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HomeMy WebLinkAboutStormwater-Calcs408 UPLAND ROAD OFFICE BUILDING 11/3/2021 STORMWATER MANAGEMENT DATA AND CALCULATION SITE DATA* SOIL COVER IMPERVIOUS PERVIOUS TOTAL EXISTING 14,310 S.F.12,440 S.F.26,750 S.F. PROPOSED 15,840 S.F.10,910 S.F.26,750 S.F. DIFFERENCE 1,530 S.F.1,530 S.F.0 S.F. * AREAS ARE TO EXISTING EDGE OF PAVEMENT ON UPTOWN ROAD. WATER QUALITY TREATMENT ** TREATMENT REQUIRED=25% X EXISTING + 100% x INCREASE 25% x 14,310 S.F. + 100% X 1,530 S.F. 5,108 S.F. TREATED PROVIDED=8,260 S.F.RAIN GARDEN @ 100% 2,880 S.F.ALTERNATIVE PRACTICE @ 33% 11,140 S.F.TOTAL ** PER CHAPTER 9 OF THE NYS DESIGN STANDARDS EXPRESSED AS AREA OF IMPERVIOUS SOIL COVER. PEAK RATES OF RUNOFF*** STORM EVENT EXISTING PROPOSED DIFFERENCE 1-YEAR 0.97 CFS 0.68 CFS -0.29 CFS 2-YEAR 1.25 CFS 0.86 CFS -0.39 CFS 10-YEAR 2.20 CFS 2.11 CFS -0.09 CFS 100-YEAR 4.46 CFS 4.35 CFS -0.11 CFS *** INCLUDES ATTENUATION OF FLOW PROVIDED BY 690 S.F. BIORETENTION FILTER (RAIN GARDEN). SEE ATTACHED HYDROCAD CALCULATIONS. 408 E Upland Road Printed 10/15/2021Prepared by {enter your company name here} Page 1HydroCAD® 10.10-5a s/n 05659 © 2020 HydroCAD Software Solutions LLC Rainfall Events Listing Event# Event Name Storm Type Curve Mode Duration (hours) B/B Depth (inches) AMC 1 1-YR Type II 24-hr Default 24.00 1 2.01 2 2 2-YR Type II 24-hr Default 24.00 1 2.34 2 3 10-YR Type II 24-hr Default 24.00 1 3.43 2 4 100-YR Type II 24-hr Default 24.00 1 5.93 2 Type II 24-hr 1-YR Rainfall=2.01"408 E Upland Road Printed 10/15/2021Prepared by {enter your company name here} Page 2HydroCAD® 10.10-5a s/n 05659 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: EXISTING Runoff = 0.97 cfs @ 11.97 hrs, Volume= 0.043 af, Depth> 0.84" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 1-YR Rainfall=2.01" Area (sf) CN Description * 14,310 98 IMPERVIOUS * 12,440 74 LAWN, LANDSCAPE 26,750 87 Weighted Average 12,440 46.50% Pervious Area 14,310 53.50% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, MINIMUM Summary for Subcatchment 2S: PROPOSED TO PRACTICE Runoff = 0.37 cfs @ 11.97 hrs, Volume= 0.016 af, Depth> 0.84" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 1-YR Rainfall=2.01" Area (sf) CN Description * 5,615 98 IMPERVIOUS * 4,580 74 LAW, LANDSCAPE 10,195 87 Weighted Average 4,580 44.92% Pervious Area 5,615 55.08% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, MIN Summary for Subcatchment 3S: PROPOSED NOT TO PRACTICE Runoff = 0.68 cfs @ 11.97 hrs, Volume= 0.030 af, Depth> 0.96" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 1-YR Rainfall=2.01" Area (sf) CN Description * 10,235 98 IMPERVIOUS * 6,320 74 LAWN, LANDSCAPE 16,555 89 Weighted Average 6,320 38.18% Pervious Area 10,235 61.82% Impervious Area Type II 24-hr 1-YR Rainfall=2.01"408 E Upland Road Printed 10/15/2021Prepared by {enter your company name here} Page 3HydroCAD® 10.10-5a s/n 05659 © 2020 HydroCAD Software Solutions LLC Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, MIN Summary for Pond 4P: BIORETENTION PRACTICE Inflow Area = 0.234 ac, 