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2014-10-14 Preliminary Drainage Calculations (129 Pleasant)1S 129 Pleasant 1L Pleasant Street Drainage Diagram for Existing Conditions - 129 PleasantPrepared by GZA GeoEnvironmental, Inc., Printed 10/15/2014 HydroCAD® 9.10 s/n 01286 © 2011 HydroCAD Software Solutions LLC Subcat Reach Pond Link Existing Conditions - 129 Pleasant Printed 10/15/2014Prepared by GZA GeoEnvironmental, Inc. Page 2HydroCAD® 9.10 s/n 01286 © 2011 HydroCAD Software Solutions LLC Area Listing (all nodes) Area (acres) CN Description (subcatchment-numbers) 0.370 61 >75% Grass cover, Good, HSG B (1S) 0.273 98 Paved parking, HSG B (1S) 0.095 98 Roofs, HSG B (1S) 0.737 79 TOTAL AREA Existing Conditions - 129 Pleasant Printed 10/15/2014Prepared by GZA GeoEnvironmental, Inc. Page 3HydroCAD® 9.10 s/n 01286 © 2011 HydroCAD Software Solutions LLC Soil Listing (all nodes) Area (acres) Soil Group Subcatchment Numbers 0.000 HSG A 0.737 HSG B 1S 0.000 HSG C 0.000 HSG D 0.000 Other 0.737 TOTAL AREA Type III 24-hr 2-Year Rainfall=3.00"Existing Conditions - 129 Pleasant Printed 10/15/2014Prepared by GZA GeoEnvironmental, Inc. Page 4HydroCAD® 9.10 s/n 01286 © 2011 HydroCAD Software Solutions LLC 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=32,125 sf 49.88% Impervious Runoff Depth>1.09"Subcatchment 1S: 129 Pleasant Tc=6.0 min CN=79 Runoff=0.99 cfs 0.067 af Inflow=0.99 cfs 0.067 afLink 1L: Pleasant Street Primary=0.99 cfs 0.067 af Total Runoff Area = 0.737 ac Runoff Volume = 0.067 af Average Runoff Depth = 1.09" 50.12% Pervious = 0.370 ac 49.88% Impervious = 0.368 ac Type III 24-hr 2-Year Rainfall=3.00"Existing Conditions - 129 Pleasant Printed 10/15/2014Prepared by GZA GeoEnvironmental, Inc. Page 5HydroCAD® 9.10 s/n 01286 © 2011 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: 129 Pleasant Runoff = 0.99 cfs @ 12.10 hrs, Volume= 0.067 af, Depth> 1.09" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 2-Year Rainfall=3.00" Area (sf) CN Description 4,145 98 Roofs, HSG B 11,880 98 Paved parking, HSG B 16,100 61 >75% Grass cover, Good, HSG B 32,125 79 Weighted Average 16,100 50.12% Pervious Area 16,025 49.88% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 1S: 129 Pleasant Runoff Hydrograph Time (hours) 201918171615141312111098765Flow(cfs)1 0 Type III 24-hr 2-Year Rainfall=3.00" Runoff Area=32,125 sf Runoff Volume=0.067 af Runoff Depth>1.09" Tc=6.0 min CN=79 0.99 cfs Type III 24-hr 2-Year Rainfall=3.00"Existing Conditions - 129 Pleasant Printed 10/15/2014Prepared by GZA GeoEnvironmental, Inc. Page 6HydroCAD® 9.10 s/n 01286 © 2011 HydroCAD Software Solutions LLC Summary for Link 1L: Pleasant Street Inflow Area = 0.737 ac, 49.88% Impervious, Inflow Depth > 1.09" for 2-Year event Inflow = 0.99 cfs @ 12.10 hrs, Volume= 0.067 af Primary = 0.99 cfs @ 12.10 hrs, Volume= 0.067 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Link 1L: Pleasant Street InflowPrimary Hydrograph Time (hours) 201918171615141312111098765Flow(cfs)1 0 Inflow Area=0.737 ac0.99 cfs 0.99 cfs Type III 24-hr 10-Year Rainfall=4.50"Existing Conditions - 129 Pleasant Printed 10/15/2014Prepared by GZA GeoEnvironmental, Inc. Page 7HydroCAD® 9.10 s/n 01286 © 2011 HydroCAD Software Solutions LLC 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=32,125 sf 49.88% Impervious Runoff