=1,336 sf 0.026 Peak Elev=194.41' 0.024 0.022 Storage=1 cf 0.02 0.018 0.016 0.014 Flow (cfs) 0.012 0.01 0.008 0.006 0.004 0.002 0 567891011121314151617181920 Time (hours) Type III 24-hr 1 inch Rainfall=1.00" 335 Salem Street Page 7 Prepared by Sullivan Engineering Group, LLC HydroCAD® 7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems 7/23/2024 Link 1L: Predevelopment (offsite) Inflow Area =25,360 sf, Inflow Depth = 0.00" for 1 inch event Inflow=0.00 cfs @ 5.00 hrs, Volume=0 cf Primary=0.00 cfs @ 5.00 hrs, Volume=0 cf, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Link 1L: Predevelopment (offsite) Hydrograph Inflow 1 Primary Inflow Area=25,360 sf Flow (cfs) 0.00 cfs 0.00 cfs 0 567891011121314151617181920 Time (hours) Type III 24-hr 1 inch Rainfall=1.00" 335 Salem Street Page 8 Prepared by Sullivan Engineering Group, LLC HydroCAD® 7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems 7/23/2024 Link 2L: Postdevelopment (offsite) Inflow Area =24,024 sf, Inflow Depth = 0.00" for 1 inch event Inflow=0.00 cfs @ 5.00 hrs, Volume=0 cf Primary=0.00 cfs @ 5.00 hrs, Volume=0 cf, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Link 2L: Postdevelopment (offsite) Hydrograph Inflow 1 Primary Inflow Area=24,024 sf Flow (cfs) 0.00 cfs 0.00 cfs 0 567891011121314151617181920 Time (hours) Type III 24-hr 2 yr Rainfall=3.20" 335 Salem Street Page 9 Prepared by Sullivan Engineering Group, LLC HydroCAD® 7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems 7/23/2024 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=0.00" Subcatchment 1S_E: Flow Length=226' Tc=7.8 min CN=39 Runoff=0.00 cfs 0 cf Runoff Area=1,336 sf Runoff Depth=2.77" Subcatchment 2S_1P: House Roof + Porch Roof Tc=6.0 min CN=98 Runoff=0.09 cfs 309 cf Runoff Area=24,024 sf Runoff Depth=0.00" Subcatchment 2S_2P: Remaining Site Area Flow Length=240' Tc=10.1 min CN=39 Runoff=0.00 cfs 0 cf Peak Elev=194.54' Storage=17 cf Inflow=0.09 cfs 309 cf Pond 1P: Infiltration Field Outflow=0.06 cfs 309 cf Inflow=0.00 cfs 0 cf Link 1L: Predevelopment (offsite) Primary=0.00 cfs 0 cf Inflow=0.00 cfs 0 cf Link 2L: Postdevelopment (offsite) Primary=0.00 cfs 0 cf Total Runoff Area = 50,720 sf Runoff Volume = 309 cf Average Runoff Depth = 0.07" Type III 24-hr 2 yr Rainfall=3.20" 335 Salem Street Page 10 Prepared by Sullivan Engineering Group, LLC HydroCAD® 7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems 7/23/2024 Subcatchment 1S_E: Runoff=0.00 cfs @ 5.00 hrs, Volume=0 cf, Depth=0.00" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 2 yr Rainfall=3.20" Area (sf)CNDescription 25,36039>75% Grass cover, Good, HSG A TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 5.7500.02000.1 Sheet Flow, Grass: Short n= 0.150 P2= 3.10" 2.11760.04001.4 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 7.8226Total Subcatchment 1S_E: Hydrograph 1 Runoff Type III 24-hr 2 yr Rainfall=3.20" Runoff Area=25,360 sf Runoff Volume=0 cf Runoff Depth=0.00" Flow (cfs) Flow Length=226' Tc=7.8 min CN=39 0.00 cfs 0 567891011121314151617181920 Time (hours) Type III 24-hr 2 yr Rainfall=3.20" 335 Salem Street Page 11 Prepared by Sullivan Engineering Group, LLC HydroCAD® 7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems 7/23/2024 Subcatchment 2S_1P: House Roof + Porch Roof Runoff=0.09 cfs @ 12.09 hrs, Volume=309 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 1,28898Roof Area of House 4898Porch Roof 1,33698Weighted Average TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 6.0 Direct Entry, Direct Subcatchment 2S_1P: House Roof + Porch Roof Hydrograph Runoff 0.1 0.09 cfs 0.095 0.09 Type III 24-hr 2 yr 0.085 0.08 Rainfall=3.20" 0.075 Runoff Area=1,336 sf 0.07 0.065 Runoff Volume=309 cf 0.06 0.055 Runoff Depth=2.77" 0.05 Flow (cfs) 0.045 Tc=6.0 