55.08% Impervious, Inflow Depth > 0.84" for 1-YR event Inflow = 0.37 cfs @ 11.97 hrs, Volume= 0.016 af Outflow = 0.04 cfs @ 12.45 hrs, Volume= 0.008 af, Atten= 89%, Lag= 28.6 min Primary = 0.04 cfs @ 12.45 hrs, Volume= 0.008 af Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 893.53' @ 12.45 hrs Surf.Area= 799 sf Storage= 397 cf Plug-Flow detention time= 182.6 min calculated for 0.008 af (47% of inflow) Center-of-Mass det. time= 99.1 min ( 892.1 - 792.9 ) Volume Invert Avail.Storage Storage Description #1 893.00' 793 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 893.00 690 0 0 894.00 895 793 793 Device Routing Invert Outlet Devices #1 Primary 893.50'2.0' long Sharp-Crested Rectangular Weir 2 End Contraction(s) Primary OutFlow Max=0.04 cfs @ 12.45 hrs HW=893.53' (Free Discharge) 1=Sharp-Crested Rectangular Weir (Weir Controls 0.04 cfs @ 0.59 fps) Summary for Link 5L: PROPOSED OUTFALL Inflow Area = 0.614 ac, 59.25% Impervious, Inflow Depth > 0.74" for 1-YR event Inflow = 0.68 cfs @ 11.97 hrs, Volume= 0.038 af Primary = 0.68 cfs @ 11.97 hrs, Volume= 0.038 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 2-YR Rainfall=2.34"408 E Upland Road Printed 10/15/2021Prepared by {enter your company name here} Page 4HydroCAD® 10.10-5a s/n 05659 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: EXISTING Runoff = 1.25 cfs @ 11.97 hrs, Volume= 0.056 af, Depth> 1.09" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 2-YR Rainfall=2.34" Area (sf) CN Description * 14,310 98 IMPERVIOUS * 12,440 74 LAWN, LANDSCAPE 26,750 87 Weighted Average 12,440 46.50% Pervious Area 14,310 53.50% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, MINIMUM Summary for Subcatchment 2S: PROPOSED TO PRACTICE Runoff = 0.47 cfs @ 11.97 hrs, Volume= 0.021 af, Depth> 1.09" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 2-YR Rainfall=2.34" Area (sf) CN Description * 5,615 98 IMPERVIOUS * 4,580 74 LAW, LANDSCAPE 10,195 87 Weighted Average 4,580 44.92% Pervious Area 5,615 55.08% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, MIN Summary for Subcatchment 3S: PROPOSED NOT TO PRACTICE Runoff = 0.86 cfs @ 11.97 hrs, Volume= 0.039 af, Depth> 1.22" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 2-YR Rainfall=2.34" Area (sf) CN Description * 10,235 98 IMPERVIOUS * 6,320 74 LAWN, LANDSCAPE 16,555 89 Weighted Average 6,320 38.18% Pervious Area 10,235 61.82% Impervious Area Type II 24-hr 2-YR Rainfall=2.34"408 E Upland Road Printed 10/15/2021Prepared by {enter your company name here} Page 5HydroCAD® 10.10-5a s/n 05659 © 2020 HydroCAD Software Solutions LLC Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, MIN Summary for Pond 4P: BIORETENTION PRACTICE Inflow Area = 0.234 ac, 55.08% Impervious, Inflow Depth > 1.09" for 2-YR event Inflow = 0.47 cfs @ 11.97 hrs, Volume= 0.021 af Outflow = 0.17 cfs @ 12.11 hrs, Volume= 0.012 af, Atten= 65%, Lag= 8.3 min Primary = 0.17 cfs @ 12.11 hrs, Volume= 0.012 af Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 893.59' @ 12.11 hrs Surf.Area= 810 sf Storage= 440 cf Plug-Flow detention time= 141.8 min calculated for 0.012 