Depth>2.21"Subcatchment 1S: 129 Pleasant Tc=6.0 min CN=79 Runoff=2.01 cfs 0.136 af Inflow=2.01 cfs 0.136 afLink 1L: Pleasant Street Primary=2.01 cfs 0.136 af Total Runoff Area = 0.737 ac Runoff Volume = 0.136 af Average Runoff Depth = 2.21" 50.12% Pervious = 0.370 ac 49.88% Impervious = 0.368 ac Type III 24-hr 10-Year Rainfall=4.50"Existing Conditions - 129 Pleasant Printed 10/15/2014Prepared by GZA GeoEnvironmental, Inc. Page 8HydroCAD® 9.10 s/n 01286 © 2011 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: 129 Pleasant Runoff = 2.01 cfs @ 12.09 hrs, Volume= 0.136 af, Depth> 2.21" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 10-Year Rainfall=4.50" Area (sf) CN Description 4,145 98 Roofs, HSG B 11,880 98 Paved parking, HSG B 16,100 61 >75% Grass cover, Good, HSG B 32,125 79 Weighted Average 16,100 50.12% Pervious Area 16,025 49.88% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 1S: 129 Pleasant Runoff Hydrograph Time (hours) 201918171615141312111098765Flow(cfs)2 1 0 Type III 24-hr 10-Year Rainfall=4.50" Runoff Area=32,125 sf Runoff Volume=0.136 af Runoff Depth>2.21" Tc=6.0 min CN=79 2.01 cfs Type III 24-hr 10-Year Rainfall=4.50"Existing Conditions - 129 Pleasant Printed 10/15/2014Prepared by GZA GeoEnvironmental, Inc. Page 9HydroCAD® 9.10 s/n 01286 © 2011 HydroCAD Software Solutions LLC Summary for Link 1L: Pleasant Street Inflow Area = 0.737 ac, 49.88% Impervious, Inflow Depth > 2.21" for 10-Year event Inflow = 2.01 cfs @ 12.09 hrs, Volume= 0.136 af Primary = 2.01 cfs @ 12.09 hrs, Volume= 0.136 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Link 1L: Pleasant Street InflowPrimary Hydrograph Time (hours) 201918171615141312111098765Flow(cfs)2 1 0 Inflow Area=0.737 ac2.01 cfs 2.01 cfs Type III 24-hr 100-Year Rainfall=6.40"Existing Conditions - 129 Pleasant Printed 10/15/2014Prepared by GZA GeoEnvironmental, Inc. Page 10HydroCAD® 9.10 s/n 01286 © 2011 HydroCAD Software Solutions LLC 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=32,125 sf 49.88% Impervious Runoff Depth>3.79"Subcatchment 1S: 129 Pleasant Tc=6.0 min CN=79 Runoff=3.41 cfs 0.233 af Inflow=3.41 cfs 0.233 afLink 1L: Pleasant Street Primary=3.41 cfs 0.233 af Total Runoff Area = 0.737 ac Runoff Volume = 0.233 af Average Runoff Depth = 3.79" 50.12% Pervious = 0.370 ac 49.88% Impervious = 0.368 ac Type III 24-hr 100-Year Rainfall=6.40"Existing Conditions - 129 Pleasant Printed 10/15/2014Prepared by GZA GeoEnvironmental, Inc. Page 11HydroCAD® 9.10 s/n 01286 © 2011 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: 129 Pleasant Runoff = 3.41 cfs @ 12.09 hrs, Volume= 0.233 af, Depth> 3.79" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 100-Year Rainfall=6.40" Area (sf) CN Description 4,145 98 Roofs, HSG B 11,880 98 Paved parking, HSG B 16,100 61 >75% Grass cover, Good, HSG B 32,125 79 Weighted Average 16,100 50.12% Pervious Area 16,025 49.88% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 1S: 129 Pleasant Runoff Hydrograph Time (hours) 201918171615141312111098765Flow(cfs)3 2 1 0 Type III 24-hr 100-Year Rainfall=6.40" Runoff Area=32,125 sf Runoff Volume=0.233 af Runoff Depth>3.79" Tc=6.0 min CN=79 3.41 cfs Type III 24-hr 100-Year Rainfall=6.40"Existing Conditions - 129 Pleasant Printed 10/15/2014Prepared by GZA GeoEnvironmental, Inc. Page 12HydroCAD® 9.10 s/n 01286 © 2011 HydroCAD Software