min 0.04 0.035 CN=98 0.03 0.025 0.02 0.015 0.01 0.005 0 567891011121314151617181920 Time (hours) Type III 24-hr 2 yr Rainfall=3.20" 335 Salem Street Page 12 Prepared by Sullivan Engineering Group, LLC HydroCAD® 7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems 7/23/2024 Subcatchment 2S_2P: Remaining Site Area Runoff=0.00 cfs @ 5.00 hrs, Volume=0 cf, Depth=0.00" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 2 yr Rainfall=3.20" Area (sf)CNDescription 31639walkway (pervious pavers) 12,60339>75% Grass cover, Good, HSG A 9,53839>75% Grass cover, Good, HSG A 7598retaining walls 4698bulkhead 1,44639(turfstone + pervious pavers) 24,02439Weighted Average TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 7.5500.01000.1 Sheet Flow, Grass: Short n= 0.150 P2= 3.10" 2.61900.03001.2 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 10.1240Total Subcatchment 2S_2P: Remaining Site Area Hydrograph 1 Runoff Type III 24-hr 2 yr Rainfall=3.20" Runoff Area=24,024 sf Runoff Volume=0 cf Runoff Depth=0.00" Flow (cfs) Flow Length=240' Tc=10.1 min CN=39 0.00 cfs 0 567891011121314151617181920 Time (hours) Type III 24-hr 2 yr Rainfall=3.20" 335 Salem Street Page 13 Prepared by Sullivan Engineering Group, LLC HydroCAD® 7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems 7/23/2024 Pond 1P: Infiltration Field Rawls Rate = 8.27 in/hr Inflow Area =1,336 sf, Inflow Depth = 2.77" for 2 yr event Inflow=0.09 cfs @ 12.09 hrs, Volume=309 cf Outflow=0.06 cfs @ 12.00 hrs, Volume=309 cf, Atten= 40%, Lag= 0.0 min Discarded=0.06 cfs @ 12.00 hrs, Volume=309 cf Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 194.54' @ 12.20 hrs Surf.Area= 294 sf Storage= 17 cf Plug-Flow detention time= 1.4 min calculated for 308 cf (100% of inflow) Center-of-Mass det. time= 1.2 min ( 739.8 - 738.6 ) #InvertAvail.StorageStorage Description 1194.40'191 cf 7.16'W x 41.00'L x 1.67'H Prismatoid 490 cf Overall - 12 cf Embedded = 478 cf x 40.0% Voids 2194.90'12 cf x 20 Inside #1 2.8"W x 12.0"H x 4.00'L Parabolic Arch 204 cfTotal Available Storage #RoutingInvertOutlet Devices 1Discarded0.00' 0.011480 fpm Exfiltration over entire Surface area Max=0.06 cfs @ 12.00 hrs HW=194.42' (Free Discharge) Discarded OutFlow (Exfiltration Controls 0.06 cfs) 1=Exfiltration Pond 1P: Infiltration Field Hydrograph Inflow Discarded 0.09 cfs 0.1 0.095 Inflow Area=1,336 sf 0.09 0.085 Peak Elev=194.54' 0.08 0.075 Storage=17 cf 0.07 0.065 0.06 cfs 0.06 0.055 0.05 0.045 Flow (cfs) 0.04 0.035 0.03 0.025 0.02 0.015 0.01 0.005 0 567891011121314151617181920 Time (hours) Type III 24-hr 2 yr Rainfall=3.20" 335 Salem Street Page 14 Prepared by Sullivan Engineering Group, LLC HydroCAD® 7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems 7/23/2024 Link 1L: Predevelopment (offsite) Inflow Area =25,360 sf, Inflow Depth = 0.00" for 2 yr event Inflow=0.00 cfs @ 5.00 hrs, Volume=0 cf Primary=0.00 cfs @ 5.00 hrs, Volume=0 cf, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Link 1L: Predevelopment (offsite) Hydrograph Inflow 1 Primary Inflow Area=25,360 sf Flow (cfs) 0.00 cfs 0.00 cfs 0 567891011121314151617181920 Time (hours) Type III 24-hr 2 yr Rainfall=3.20" 335 Salem Street Page 15 Prepared by Sullivan Engineering Group, LLC HydroCAD® 7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems 7/23/2024 Link 2L: Postdevelopment (offsite) Inflow Area =24,024 sf, Inflow Depth = 0.00" for 2 yr event Inflow=0.00 cfs @ 5.00 hrs, Volume=0 cf Primary=0.00 cfs @ 5.00 hrs, Volume=0 cf, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Link 2L: Postdevelopment (offsite) Hydrograph Inflow 1 Primary Inflow Area=24,024 sf Flow (cfs) 0.00 cfs 0.00 cfs 0 567891011121314151617181920 Time (hours) Type III 24-hr 10 yr Rainfall=4.80" 335 Salem Street Page 16 Prepared by Sullivan