af (59% of inflow) Center-of-Mass det. time= 64.9 min ( 852.3 - 787.5 ) Volume Invert Avail.Storage Storage Description #1 893.00' 793 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 893.00 690 0 0 894.00 895 793 793 Device Routing Invert Outlet Devices #1 Primary 893.50'2.0' long Sharp-Crested Rectangular Weir 2 End Contraction(s) Primary OutFlow Max=0.16 cfs @ 12.11 hrs HW=893.58' (Free Discharge) 1=Sharp-Crested Rectangular Weir (Weir Controls 0.16 cfs @ 0.95 fps) Summary for Link 5L: PROPOSED OUTFALL Inflow Area = 0.614 ac, 59.25% Impervious, Inflow Depth > 1.00" for 2-YR event Inflow = 0.86 cfs @ 11.97 hrs, Volume= 0.051 af Primary = 0.86 cfs @ 11.97 hrs, Volume= 0.051 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 10-YR Rainfall=3.43"408 E Upland Road Printed 10/15/2021Prepared by {enter your company name here} Page 6HydroCAD® 10.10-5a s/n 05659 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: EXISTING Runoff = 2.20 cfs @ 11.97 hrs, Volume= 0.101 af, Depth> 1.97" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 10-YR Rainfall=3.43" Area (sf) CN Description * 14,310 98 IMPERVIOUS * 12,440 74 LAWN, LANDSCAPE 26,750 87 Weighted Average 12,440 46.50% Pervious Area 14,310 53.50% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, MINIMUM Summary for Subcatchment 2S: PROPOSED TO PRACTICE Runoff = 0.84 cfs @ 11.97 hrs, Volume= 0.038 af, Depth> 1.97" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 10-YR Rainfall=3.43" Area (sf) CN Description * 5,615 98 IMPERVIOUS * 4,580 74 LAW, LANDSCAPE 10,195 87 Weighted Average 4,580 44.92% Pervious Area 5,615 55.08% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, MIN Summary for Subcatchment 3S: PROPOSED NOT TO PRACTICE Runoff = 1.46 cfs @ 11.97 hrs, Volume= 0.068 af, Depth> 2.14" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 10-YR Rainfall=3.43" Area (sf) CN Description * 10,235 98 IMPERVIOUS * 6,320 74 LAWN, LANDSCAPE 16,555 89 Weighted Average 6,320 38.18% Pervious Area 10,235 61.82% Impervious Area Type II 24-hr 10-YR Rainfall=3.43"408 E Upland Road Printed 10/15/2021Prepared by {enter your company name here} Page 7HydroCAD® 10.10-5a s/n 05659 © 2020 HydroCAD Software Solutions LLC Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, MIN Summary for Pond 4P: BIORETENTION PRACTICE Inflow Area = 0.234 ac, 55.08% Impervious, Inflow Depth > 1.97" for 10-YR event Inflow = 0.84 cfs @ 11.97 hrs, Volume= 0.038 af Outflow = 0.71 cfs @ 12.02 hrs, Volume= 0.030 af, Atten= 15%, Lag= 3.0 min Primary = 0.71 cfs @ 12.02 hrs, Volume= 0.030 af Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 893.73' @ 12.02 hrs Surf.Area= 840 sf Storage= 560 cf Plug-Flow detention time= 93.5 min calculated for 0.030 af (77% of inflow) Center-of-Mass det. time= 35.8 min ( 810.2 - 774.4 ) Volume Invert Avail.Storage Storage Description #1 893.00' 793 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 893.00 690 0 0 894.00 895 793 793 Device Routing Invert Outlet Devices #1 Primary 893.50'2.0' long Sharp-Crested Rectangular Weir 2 End Contraction(s) Primary OutFlow Max=0.69 cfs @ 12.02 