Solutions LLC Summary for Link 1L: Pleasant Street Inflow Area = 0.737 ac, 49.88% Impervious, Inflow Depth > 3.79" for 100-Year event Inflow = 3.41 cfs @ 12.09 hrs, Volume= 0.233 af Primary = 3.41 cfs @ 12.09 hrs, Volume= 0.233 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Link 1L: Pleasant Street InflowPrimary Hydrograph Time (hours) 201918171615141312111098765Flow(cfs)3 2 1 0 Inflow Area=0.737 ac3.41 cfs 3.41 cfs 1S Portion of 129 Pleasant Draining to the Infiltration Basin 2S Portion of 129 Pleasant Draining Directly to Pleasant Street 1P Infiltration Basin 1L Pleasant Street Drainage Diagram for Proposed Conditions - 129 PleasantPrepared by GZA GeoEnvironmental, Inc., Printed 10/15/2014 HydroCAD® 9.10 s/n 01286 © 2011 HydroCAD Software Solutions LLC Subcat Reach Pond Link Proposed Conditions - 129 Pleasant Printed 10/15/2014Prepared by GZA GeoEnvironmental, Inc. Page 2HydroCAD® 9.10 s/n 01286 © 2011 HydroCAD Software Solutions LLC Area Listing (all nodes) Area (acres) CN Description (subcatchment-numbers) 0.033 40 Gravel Bed Btwn Bldg & Bikepath, HSG B (1S) 0.092 61 >75% Grass cover, Good, HSG B (1S) 0.119 70 Planting Beds, HSG B (1S, 2S) 0.179 98 Paved parking, HSG B (1S, 2S) 0.315 98 Roofs, HSG B (1S) 0.737 86 TOTAL AREA Proposed Conditions - 129 Pleasant Printed 10/15/2014Prepared by GZA GeoEnvironmental, Inc. Page 3HydroCAD® 9.10 s/n 01286 © 2011 HydroCAD Software Solutions LLC Soil Listing (all nodes) Area (acres) Soil Group Subcatchment Numbers 0.000 HSG A 0.737 HSG B 1S, 2S 0.000 HSG C 0.000 HSG D 0.000 Other 0.737 TOTAL AREA Proposed Conditions - 129 Pleasant Printed 10/15/2014Prepared by GZA GeoEnvironmental, Inc. Page 4HydroCAD® 9.10 s/n 01286 © 2011 HydroCAD Software Solutions LLC Pipe Listing (all nodes) Line# Node Number In-Invert (feet) Out-Invert (feet) Length (feet) Slope (ft/ft) n Diam/Width (inches) Height (inches) Fill (inches) 1 1P 94.00 93.59 41.0 0.0100 0.013 12.0 0.0 0.0 Type III 24-hr 2-Year Rainfall=3.00"Proposed Conditions - 129 Pleasant Printed 10/15/2014Prepared by GZA GeoEnvironmental, Inc. Page 5HydroCAD® 9.10 s/n 01286 © 2011 HydroCAD Software Solutions LLC Time span=5.00-20.00 hrs, dt=0.01 hrs, 1501 points Runoff by SCS TR-20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=29,165 sf 67.08% Impervious Runoff Depth>1.55"Subcatchment 1S: Portion of 129 Pleasant Tc=6.0 min CN=86 Runoff=1.31 cfs 0.086 af Runoff Area=2,960 sf 64.86% Impervious Runoff Depth>1.70"Subcatchment 2S: Portion of 129 Pleasant Tc=6.0 min CN=88 Runoff=0.14 cfs 0.010 af Peak Elev=99.93' Storage=2,576 cf Inflow=1.31 cfs 0.086 afPond 1P: Infiltration Basin Discarded=0.05 cfs 0.033 af Primary=0.00 cfs 0.000 af Outflow=0.05 cfs 0.033 af Inflow=0.14 cfs 0.010 afLink 1L: Pleasant Street Primary=0.14 cfs 0.010 af Total Runoff Area = 0.737 ac Runoff Volume = 0.096 af Average Runoff Depth = 1.56" 33.12% Pervious = 0.244 ac 66.88% Impervious = 0.493 ac Type III 24-hr 2-Year Rainfall=3.00"Proposed Conditions - 129 Pleasant Printed 10/15/2014Prepared by GZA GeoEnvironmental, Inc. Page 6HydroCAD® 9.10 s/n 01286 © 2011 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: Portion of 129 Pleasant Draining to the Infiltration Basin Runoff = 1.31 cfs @ 12.09 hrs, Volume= 0.086 af, Depth> 1.55" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.01 hrs Type III 24-hr 2-Year Rainfall=3.00" Area (sf) CN Description 13,700 98 Roofs, HSG B 5,865 98 Paved parking, HSG B 4,025 61 >75% Grass cover, Good, HSG B * 1,450 40 Gravel Bed Btwn Bldg & Bikepath, HSG B * 4,125 70 Planting Beds, HSG B 29,165 86 Weighted Average 9,600 32.92% Pervious Area 19,565 67.08% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 1S: Portion of 129 Pleasant Draining to the Infiltration Basin Runoff Hydrograph Time (hours) 201918171615141312111098765Flow(cfs)1 0 Type III 24-hr 2-Year Rainfall=3.00" Runoff Area=29,165 sf Runoff Volume=0.086 af Runoff Depth>1.55" Tc=6.0 min CN=86 1.31 cfs Type III 24-hr 2-Year Rainfall=3.00"Proposed Conditions - 129 Pleasant Printed 10/15/2014Prepared by GZA GeoEnvironmental, Inc. Page 7HydroCAD® 9.10 s/n 01286 © 2011 HydroCAD Software Solutions LLC Summary for Subcatchment 2S: Portion of 129 Pleasant Draining Directly to Pleasant Street Runoff = 0.14 cfs @ 12.09 hrs, Volume= 0.010 af, Depth> 1.70" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.01 hrs Type III 24-hr 2-Year Rainfall=3.00" Area (sf) CN Description 1,920 98 Paved parking, HSG B * 1,040 70 Planting Beds, HSG B 2,960 88 Weighted Average 1,040 35.14% Pervious Area 1,920 64.86% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 2S: Portion of 129 Pleasant Draining Directly to Pleasant Street Runoff Hydrograph Time (hours) 201918171615141312111098765Flow(cfs)0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Type III 24-hr 2-Year Rainfall=3.00" Runoff Area=2,960 sf Runoff Volume=0.010 af Runoff Depth>1.70" Tc=6.0 min CN=88 0.14 cfs Type III 24-hr 2-Year Rainfall=3.00"Proposed Conditions - 129 Pleasant Printed 10/15/2014Prepared by GZA GeoEnvironmental, Inc. Page 8HydroCAD® 9.10 s/n 01286 © 2011 HydroCAD Software Solutions LLC Summary for Pond 1P: Infiltration Basin Inflow Area = 0.670 ac, 67.08% Impervious, Inflow Depth > 1.55" for 2-Year event Inflow = 1.31 cfs @ 12.09 hrs, Volume= 0.086 af Outflow = 0.05 cfs @ 15.85 hrs, Volume= 0.033 af, Atten= 96%, Lag= 225.7 min Discarded = 0.05 cfs @ 15.85 hrs, Volume= 0.033 af Primary = 0.00 cfs @ 5.00 hrs, Volume= 0.000 af Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.01 hrs Peak Elev= 99.93' @ 15.85 hrs Surf.Area= 4,016 sf Storage= 2,576 cf Plug-Flow detention time= 241.7 min calculated for 0.033 af (38% of inflow) Center-of-Mass det. time= 151.1 min ( 940.8 - 789.7 ) Volume Invert Avail.Storage Storage Description #1 95.00' 1,520 cf 3.50'W x 190.00'L x 3.50'H Prismatoid Z=1.0 4,755 cf Overall - 149 cf Embedded = 4,606 cf x 33.0% Voids #2 97.00' 149 cf 12.0" D x 190.0'L Pipe Storage Inside #1 #3 99.00' 6,293 cf Custom Stage Data (Prismatic)Listed below (Recalc) 7,962 cf Total Available Storage Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 99.00 0 0 0 100.00 2,090 1,045 1,045 101.00 8,405 5,248 6,293 Device Routing Invert Outlet Devices #1 Device 3 100.00'4.0' long x 0.5' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 Coef. (English) 2.80 2.92 3.08 3.30 3.32 #2 Discarded 95.00'0.520 in/hr Exfiltration over Surface area #3 Primary 94.00'12.0" Round Culvert L= 41.0' CPP, square edge headwall, Ke= 0.500 Inlet / Outlet Invert= 94.00' / 93.59' S= 0.0100 '/' Cc= 0.900 n= 0.013 Corrugated PE, smooth interior Discarded OutFlow Max=0.05 cfs @ 15.85 hrs HW=99.93' (Free Discharge) 2=Exfiltration (Exfiltration Controls 0.05 cfs) Primary OutFlow Max=0.00 cfs @ 5.00 hrs HW=95.00' TW=97.00' (Fixed TW Elev= 97.00') 3=Culvert ( Controls 0.00 cfs) 1=Broad-Crested Rectangular Weir ( Controls 0.00 cfs) Type III 24-hr 2-Year Rainfall=3.00"Proposed Conditions - 129 Pleasant Printed 10/15/2014Prepared by GZA GeoEnvironmental, Inc. Page 9HydroCAD® 9.10 s/n 01286 © 2011 HydroCAD Software Solutions LLC Pond 1P: Infiltration Basin Inflow Outflow Discarded Primary Hydrograph Time (hours)201918171615141312111098765Flow(cfs)1 0 Inflow Area=0.670 ac Peak Elev=99.93' Storage=2,576 cf 1.31 cfs 0.05 cfs 0.05 cfs 0.00 cfs Type III 24-hr 2-Year Rainfall=3.00"Proposed Conditions - 129 Pleasant Printed 10/15/2014Prepared by GZA GeoEnvironmental, Inc. Page 10HydroCAD® 9.10 s/n 01286 © 2011 HydroCAD Software Solutions LLC Summary for Link 1L: Pleasant Street Inflow Area = 0.737 ac, 66.88% Impervious, Inflow Depth > 0.16" for 2-Year event Inflow = 0.14 cfs @ 12.09 hrs, Volume= 0.010 af Primary = 0.14 cfs @ 12.09 hrs, Volume= 0.010 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.01 hrs Link 1L: Pleasant Street InflowPrimary Hydrograph Time (hours) 201918171615141312111098765Flow(cfs)0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Inflow Area=0.737 ac0.14 cfs 0.14 cfs Type III 24-hr 10-Year Rainfall=4.50"Proposed Conditions - 129 Pleasant Printed 10/15/2014Prepared by GZA GeoEnvironmental, Inc. Page 11HydroCAD® 9.10 s/n 01286 © 2011 HydroCAD Software Solutions LLC Time span=5.00-20.00 hrs, dt=0.01 hrs, 1501 points Runoff by SCS TR-20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=29,165 sf 67.08% Impervious Runoff Depth>2.82"Subcatchment 1S: Portion of 129 Pleasant Tc=6.0 min CN=86 Runoff=2.34 cfs 0.157 af Runoff Area=2,960 sf 64.86% Impervious Runoff Depth>3.01"Subcatchment 2S: Portion of 129 Pleasant Tc=6.0 min CN=88 Runoff=0.25 cfs 0.017 af Peak Elev=100.17' Storage=3,162 cf Inflow=2.34 cfs 0.157 afPond 1P: Infiltration Basin Discarded=0.06 cfs 0.039 af Primary=0.79 cfs 0.058 af Outflow=0.86 cfs 0.097 af Inflow=0.88 cfs 0.075 afLink 1L: Pleasant Street Primary=0.88 cfs 0.075 af Total Runoff Area = 0.737 ac Runoff Volume = 0.174 af Average Runoff Depth = 2.84" 33.12% Pervious = 0.244 ac 66.88% Impervious = 0.493 ac Type III 24-hr 10-Year Rainfall=4.50"Proposed Conditions - 129 Pleasant Printed 10/15/2014Prepared by GZA GeoEnvironmental, Inc. Page 12HydroCAD® 9.10 s/n 01286 © 2011 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: Portion of 129 Pleasant Draining to the Infiltration Basin Runoff = 2.34 cfs @ 12.09 hrs, Volume= 0.157 af, Depth> 2.82" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.01 hrs Type III 24-hr 10-Year Rainfall=4.50" Area (sf) CN Description 13,700 98 Roofs, HSG B 5,865 98 Paved parking, HSG B 4,025 61 >75% Grass cover, Good, HSG B * 1,450 40 Gravel Bed Btwn Bldg & Bikepath, HSG B * 4,125 70 Planting Beds, HSG B 29,165 86 Weighted Average 9,600 32.92% Pervious Area 19,565 67.08% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 1S: Portion of 129 Pleasant Draining to the Infiltration Basin Runoff Hydrograph Time (hours) 201918171615141312111098765Flow(cfs)2 1 0 Type III 24-hr 10-Year Rainfall=4.50" Runoff Area=29,165 sf Runoff Volume=0.157 af Runoff Depth>2.82" Tc=6.0 min CN=86 2.34 cfs Type III 24-hr 10-Year Rainfall=4.50"Proposed Conditions - 129 Pleasant Printed 10/15/2014Prepared by GZA GeoEnvironmental, Inc. Page 13HydroCAD® 9.10 s/n 01286 © 2011 HydroCAD Software Solutions LLC Summary for Subcatchment 2S: Portion of 129 Pleasant Draining Directly to Pleasant Street Runoff = 0.25 cfs @ 12.09 hrs, Volume= 0.017 af, Depth> 3.01" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.01 hrs Type III 24-hr 10-Year Rainfall=4.50" Area (sf) CN Description 1,920 98 Paved parking, HSG B * 1,040 70 Planting Beds, HSG B 2,960 88 Weighted Average 1,040 35.14% Pervious Area 1,920 64.86% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 2S: Portion of 129 Pleasant Draining Directly to Pleasant Street Runoff Hydrograph Time (hours) 201918171615141312111098765Flow(cfs)0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Type III 24-hr 10-Year Rainfall=4.50" Runoff Area=2,960 sf Runoff Volume=0.017 af Runoff Depth>3.01" Tc=6.0 min CN=88 0.25 cfs Type III 24-hr 10-Year Rainfall=4.50"Proposed Conditions - 129 Pleasant Printed 10/15/2014Prepared by GZA GeoEnvironmental, Inc. Page 14HydroCAD® 9.10 s/n 01286 © 2011 HydroCAD Software Solutions LLC Summary for Pond 1P: Infiltration Basin Inflow Area = 0.670 ac, 67.08% Impervious, Inflow Depth > 2.82" for 10-Year event Inflow = 2.34 cfs @ 12.09 hrs, Volume= 0.157 af Outflow = 0.86 cfs @ 12.35 hrs, Volume= 0.097 af, Atten= 63%, Lag= 16.0 min Discarded = 0.06 cfs @ 12.35 hrs, Volume= 0.039 af Primary = 0.79 cfs @ 12.35 hrs, Volume= 0.058 af Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.01 hrs Peak Elev= 100.17' @ 12.35 hrs Surf.Area= 5,234 sf Storage= 3,162 cf Plug-Flow detention time= 140.3 min calculated for 0.097 af (61% of inflow) Center-of-Mass det. time= 66.6 min ( 842.4 - 775.8 ) Volume Invert Avail.Storage Storage Description #1 95.00' 1,520 cf 3.50'W x 190.00'L x 3.50'H Prismatoid Z=1.0 4,755 cf Overall - 149 cf Embedded = 4,606 cf x 33.0% Voids #2 97.00' 149 cf 12.0" D x 190.0'L Pipe Storage Inside #1 #3 99.00' 6,293 cf Custom Stage Data (Prismatic)Listed below (Recalc) 7,962 cf Total Available Storage Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 99.00 0 0 0 100.00 2,090 1,045 1,045 101.00 8,405 5,248 6,293 Device Routing Invert Outlet Devices #1 Device 3 100.00'4.0' long x 0.5' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 Coef. (English) 2.80 2.92 3.08 3.30 3.32 #2 Discarded 95.00'0.520 in/hr Exfiltration over Surface area #3 Primary 94.00'12.0" Round Culvert L= 41.0' CPP, square edge headwall, Ke= 0.500 Inlet / Outlet Invert= 94.00' / 93.59' S= 0.0100 '/' Cc= 0.900 n= 0.013 Corrugated PE, smooth interior Discarded OutFlow Max=0.06 cfs @ 12.35 hrs HW=100.17' (Free Discharge) 2=Exfiltration (Exfiltration Controls 0.06 cfs) Primary OutFlow Max=0.79 cfs @ 12.35 hrs HW=100.17' TW=97.00' (Fixed TW Elev= 97.00') 3=Culvert (Passes 0.79 cfs of 6.72 cfs potential flow) 1=Broad-Crested Rectangular Weir (Weir Controls 0.79 cfs @ 1.16 fps) Type III 24-hr 10-Year Rainfall=4.50"Proposed Conditions - 129 Pleasant Printed 10/15/2014Prepared by GZA GeoEnvironmental, Inc. Page 15HydroCAD® 9.10 s/n 01286 © 2011 HydroCAD Software Solutions LLC Pond 1P: Infiltration Basin Inflow Outflow Discarded Primary Hydrograph Time (hours)201918171615141312111098765Flow(cfs)2 1 0 Inflow Area=0.670 ac Peak Elev=100.17' Storage=3,162 cf 2.34 cfs 0.86 cfs 0.06 cfs 0.79 cfs Type III 24-hr 10-Year Rainfall=4.50"Proposed Conditions - 129 Pleasant Printed 10/15/2014Prepared by GZA GeoEnvironmental, Inc. Page 16HydroCAD® 9.10 s/n 01286 © 2011 HydroCAD Software Solutions LLC Summary for Link 1L: Pleasant Street Inflow Area = 0.737 ac, 66.88% Impervious, Inflow Depth > 1.21" for 10-Year event Inflow = 0.88 cfs @ 12.34 hrs, Volume= 0.075 af Primary = 0.88 cfs @ 12.34 hrs, Volume= 0.075 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.01 hrs Link 1L: Pleasant Street InflowPrimary Hydrograph Time (hours) 201918171615141312111098765Flow(cfs)0.95 0.9 0.85 0.8 0.75 0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Inflow Area=0.737 ac0.88 cfs 0.88 cfs Type III 24-hr 100-Year Rainfall=6.40"Proposed Conditions - 129 Pleasant Printed 10/15/2014Prepared by GZA GeoEnvironmental, Inc. Page 17HydroCAD® 9.10 s/n 01286 © 2011 HydroCAD Software Solutions LLC Time span=5.00-20.00 hrs, dt=0.01 hrs, 1501 points Runoff by SCS TR-20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=29,165 sf 67.08% Impervious Runoff Depth>4.52"Subcatchment 1S: Portion of 129 Pleasant Tc=6.0 min CN=86 Runoff=3.66 cfs 0.252 af Runoff Area=2,960 sf 64.86% Impervious Runoff Depth>4.73"Subcatchment 2S: Portion of 129 Pleasant Tc=6.0 min CN=88 Runoff=0.38 cfs 0.027 af Peak Elev=100.36' Storage=3,865 cf Inflow=3.66 cfs 0.252 afPond 1P: Infiltration Basin Discarded=0.08 cfs 0.044 af Primary=2.48 cfs 0.146 af Outflow=2.56 cfs 0.190 af Inflow=2.76 cfs 0.173 afLink 1L: Pleasant Street Primary=2.76 cfs 0.173 af Total Runoff Area = 0.737 ac Runoff Volume = 0.279 af Average Runoff Depth = 4.54" 33.12% Pervious = 0.244 ac 66.88% Impervious = 0.493 ac Type III 24-hr 100-Year Rainfall=6.40"Proposed Conditions - 129 Pleasant Printed 10/15/2014Prepared by GZA GeoEnvironmental, Inc. Page 18HydroCAD® 9.10 s/n 01286 © 2011 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: Portion of 129 Pleasant Draining to the Infiltration Basin Runoff = 3.66 cfs @ 12.09 hrs, Volume= 0.252 af, Depth> 4.52" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.01 hrs Type III 24-hr 100-Year Rainfall=6.40" Area (sf) CN Description 13,700 98 Roofs, HSG B 5,865 98 Paved parking, HSG B 4,025 61 >75% Grass cover, Good, HSG B * 1,450 40 Gravel Bed Btwn Bldg & Bikepath, HSG B * 4,125 70 Planting Beds, HSG B 29,165 86 Weighted Average 9,600 32.92% Pervious Area 19,565 67.08% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 1S: Portion of 129 Pleasant Draining to the Infiltration Basin Runoff Hydrograph Time (hours) 201918171615141312111098765Flow(cfs)4 3 2 1 0 Type III 24-hr 100-Year Rainfall=6.40" Runoff Area=29,165 sf Runoff Volume=0.252 af Runoff Depth>4.52" Tc=6.0 min CN=86 3.66 cfs Type III 24-hr 100-Year Rainfall=6.40"Proposed Conditions - 129 Pleasant Printed 10/15/2014Prepared by GZA GeoEnvironmental, Inc. Page 19HydroCAD® 9.10 s/n 01286 © 2011 HydroCAD Software Solutions LLC Summary for Subcatchment 2S: Portion of 129 Pleasant Draining Directly to Pleasant Street Runoff = 0.38 cfs @ 12.08 hrs, Volume= 0.027 af, Depth> 4.73" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.01 hrs Type III 24-hr 100-Year Rainfall=6.40" Area (sf) CN Description 1,920 98 Paved parking, HSG B * 1,040 70 Planting Beds, HSG B 2,960 88 Weighted Average 1,040 35.14% Pervious Area 1,920 64.86% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 2S: Portion of 129 Pleasant Draining Directly to Pleasant Street Runoff Hydrograph Time (hours) 201918171615141312111098765Flow(cfs)0.42 0.4 0.38 0.36 0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Type III 24-hr 100-Year Rainfall=6.40" Runoff Area=2,960 sf Runoff Volume=0.027 af Runoff Depth>4.73" Tc=6.0 min CN=88 0.38 cfs Type III 24-hr 100-Year Rainfall=6.40"Proposed Conditions - 129 Pleasant Printed 10/15/2014Prepared by GZA GeoEnvironmental, Inc. Page 20HydroCAD® 9.10 s/n 01286 © 2011 HydroCAD Software Solutions LLC Summary for Pond 1P: Infiltration Basin Inflow Area = 0.670 ac, 67.08% Impervious, Inflow Depth > 4.52" for 100-Year event Inflow = 3.66 cfs @ 12.09 hrs, Volume= 0.252 af Outflow = 2.56 cfs @ 12.17 hrs, Volume= 0.190 af, Atten= 30%, Lag= 4.8 min Discarded = 0.08 cfs @ 12.17 hrs, Volume= 0.044 af Primary = 2.48 cfs @ 12.17 hrs, Volume= 0.146 af Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.01 hrs Peak Elev= 100.36' @ 12.17 hrs Surf.Area= 6,416 sf Storage= 3,865 cf Plug-Flow detention time= 104.7 min calculated for 0.190 af (75% of inflow) Center-of-Mass det. time= 44.8 min ( 809.3 - 764.5 ) Volume Invert Avail.Storage Storage Description #1 95.00' 1,520 cf 3.50'W x 190.00'L x 3.50'H Prismatoid Z=1.0 4,755 cf Overall - 149 cf Embedded = 4,606 cf x 33.0% Voids #2 97.00' 149 cf 12.0" D x 190.0'L Pipe Storage Inside #1 #3 99.00' 6,293 cf Custom Stage Data (Prismatic)Listed below (Recalc) 7,962 cf Total Available Storage Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 99.00 0 0 0 100.00 2,090 1,045 1,045 101.00 8,405 5,248 6,293 Device Routing Invert Outlet Devices #1 Device 3 100.00'4.0' long x 0.5' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 Coef. (English) 2.80 2.92 3.08 3.30 3.32 #2 Discarded 95.00'0.520 in/hr Exfiltration over Surface area #3 Primary 94.00'12.0" Round Culvert L= 41.0' CPP, square edge headwall, Ke= 0.500 Inlet / Outlet Invert= 94.00' / 93.59' S= 0.0100 '/' Cc= 0.900 n= 0.013 Corrugated PE, smooth interior Discarded OutFlow Max=0.08 cfs @ 12.17 hrs HW=100.36' (Free Discharge) 2=Exfiltration (Exfiltration Controls 0.08 cfs) Primary OutFlow Max=2.47 cfs @ 12.17 hrs HW=100.36' TW=97.00' (Fixed TW Elev= 97.00') 3=Culvert (Passes 2.47 cfs of 6.92 cfs potential flow) 1=Broad-Crested Rectangular Weir (Weir Controls 2.47 cfs @ 1.73 fps) Type III 24-hr 100-Year Rainfall=6.40"Proposed Conditions - 129 Pleasant Printed 10/15/2014Prepared by GZA GeoEnvironmental, Inc. Page 21HydroCAD® 9.10 s/n 01286 © 2011 HydroCAD Software Solutions LLC Pond 1P: Infiltration Basin Inflow Outflow Discarded Primary Hydrograph Time (hours)201918171615141312111098765Flow(cfs)4 3 2 1 0 Inflow Area=0.670 ac Peak Elev=100.36' Storage=3,865 cf 3.66 cfs 2.56 cfs 0.08 cfs 2.48 cfs Type III 24-hr 100-Year Rainfall=6.40"Proposed Conditions - 129 Pleasant Printed 10/15/2014Prepared by GZA GeoEnvironmental, Inc. Page 22HydroCAD® 9.10 s/n 01286 © 2011 HydroCAD Software Solutions LLC Summary for Link 1L: Pleasant Street Inflow Area = 0.737 ac, 66.88% Impervious, Inflow Depth > 2.82" for 100-Year event Inflow = 2.76 cfs @ 12.15 hrs, Volume= 0.173 af Primary = 2.76 cfs @ 12.15 hrs, Volume= 0.173 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.01 hrs Link 1L: Pleasant Street InflowPrimary Hydrograph Time (hours) 201918171615141312111098765Flow(cfs)3 2 1 0 Inflow Area=0.737 ac2.76 cfs 2.76 cfs