Engineering Group, LLC HydroCAD® 7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems 7/23/2024 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=0.12" Subcatchment 1S_E: Flow Length=226' Tc=7.8 min CN=39 Runoff=0.01 cfs 263 cf Runoff Area=1,336 sf Runoff Depth=4.24" Subcatchment 2S_1P: House Roof + Porch Roof Tc=6.0 min CN=98 Runoff=0.14 cfs 472 cf Runoff Area=24,024 sf Runoff Depth=0.12" Subcatchment 2S_2P: Remaining Site Area Flow Length=240' Tc=10.1 min CN=39 Runoff=0.01 cfs 249 cf Peak Elev=194.86' Storage=54 cf Inflow=0.14 cfs 472 cf Pond 1P: Infiltration Field Outflow=0.06 cfs 472 cf Inflow=0.01 cfs 263 cf Link 1L: Predevelopment (offsite) Primary=0.01 cfs 263 cf Inflow=0.01 cfs 249 cf Link 2L: Postdevelopment (offsite) Primary=0.01 cfs 249 cf Total Runoff Area = 50,720 sf Runoff Volume = 983 cf Average Runoff Depth = 0.23" Type III 24-hr 10 yr Rainfall=4.80" 335 Salem Street Page 17 Prepared by Sullivan Engineering Group, LLC HydroCAD® 7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems 7/23/2024 Subcatchment 1S_E: Runoff=0.01 cfs @ 13.70 hrs, Volume=263 cf, Depth=0.12" 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 25,36039>75% Grass cover, Good, HSG A TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 5.7500.02000.1 Sheet Flow, Grass: Short n= 0.150 P2= 3.10" 2.11760.04001.4 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 7.8226Total Subcatchment 1S_E: Hydrograph Runoff 0.014 0.01 cfs 0.013 Type III 24-hr 10 yr 0.012 Rainfall=4.80" 0.011 0.01 Runoff Area=25,360 sf 0.009 Runoff Volume=263 cf 0.008 Runoff Depth=0.12" 0.007 Flow (cfs) 0.006 Flow Length=226' 0.005 Tc=7.8 min 0.004 CN=39 0.003 0.002 0.001 0 567891011121314151617181920 Time (hours) Type III 24-hr 10 yr Rainfall=4.80" 335 Salem Street Page 18 Prepared by Sullivan Engineering Group, LLC HydroCAD® 7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems 7/23/2024 Subcatchment 2S_1P: House Roof + Porch Roof Runoff=0.14 cfs @ 12.09 hrs, Volume=472 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 1,28898Roof Area of House 4898Porch Roof 1,33698Weighted Average TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 6.0 Direct Entry, Direct Subcatchment 2S_1P: House Roof + Porch Roof Hydrograph Runoff 0.15 0.14 cfs 0.14 Type III 24-hr 10 yr 0.13 Rainfall=4.80" 0.12 0.11 Runoff Area=1,336 sf 0.1 Runoff Volume=472 cf 0.09 0.08 Runoff Depth=4.24" 0.07 Flow (cfs) Tc=6.0 min 0.06 0.05 CN=98 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 19 Prepared by Sullivan Engineering Group, LLC HydroCAD® 7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems 7/23/2024 Subcatchment 2S_2P: Remaining Site Area Runoff=0.01 cfs @ 13.74 hrs, Volume=249 cf, Depth=0.12" 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 31639walkway (pervious pavers) 12,60339>75% Grass cover, Good, HSG A 9,53839>75% Grass cover, Good, HSG A 7598retaining walls 4698bulkhead 1,44639(turfstone + pervious pavers) 24,02439Weighted Average TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 7.5500.01000.1 Sheet Flow, Grass: Short n= 0.150 P2= 3.10" 2.61900.03001.2 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 10.1240Total Subcatchment 2S_2P: Remaining Site Area Hydrograph Runoff 0.01 cfs 0.013 Type III 24-hr 10 yr 0.012 0.011 Rainfall=4.80" 0.01 Runoff Area=24,024 sf 0.009 Runoff Volume=249 cf 0.008 0.007 Runoff Depth=0.12" Flow (cfs) 0.006 Flow Length=240' 0.005 Tc=10.1 min 0.004 0.003 CN=39 0.002 0.001 0 567891011121314151617181920 Time (hours) Type III 24-hr 10 yr Rainfall=4.80" 335 Salem Street Page 20 Prepared by Sullivan Engineering Group, LLC HydroCAD® 7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems 7/23/2024 Pond 1P: Infiltration Field Rawls Rate = 8.27 in/hr Inflow Area =1,336 sf, Inflow Depth = 4.24" for 10 yr event Inflow=0.14 cfs @ 12.09 hrs, Volume=472 cf Outflow=0.06 cfs @ 11.95 hrs, Volume=472 cf, Atten= 60%, Lag= 0.0 min Discarded=0.06 cfs @ 11.95 hrs, Volume=472 cf Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 194.86' @ 12.31 hrs Surf.Area= 294 sf Storage= 54 cf Plug-Flow detention time= 4.2 min calculated for 472 cf (100% of inflow) Center-of-Mass det. time= 4.1 min ( 739.4 - 735.4 ) #InvertAvail.StorageStorage Description 1194.40'191 cf 7.16'W x 41.00'L x 1.67'H Prismatoid 490 cf Overall - 12 cf Embedded = 478 cf x 40.0% Voids 2194.90'12 cf x 20 Inside #1 2.8"W x 12.0"H x 4.00'L Parabolic Arch 204 cfTotal Available Storage #RoutingInvertOutlet Devices 1Discarded0.00' 0.011480 fpm Exfiltration over entire Surface area Max=0.06 cfs @ 11.95 hrs HW=194.43' (Free Discharge) Discarded OutFlow (Exfiltration Controls 0.06 cfs) 1=Exfiltration Pond 1P: Infiltration Field Hydrograph Inflow Discarded 0.14 cfs 0.15 Inflow Area=1,336 sf 0.14 0.13 Peak Elev=194.86' 0.12 Storage=54 cf 0.11 0.1 0.09 0.08 0.07 Flow (cfs) 0.06 cfs 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 21 Prepared by Sullivan Engineering Group, LLC HydroCAD® 7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems 7/23/2024 Link 1L: Predevelopment (offsite) Inflow Area =25,360 sf, Inflow Depth = 0.12" for 10 yr event Inflow=0.01 cfs @ 13.70 hrs, Volume=263 cf Primary=0.01 cfs @ 13.70 hrs, Volume=263 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 0.014 0.01 cfs Inflow Area=25,360 sf 0.013 0.012 0.011 0.01 0.009 0.008 0.007 Flow (cfs) 0.006 0.005 0.004 0.003 0.002 0.001 0 567891011121314151617181920 Time (hours) Type III 24-hr 10 yr Rainfall=4.80" 335 Salem Street Page 22 Prepared by Sullivan Engineering Group, LLC HydroCAD® 7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems 7/23/2024 Link 2L: Postdevelopment (offsite) Inflow Area =24,024 sf, Inflow Depth = 0.12" for 10 yr event Inflow=0.01 cfs @ 13.74 hrs, Volume=249 cf Primary=0.01 cfs @ 13.74 hrs, Volume=249 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 0.01 cfs 0.01 cfs 0.013 Inflow Area=24,024 sf 0.012 0.011 0.01 0.009 0.008 0.007 0.006 Flow (cfs) 0.005 0.004 0.003 0.002 0.001 0 567891011121314151617181920 Time (hours) Type III 24-hr 25 yr Rainfall=6.00" 335 Salem Street Page 23 Prepared by Sullivan Engineering Group, LLC HydroCAD® 7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems 7/23/2024 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=0.37" Subcatchment 1S_E: Flow Length=226' Tc=7.8 min CN=39 Runoff=0.10 cfs 787 cf Runoff Area=1,336 sf Runoff Depth=5.33" Subcatchment 2S_1P: House Roof + Porch Roof Tc=6.0 min CN=98 Runoff=0.18 cfs 593 cf Runoff Area=24,024 sf Runoff Depth=0.37" Subcatchment 2S_2P: Remaining Site Area Flow Length=240' Tc=10.1 min CN=39 Runoff=0.09 cfs 744 cf Peak Elev=195.17' Storage=93 cf Inflow=0.18 cfs 593 cf Pond 1P: Infiltration Field Outflow=0.06 cfs 593 cf Inflow=0.10 cfs 787 cf Link 1L: Predevelopment (offsite) Primary=0.10 cfs 787 cf Inflow=0.09 cfs 744 cf Link 2L: Postdevelopment (offsite) Primary=0.09 cfs 744 cf Total Runoff Area = 50,720 sf Runoff Volume = 2,124 cf Average Runoff Depth = 0.50" Type III 24-hr 25 yr Rainfall=6.00" 335 Salem Street Page 24 Prepared by Sullivan Engineering Group, LLC HydroCAD® 7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems 7/23/2024 Subcatchment 1S_E: Runoff=0.10 cfs @ 12.37 hrs, Volume=787 cf, Depth=0.37" 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 25,36039>75% Grass cover, Good, HSG A TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 5.7500.02000.1 Sheet Flow, Grass: Short n= 0.150 P2= 3.10" 2.11760.04001.4 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 7.8226Total Subcatchment 1S_E: Hydrograph Runoff 0.11 0.10 cfs 0.105 0.1 Type III 24-hr 25 yr 0.095 0.09 Rainfall=6.00" 0.085 0.08 Runoff Area=25,360 sf 0.075 0.07 Runoff Volume=787 cf 0.065 0.06 Runoff Depth=0.37" 0.055 0.05 Flow (cfs) 0.045 Flow Length=226' 0.04 0.035 Tc=7.8 min 0.03 0.025 CN=39 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 25 Prepared by Sullivan Engineering Group, LLC HydroCAD® 7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems 7/23/2024 Subcatchment 2S_1P: House Roof + Porch Roof Runoff=0.18 cfs @ 12.09 hrs, Volume=593 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 1,28898Roof Area of House 4898Porch Roof 1,33698Weighted Average TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 6.0 Direct Entry, Direct Subcatchment 2S_1P: House Roof + Porch Roof Hydrograph Runoff 0.19 0.18 cfs 0.18 0.17 Type III 24-hr 25 yr 0.16 Rainfall=6.00" 0.15 0.14 Runoff Area=1,336 sf 0.13 0.12 Runoff Volume=593 cf 0.11 0.1 Runoff Depth=5.33" 0.09 Flow (cfs) 0.08 Tc=6.0 min 0.07 0.06 CN=98 0.05 0.04 0.03 0.02 0.01 0 567891011121314151617181920 Time (hours) Type III 24-hr 25 yr Rainfall=6.00" 335 Salem Street Page 26 Prepared by Sullivan Engineering Group, LLC HydroCAD® 7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems 7/23/2024 Subcatchment 2S_2P: Remaining Site Area Runoff=0.09 cfs @ 12.41 hrs, Volume=744 cf, Depth=0.37" 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 31639walkway (pervious pavers) 12,60339>75% Grass cover, Good, HSG A 9,53839>75% Grass cover, Good, HSG A 7598retaining walls 4698bulkhead 1,44639(turfstone + pervious pavers) 24,02439Weighted Average TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 7.5500.01000.1 Sheet Flow, Grass: Short n= 0.150 P2= 3.10" 2.61900.03001.2 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 10.1240Total Subcatchment 2S_2P: Remaining Site Area Hydrograph 0.105 Runoff 0.1 0.09 cfs 0.095 Type III 24-hr 25 yr 0.09 0.085 Rainfall=6.00" 0.08 0.075 Runoff Area=24,024 sf 0.07 0.065 Runoff Volume=744 cf 0.06 0.055 Runoff Depth=0.37" 0.05 Flow (cfs) 0.045 Flow Length=240' 0.04 0.035 Tc=10.1 min 0.03 0.025 CN=39 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 27 Prepared by Sullivan Engineering Group, LLC HydroCAD® 7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems 7/23/2024 Pond 1P: Infiltration Field Rawls Rate = 8.27 in/hr Inflow Area =1,336 sf, Inflow Depth = 5.33" for 25 yr event Inflow=0.18 cfs @ 12.09 hrs, Volume=593 cf Outflow=0.06 cfs @ 11.85 hrs, Volume=593 cf, Atten= 68%, Lag= 0.0 min Discarded=0.06 cfs @ 11.85 hrs, Volume=593 cf Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 195.17' @ 12.38 hrs Surf.Area= 294 sf Storage= 93 cf Plug-Flow detention time= 7.5 min calculated for 591 cf (100% of inflow) Center-of-Mass det. time= 7.3 min ( 741.5 - 734.2 ) #InvertAvail.StorageStorage Description 1194.40'191 cf 7.16'W x 41.00'L x 1.67'H Prismatoid 490 cf Overall - 12 cf Embedded = 478 cf x 40.0% Voids 2194.90'12 cf x 20 Inside #1 2.8"W x 12.0"H x 4.00'L Parabolic Arch 204 cfTotal Available Storage #RoutingInvertOutlet Devices 1Discarded0.00' 0.011480 fpm Exfiltration over entire Surface area Max=0.06 cfs @ 11.85 hrs HW=194.42' (Free Discharge) Discarded OutFlow (Exfiltration Controls 0.06 cfs) 1=Exfiltration Pond 1P: Infiltration Field Hydrograph Inflow Discarded 0.18 cfs 0.19 0.18 Inflow Area=1,336 sf 0.17 0.16 Peak Elev=195.17' 0.15 0.14 Storage=93 cf 0.13 0.12 0.11 0.1 0.09 Flow (cfs) 0.08 0.07 0.06 cfs 0.06 0.05 0.04 0.03 0.02 0.01 0 567891011121314151617181920 Time (hours) Type III 24-hr 25 yr Rainfall=6.00" 335 Salem Street Page 28 Prepared by Sullivan Engineering Group, LLC HydroCAD® 7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems 7/23/2024 Link 1L: Predevelopment (offsite) Inflow Area =25,360 sf, Inflow Depth = 0.37" for 25 yr event Inflow=0.10 cfs @ 12.37 hrs, Volume=787 cf Primary=0.10 cfs @ 12.37 hrs, Volume=787 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 0.10 cfs 0.11 0.10 cfs 0.105 Inflow Area=25,360 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 29 Prepared by Sullivan Engineering Group, LLC HydroCAD® 7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems 7/23/2024 Link 2L: Postdevelopment (offsite) Inflow Area =24,024 sf, Inflow Depth = 0.37" for 25 yr event Inflow=0.09 cfs @ 12.41 hrs, Volume=744 cf Primary=0.09 cfs @ 12.41 hrs, Volume=744 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 0.105 Primary 0.09 cfs 0.1 0.09 cfs 0.095 Inflow Area=24,024 sf 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 100 yr Rainfall=8.60" 335 Salem Street Page 30 Prepared by Sullivan Engineering Group, LLC HydroCAD® 7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems 7/23/2024 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=1.25" Subcatchment 1S_E: Flow Length=226' Tc=7.8 min CN=39 Runoff=0.64 cfs 2,642 cf Runoff Area=1,336 sf Runoff Depth=7.69" Subcatchment 2S_1P: House Roof + Porch Roof Tc=6.0 min CN=98 Runoff=0.25 cfs 856 cf Runoff Area=24,024 sf Runoff Depth=1.25" Subcatchment 2S_2P: Remaining Site Area Flow Length=240' Tc=10.1 min CN=39 Runoff=0.56 cfs 2,500 cf Peak Elev=195.98' Storage=193 cf Inflow=0.25 cfs 856 cf Pond 1P: Infiltration Field Outflow=0.06 cfs 856 cf Inflow=0.64 cfs 2,642 cf Link 1L: Predevelopment (offsite) Primary=0.64 cfs 2,642 cf Inflow=0.56 cfs 2,500 cf Link 2L: Postdevelopment (offsite) Primary=0.56 cfs 2,500 cf Total Runoff Area = 50,720 sf Runoff Volume = 5,998 cf Average Runoff Depth = 1.42" Type III 24-hr 100 yr Rainfall=8.60" 335 Salem Street Page 31 Prepared by Sullivan Engineering Group, LLC HydroCAD® 7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems 7/23/2024 Subcatchment 1S_E: Runoff=0.64 cfs @ 12.15 hrs, Volume=2,642 cf, Depth=1.25" 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 25,36039>75% Grass cover, Good, HSG A TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 5.7500.02000.1 Sheet Flow, Grass: Short n= 0.150 P2= 3.10" 2.11760.04001.4 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 7.8226Total Subcatchment 1S_E: Hydrograph Runoff 0.7 0.64 cfs 0.65 Type III 24-hr 100 yr 0.6 Rainfall=8.60" 0.55 0.5 Runoff Area=25,360 sf 0.45 Runoff Volume=2,642 cf 0.4 Runoff Depth=1.25" 0.35 Flow Length=226' Flow (cfs) 0.3 Tc=7.8 min 0.25 0.2 CN=39 0.15 0.1 0.05 0 567891011121314151617181920 Time (hours) Type III 24-hr 100 yr Rainfall=8.60" 335 Salem Street Page 32 Prepared by Sullivan Engineering Group, LLC HydroCAD® 7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems 7/23/2024 Subcatchment 2S_1P: House Roof + Porch Roof Runoff=0.25 cfs @ 12.09 hrs, Volume=856 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 1,28898Roof Area of House 4898Porch Roof 1,33698Weighted Average TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 6.0 Direct Entry, Direct Subcatchment 2S_1P: House Roof + Porch Roof Hydrograph 0.28 Runoff 0.25 cfs 0.26 Type III 24-hr 100 yr 0.24 0.22 Rainfall=8.60" 0.2 Runoff Area=1,336 sf 0.18 Runoff Volume=856 cf 0.16 0.14 Runoff Depth=7.69" Flow (cfs) 0.12 Tc=6.0 min 0.1 CN=98 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 33 Prepared by Sullivan Engineering Group, LLC HydroCAD® 7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems 7/23/2024 Subcatchment 2S_2P: Remaining Site Area Runoff=0.56 cfs @ 12.18 hrs, Volume=2,500 cf, Depth=1.25" 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 31639walkway (pervious pavers) 12,60339>75% Grass cover, Good, HSG A 9,53839>75% Grass cover, Good, HSG A 7598retaining walls 4698bulkhead 1,44639(turfstone + pervious pavers) 24,02439Weighted Average TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 7.5500.01000.1 Sheet Flow, Grass: Short n= 0.150 P2= 3.10" 2.61900.03001.2 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 10.1240Total Subcatchment 2S_2P: Remaining Site Area Hydrograph Runoff 0.6 0.56 cfs 0.55 Type III 24-hr 100 yr 0.5 Rainfall=8.60" 0.45 Runoff Area=24,024 sf 0.4 Runoff Volume=2,500 cf 0.35 Runoff Depth=1.25" 0.3 Flow Length=240' Flow (cfs) 0.25 Tc=10.1 min 0.2 CN=39 0.15 0.1 0.05 0 567891011121314151617181920 Time (hours) Type III 24-hr 100 yr Rainfall=8.60" 335 Salem Street Page 34 Prepared by Sullivan Engineering Group, LLC HydroCAD® 7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems 7/23/2024 Pond 1P: Infiltration Field Rawls Rate = 8.27 in/hr Inflow Area =1,336 sf, Inflow Depth = 7.69" for 100 yr event Inflow=0.25 cfs @ 12.09 hrs, Volume=856 cf Outflow=0.06 cfs @ 11.75 hrs, Volume=856 cf, Atten= 78%, Lag= 0.0 min Discarded=0.06 cfs @ 11.75 hrs, Volume=856 cf Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 195.98' @ 12.49 hrs Surf.Area= 294 sf Storage= 193 cf Plug-Flow detention time= 17.5 min calculated for 853 cf (100% of inflow) Center-of-Mass det. time= 17.2 min ( 750.1 - 732.8 ) #InvertAvail.StorageStorage Description 1194.40'191 cf 7.16'W x 41.00'L x 1.67'H Prismatoid 490 cf Overall - 12 cf Embedded = 478 cf x 40.0% Voids 2194.90'12 cf x 20 Inside #1 2.8"W x 12.0"H x 4.00'L Parabolic Arch 204 cfTotal Available Storage #RoutingInvertOutlet Devices 1Discarded0.00' 0.011480 fpm Exfiltration over entire Surface area Max=0.06 cfs @ 11.75 hrs HW=194.43' (Free Discharge) Discarded OutFlow (Exfiltration Controls 0.06 cfs) 1=Exfiltration Pond 1P: Infiltration Field Hydrograph Inflow 0.28 Discarded 0.25 cfs 0.26 Inflow Area=1,336 sf 0.24 Peak Elev=195.98' 0.22 0.2 Storage=193 cf 0.18 0.16 0.14 Flow (cfs) 0.12 0.1 0.08 0.06 cfs 0.06 0.04 0.02 0 567891011121314151617181920 Time (hours) Type III 24-hr 100 yr Rainfall=8.60" 335 Salem Street Page 35 Prepared by Sullivan Engineering Group, LLC HydroCAD® 7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems 7/23/2024 Link 1L: Predevelopment (offsite) Inflow Area =25,360 sf, Inflow Depth = 1.25" for 100 yr event Inflow=0.64 cfs @ 12.15 hrs, Volume=2,642 cf Primary=0.64 cfs @ 12.15 hrs, Volume=2,642 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 0.64 cfs 0.7 0.64 cfs 0.65 Inflow Area=25,360 sf 0.6 0.55 0.5 0.45 0.4 0.35 Flow (cfs) 0.3 0.25 0.2 0.15 0.1 0.05 0 567891011121314151617181920 Time (hours) Type III 24-hr 100 yr Rainfall=8.60" 335 Salem Street Page 36 Prepared by Sullivan Engineering Group, LLC HydroCAD® 7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems 7/23/2024 Link 2L: Postdevelopment (offsite) Inflow Area =24,024 sf, Inflow Depth = 1.25" for 100 yr event Inflow=0.56 cfs @ 12.18 hrs, Volume=2,500 cf Primary=0.56 cfs @ 12.18 hrs, Volume=2,500 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 0.56 cfs 0.6 0.56 cfs Inflow Area=24,024 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) tztufn/ jogjmusbujpo uif Bobmztjt pg dbqbdjuz tupsbhf uif Npvoejoh fodspbdi opu xjmm gu 1/34 pg Hspvoexbufs npvoe b Uifsfgpsf )tbnfhvjefmjoftgpsjogjmusbups* 335 Salem Street, North Andover Inspection and Maintenance Report Form To be completed per the Operation and Maintenance schedule Inspector: ______________________ Date:__________________ Inspection Checklist Item: Driveway & Walkway Pavers Accumulated sand, sediment, leaves Yes or No (circle one) Sweeping took place Yes or No (circle one) Roof drains inlets and downspouts Any signs of sediment or debris at outlets Yes or No (circle one) Condition of drain inlets/downspouts Good or Poor (circle one) Any piping need replacement Yes or No (circle one) Remove leaves from gutters Yes or No (circle one) Infiltration Chambers Any signs of water breakout Yes or No (circle one) Any water in chambers Yes or No (circle one) If water in chamber, is it empy after 72 hrs Yes or No (circle one) Vegetation Does site vegetation, including grass look health Yes or No (circle one) Inspection Port Did inspection port open Yes or No (circle one) Is Inspection port in good condition Yes or No (circle one) Additional Notes or Corrective measures taken: _____________________________________ _____________________________________________________________________________ ________________________________________________________________________________________ P.O. Box 2004 Woburn, MA 01888 (781) 854-8644 e-mail: jacksull53@comcast.net OPERATIONS AND MAINTENANCE GUIDELINES Published by CULTEC P.O. Box 280 878 Federal Road Copyright Notice Disclaimers: Protected by one or more of the following patents owned by Cultec: Contact Information: Doc ID: CLT057 11-23 November 2023 2 For more information, contact CULTEC at (203) 775-4416 or visit www.cultec.com. © CULTEC CLT057 11-23 CULTEC STORMWATER CHAMBERS Introduction - Operation and Maintenance Requirements I.Operation II.Inspection and Maintenance Options A. B. 1. Manhole Access 3 For more information, contact CULTEC at (203) 775-4416 or visit www.cultec.com. © CULTEC CLT057 11-23 OPERATIONS AND MAINTENANCE GUIDELINES 2. StormFilter Access C. III.Maintenance Guidelines A. B. C. D. IV.Suggested Maintenance Schedules A.Minor Maintenance FrequencyAction B.Major Maintenance 4 For more information, contact CULTEC at (203) 775-4416 or visit www.cultec.com. © CULTEC CLT057 11-23 CULTEC STORMWATER CHAMBERS FrequencyAction • •- -• • -• • • - ed. -• •- - • •- • • • • • 5 For more information, contact CULTEC at (203) 775-4416 or visit www.cultec.com. © CULTEC CLT057 11-23 OPERATIONS AND MAINTENANCE GUIDELINES WQMP Operation & Maintenance (O&M) Plan Prepared for: Prepared on: 6 For more information, contact CULTEC at (203) 775-4416 or visit www.cultec.com. © CULTEC CLT057 11-23 CULTEC STORMWATER CHAMBERS - 8.1.1Project Information 8.1.2Responsible Party 8.1.3Record Keeping - - 8.1.4Electronic Data Submittal 7 For more information, contact CULTEC at (203) 775-4416 or visit www.cultec.com. © CULTEC CLT057 11-23 OPERATIONS AND MAINTENANCE GUIDELINES Appendix___ BMP SITE PLAN 8 For more information, contact CULTEC at (203) 775-4416 or visit www.cultec.com. © CULTEC CLT057 11-23 CULTEC STORMWATER CHAMBERS BMP OPERATION & MAINTENANCE LOG _______________________________________ BMP NameBrief Description of Implementation, (As Shown in O&M Plan)Maintenance, and Inspection Activity Performed 9 For more information, contact CULTEC at (203) 775-4416 or visit www.cultec.com. © CULTEC CLT057 11-23 OPERATIONS AND MAINTENANCE GUIDELINES Minor Maintenance FrequencyAction Spring and Fall One year after commissioning and every third year following 10 For more information, contact CULTEC at (203) 775-4416 or visit www.cultec.com. © CULTEC CLT057 11-23 CULTEC STORMWATER CHAMBERS Major Maintenance FrequencyAction Every 3 years Spring and Fall 2 years after commissioning - 11 For more information, contact CULTEC at (203) 775-4416 or visit www.cultec.com. © CULTEC CLT057 11-23 OPERATIONS AND MAINTENANCE GUIDELINES Major Maintenance FrequencyAction 9 years after commissioning every 9 years following - 45 years after commissioning - 12 For more information, contact CULTEC at (203) 775-4416 or visit www.cultec.com. © CULTEC CLT057 11-23 CULTEC STORMWATER CHAMBERS Major Maintenance FrequencyAction st Monthly in 1year Spring and Fall Yearly 13 For more information, contact CULTEC at (203) 775-4416 or visit www.cultec.com. © CULTEC CLT057 11-23 CULTEC 878 Federal Road • P.O. Box 280 • • • RETENTION • DETENTION • • ©CULTEC CLT057 11-23