hrs HW=893.73' (Free Discharge) 1=Sharp-Crested Rectangular Weir (Weir Controls 0.69 cfs @ 1.56 fps) Summary for Link 5L: PROPOSED OUTFALL Inflow Area = 0.614 ac, 59.25% Impervious, Inflow Depth > 1.90" for 10-YR event Inflow = 2.11 cfs @ 11.98 hrs, Volume= 0.097 af Primary = 2.11 cfs @ 11.98 hrs, Volume= 0.097 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 100-YR Rainfall=5.93"408 E Upland Road Printed 10/15/2021Prepared by {enter your company name here} Page 8HydroCAD® 10.10-5a s/n 05659 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: EXISTING Runoff = 4.46 cfs @ 11.96 hrs, Volume= 0.213 af, Depth> 4.17" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 100-YR Rainfall=5.93" Area (sf) CN Description * 14,310 98 IMPERVIOUS * 12,440 74 LAWN, LANDSCAPE 26,750 87 Weighted Average 12,440 46.50% Pervious Area 14,310 53.50% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, MINIMUM Summary for Subcatchment 2S: PROPOSED TO PRACTICE Runoff = 1.70 cfs @ 11.96 hrs, Volume= 0.081 af, Depth> 4.17" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 100-YR Rainfall=5.93" Area (sf) CN Description * 5,615 98 IMPERVIOUS * 4,580 74 LAW, LANDSCAPE 10,195 87 Weighted Average 4,580 44.92% Pervious Area 5,615 55.08% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, MIN Summary for Subcatchment 3S: PROPOSED NOT TO PRACTICE Runoff = 2.85 cfs @ 11.96 hrs, Volume= 0.139 af, Depth> 4.38" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 100-YR Rainfall=5.93" Area (sf) CN Description * 10,235 98 IMPERVIOUS * 6,320 74 LAWN, LANDSCAPE 16,555 89 Weighted Average 6,320 38.18% Pervious Area 10,235 61.82% Impervious Area Type II 24-hr 100-YR Rainfall=5.93"408 E Upland Road Printed 10/15/2021Prepared by {enter your company name here} Page 9HydroCAD® 10.10-5a s/n 05659 © 2020 HydroCAD Software Solutions LLC Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, MIN Summary for Pond 4P: BIORETENTION PRACTICE Inflow Area = 0.234 ac, 55.08% Impervious, Inflow Depth > 4.17" for 100-YR event Inflow = 1.70 cfs @ 11.96 hrs, Volume= 0.081 af Outflow = 1.56 cfs @ 12.00 hrs, Volume= 0.072 af, Atten= 8%, Lag= 2.1 min Primary = 1.56 cfs @ 12.00 hrs, Volume= 0.072 af Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 893.90' @ 12.00 hrs Surf.Area= 873 sf Storage= 700 cf Plug-Flow detention time= 64.8 min calculated for 0.072 af (89% of inflow) Center-of-Mass det. time= 27.8 min ( 785.0 - 757.2 ) Volume Invert Avail.Storage Storage Description #1 893.00' 793 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 893.00 690 0 0 894.00 895 793 793 Device Routing Invert Outlet Devices #1 Primary 893.50'2.0' long Sharp-Crested Rectangular Weir 2 End Contraction(s) Primary OutFlow Max=1.56 cfs @ 12.00 hrs HW=893.89' (Free Discharge) 1=Sharp-Crested Rectangular Weir (Weir Controls 1.56 cfs @ 2.05 fps) Summary for Link 5L: PROPOSED OUTFALL Inflow Area = 0.614 ac, 59.25% Impervious, Inflow Depth > 4.13" for 100-YR event Inflow = 4.35 cfs @ 11.98 hrs, Volume= 0.211 af Primary = 4.35 cfs @ 11.98 hrs, Volume= 0.211 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs