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Stormwater Plan STORMWATER MANAGEMENT for SKY-ZONE TRAMPOLINE PARK SITE PLAN FOR ADDITIONAL PARKING CORINTH ROAD QUEENSBURY, N.Y. HYDROCAD CALCULATIONS SHOWING THAT THE ADDITIONAL RUNOFF FROM THE PROPOSED 34 ADDED PARKING SPACES TO SUBCATCHMENTS #311 AND #4S DOES NOT HAVE ANY SIGNIFICANT EFFECT ON THE DOWNSTREAM DRAINAGE STRUCTURES INSTALLED AS PART OF THE ORIGINAL SITE PLAN. FOR SITE PLAN MODIFICATION APPLICATION 1/15/2018 3a 1 b MIDDLE FRONT CB2 8' 8'DRYWELL NORTHEAST NORTHEAST FRONT PARKING INFILTRATION BASIN PARKING ce �3b 0 EAST FRONT CB3 PARKING �4—S- ---� 712� EAST AND REAR OF SWALE SOUTHEAST 8'X 4' DRYWELL SITE INFILTRATION BASIN Sub�at Reach on -- in k] Drainage Diagram for 47609-SKY-ZONE-ADD PARKING Prepared by{enter your company name here}, Printed 1/8/2018 HydroCAD®9.10 s/n 03732 ©2010 HydroCAD Software Solutions LLC 47609-SKY-ZONE-ADD PARKING Type 1124-hr 100-YEAR Rainfall=6.00" Prepared by {enter your company name here} Printed 1/8/2018 H droCAD®9.10 s/n 03732 ©2010 H droCAD Software Solutions LLC Page 2 Time span=0.00-48.00 hrs, dt=0.05 hrs, 961 points Runoff by SCS TR-20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 1b: NORTHEAST FRONT Runoff Area=2,926 sf 35.37% Impervious Runoff Depth=1.92" Flow Length=20' Slope=0.0150 '/' Tc=0.4 min CN=60 Runoff=0.26 cfs 0.011 of Subcatchment 3a: MIDDLE FRONT Runoff Area=6,941 sf 85.03% Impervious Runoff Depth=4.74" Flow Length=45' Slope=0.0100 '/' Tc=1.0 min CN=89 Runoff=1.39 cfs 0.063 of Subcatchment 3b: EAST FRONT PARKING Runoff Area=12.265 sf 83.30% Impervious Runoff Depth=4.63" Flow Length=225' Tc=6.5 min CN=88 Runoff=2.07 cfs 0.109 of Subcatchment 4S: EAST AND REAR OF Runoff Area=52.700 sf 27.38% Impervious Runoff Depth=1.52" Flow Length=150' Tc=4.0 min CN=55 Runoff=3.34 cfs 0.153 of Reach 12R: SWALE Avg. Flow Depth=1.04' Max Vel=0.57 fps Inflow=3.34 cfs 0.153 of n=0.150 L=220.0' S=0.0060 '/' Capacity=2.23 cfs Outflow=2.35 cfs 0.153 of Pond 1bP: NORTHEAST INFILTRATION BASIN Peak Elev=382.47' Storage=16 cf Inflow=0.26 cfs 0.011 of Discarded=0.24 cfs 0.011 of Primary=0.00 cfs 0.000 of Outflow-0.24 cfs 0.011 of Pond 3P: 8'X 8' DRYWELL Peak Elev=379.87' Storage=835 cf Inflow=3.13 cfs 0.171 of Outflow=2.34 cfs 0.171 of Pond 4P: SOUTHEAST INFILTRATION BASIN Peak EIev=381.07' Storage=204 cf Inflow=2.35 cfs 0.153 of Discarded=2.08 cfs 0.153 of Primary=0.00 cfs 0.000 of Outflow=2.08 cfs 0.153 of Pond 5P: 8'X 4' DRYWELL Peak EIev=374.70' Storage=0 cf Inflow=0.00 cfs 0.000 of Outflow=0.00 cfs 0.000 of Pond 9P: CB2 Peak EIev=380.32' Inflow=1.39 cfs 0.063 of 12.0" Round Culvert n=0.010 L=60.0' S=0.0192 '/' Outflow=1.39 cfs 0.063 of Pond 10P: CB3 Peak EIev=379.77' Inflow=2.07 cfs 0.109 of 12.0" Round Culvert n=0.010 L=68.0' S=0.0051 T Outflow=2.07 cfs 0.109 of Total Runoff Area= 1.718 ac Runoff Volume= 0.335 of Average Runoff Depth =2.34" 57.79%Pervious= 0.993 ac 42.21%Impervious= 0.725 ac 47609-SKY-ZONE-ADD PARKING Type 11 24-hr 100-YEAR Rainfall=6.00" Prepared by{enter your company name here} Printed 1/8/2018 HydroCADO 9.10 s/n 03732 ©2010 HydroCAD Software Solutions LLC Pate 3 Summary for Subcatchment 1b: NORTHEAST FRONT PARKING Runoff = 0.26 cfs @ 11.90 hrs, Volume= 0.011 af, Depth= 1.92" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Type II 24-hr 100-YEAR Rainfall=6.00" Area (sf) CN Description 1,035 98 PAVEMENT 1,891 39 >75% Grass cover, Good HSG A 2,926 60 Weighted Average 1,891 64.63% Pervious Area 1,035 35.37% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) ft/ft) ft/sec (cfs) 0.4 20 0.0150 0.77 Sheet Flow, ACROSS PAVEMENT Smooth surfaces n= 0.011 P2= 2.40" Summary for Subcatchment 3a: MIDDLE FRONT PARKING Runoff = 1.39 cfs @ 11.90 hrs, Volume= 0.063 af,_Depth= 4.74" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Type II 24-hr 100-YEAR Rainfall=6.00" Area (sf) CN Description 5,902 98 PAVEMENT 1,039 39 >75% Grass cover. Good. HSG A _ 6,941 89 Weighted Average 1,039 14.97% Pervious Area 5,902 85.03% Impervious Area Tc Length Slope Velocity Capacity Description min feet ft/ft ft/sec cfs 1.0 45 0.0100 0.77 Sheet Flow, ACROSS PAVEMENT TO CB Smooth surfaces n= 0.011 P2= 2.40" Summary for Subcatchment 3b: EAST FRONT PARKING Runoff = 2.07 cfs @ 11.97 hrs, Volume= 0.109 af, Depth= 4.63" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Type 11 24-hr 100-YEAR Rainfall=6.00" 47609-SKY-ZONE-ADD PARKING Type //24-hr 100-YEAR Rainfall=6.00" Prepared by{enter your company name here} Printed 1/8/2018 H droCADO 9.10 s/n 03732 ©2010 H droCAD Software Solutions LLC Page 4 Area (sf) CN Description 10,217 98 PAVEMENT 2,048 39 >75% Grass cover, Good, HSG A 12,265 88 Weighted Average 2,048 16.70% Pervious Area 10,217 83.30% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec cfs 1.0 45 0.0100 0.77 Sheet Flow,ACROSS PAVEMENT TO SWALE Smooth surfaces n= 0.011 P2= 2.40" 5.5 180 0.0130 0.54 1.09 Channel Flow, SWALE TO INLET Area= 2.0 sf Perim= 6.0' r= 0.33' n= 0.150 Sheet flow over Short Grass 6.5 225 Total Summary for Subcatchment 4S: EAST AND REAR OF SITE Runoff = 3.34 cfs @ 11.96 hrs, Volume= 0.153 af, Depth= 1.52" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Type II 24-hr 100-YEAR Rainfall=6.00" Area (sf) CN Description 14,429 98 PAVEMENT 38.271 39 >75% Grass cover, Good, HSG A 52,700 55 Weighted Average 38,271 72.62% Pervious Area 14,429 27.38% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (f/ft)(ft/sec) (cfs) 0.9 50 0.0160 0.95 Sheet Flow,ACROSS PAVEMENT TO SWALE Smooth surfaces n= 0.011 P2= 2.40" 3.1 100 0.0130 0.54 1.09 Channel Flow, SWALE TO BASIN Area= 2.0 sf Perim= 6.0' r= 0.33' n= 0.150 Sheet flow over Short Grass 4.0 150 Total Summary for Reach 12R: SWALE Inflow Area = 1.210 ac, 27.38% Impervious, Inflow Depth = 1.52" for 100-YEAR event Inflow = 3.34 cfs @ 11.96 hrs, Volume= 0.153 of Outflow = 2.35 cfs @ 12.12 hrs, Volume= 0.153 af, Atten= 30%, Lag= 9.9 min Routing by Stor-Ind+Trans method, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Max. Velocity= 0.57 fps, Min. Travel Time= 6.5 min Avg. Velocity= 0.14 fps, Avg. Travel Time= 27.0 min 47609-SKY-ZONE-ADD PARKING Type 11 24-hr 100-YEAR Rainfall=6.00" Prepared by{enter your company name here} Printed 1/8/2018 H droCAD@ 9.10 s/n 03732 ©2010 H draCAD Software Solutions LLC Page 5 Peak Storage= 933 cf @ 12.01 hrs Average Depth at Peak Storage= 1.04' Bank-Full Depth= 1.00', Capacity at Bank-Full= 2.23 cfs 2.00' x 1.00' deep channel, n= 0.150 Sheet flow over Short Grass Side Slope Z-value= 2.0 '/' Top Width= 6.00' Length= 220.0' Slope= 0.00607' Inlet Invert= 0.00', Outlet Invert= -1.32' Summary for Pond 1 bP: NORTHEAST INFILTRATION BASIN Inflow Area = 0.067 ac, 35.37% Impervious, Inflow Depth = 1.92" for 100-YEAR event Inflow = 0.26 cfs @ 11.90 hrs, Volume= 0.011 of Outflow = 0.24 cfs @ 11.93 hrs, Volume= 0.011 af, Atten= 9%, Lag= 1.5 min Discarded = 0.24 cfs @ 11.93 hrs, Volume= 0.011 of Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of Routing by Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Peak Elev= 382.47' @ 11.93 hrs Surf.Area= 131 sf Storage= 16 cf Plug-Flow detention time= 0.5 min calculated for 0.011 of(100% of inflow) Center-of-Mass det. time= 0.5 min ( 854.8- 854.3 ) Volume Invert Avail.Stora a Storage Description #1 382.10' 231 cf Custom Stage Data(Conic) Listed below(Recalc) Elevation Surf.Area Inc.Store Cum.Store Wet.Area feet (sq-ft) cubic-feet cubic-feet (sq-ft) 382.10 0 0 0 0 383.00 771 231 231 772 Device Routing Invert Outlet Devices #1 Discarded 382.10' 80.000 in/hr Exfiltration over Wetted area #2 Primary 382.70' 1.2"x 4.8" Horiz. Orifice/Grate X 4.00 columns X 8 rows C= 0.600 Limited to weir flow at low heads discarded OutFlow Max=0.23 cfs @ 11.93 hrs HW=382.46' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.23 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=382.10' (Free Discharge) t2=OrificelGrate ( Controls 0.00 cfs) 47609-SKY-ZONE-ADD PARKING Type 1l 24-hr 100-YEAR Rainfall=6.00" Prepared by{enter your company name here} Printed 1/8/2018 H droCAD®9.10 s/n 03732 ©2010 H droCAD Software Solutions LLC Page 6 Summary for Pond 3P: 8' X 8' DRYWELL Inflow Area = 0.508 ac, 77.51% Impervious, Inflow Depth = 4.05" for 100-YEAR event Inflow = 3.13 cfs @ 11.93 hrs, Volume= 0.171 of Outflow = 2.34 cfs @ 12.01 hrs, Volume= 0.171 af, Atten= 25%, Lag= 4.4 min Discarded = 2.34 cfs @ 12.01 hrs, Volume= 0.171 of Routing by Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Peak Elev= 379.87' @ 12.01 hrs Surf.Area= 505 sf Storage= 835 cf Plug-Flow detention time= (not calculated: outflow precedes inflow) Center-of-Mass det. time= 2.2 min ( 787.9- 785.6 ) Volume Invert Avail.Stora a Storage Description #1 372.20' 702 cf 10.00'D x 9.00'H Vertical Cone/Cylinder Z=1.0 2,743 cf Overall -402 cf Embedded = 2,340 cf x 30.0% Voids #2 373.20' 402 cf 8.00'D x 8.00'H Vertical Cone/Cylinder Inside#1 1,104 cf Total Available Storage Device Routina Invert Outlet Devices #1 Discarded 372.20' 200.000 in/hr Exfiltration over Horizontal area Qiscarded OutFlow Max=2.32 cfs @ 12.01 hrs HW=379.83' (Free Discharge) 1=Exfiltration (Exfiltration Controls 2.32 cfs) Summary for Pond 4P: SOUTHEAST INFILTRATION BASIN Inflow Area = 1.210 ac, 27.38% Impervious, Inflow Depth = 1.52" for 100-YEAR event Inflow = 2.35 cfs @ 12.12 hrs, Volume= 0.153 of Outflow = 2.08 cfs @ 12.17 hrs, Volume= 0.153 af, Atten= 11%, Lag= 2.7 min Discarded = 2.08 cfs @ 12.17 hrs, Volume= 0.153 of Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of Routing by Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Peak Elev= 381.07' @ 12.17 hrs Surf.Area= 1,124 sf Storage= 204 cf Plug-Flow detention time= 0.6 min calculated for 0.153 of(100% of inflow) Center-of-Mass det. time= 0.6 min ( 892.3 - 891.7 ) Volume Invert Avail.Storage Storage Description #1 380.60' 2,406 cf Custom Stage Data (Conic) Listed below(Recalc) Elevation Surf.Area Inc.Store Cum.Store Wet.Area (feet) (sq-ft) cubic-feet cubic-feet (sq-ft) 380.60 0 0 0 0 381.00 988 132 132 988 382.00 3,877 2,274 2,406 3,882 Device Routing Invert Outlet Devices #1 Discarded 380.60' 80.000 in/hr Exfiltration over Wetted area #2 Primary 381.20' 1.5"x 4.0" Horiz. Orifice/Grate X 10 rows C= 0.600 47609-SKY-ZONE-ADD PARKING Type //24-hr 100-YEAR Rainfall=6.00" Prepared by{enter your company name here} Printed 1/8/2018 HydroCAD®9.10 s/n 03732 ©2010 HydroCAD Software Solutions LLC Paae 7 Limited to weir flow at low heads ,]iscarded OutFlow Max=2.06 cfs @ 12.17 hrs HW=381.06' (Free Discharge) 1=Exfiltration (Exfiltration Controls 2.06 cfs) triOutFlow Max=0.00 cfs @ 0.00 hrs HW=380.60' (Free Discharge) 2=Orifice/Grate ( Controls 0.00 cfs) Summary for Pond 5P: 8' X 4' DRYWELL Inflow Area = 1.210 ac, 27.38% Impervious, Inflow Depth = 0.00" for 100-YEAR event Inflow = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of Outflow = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af, Atten= 0%, Lag= 0.0 min Discarded = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of Routing by Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Peak Elev= 374.70' @ 0.00 hrs Surf.Area= 79 sf Storage= 0 cf Plug-Flow detention time= (not calculated: initial storage excedes outflow) Center-of-Mass det. time= (not calculated: no inflow) Volume Invert Avail.Storage Storage Description #1 374.70' 215 cf 10.00'D x 5.00'H Vertical Cone/Cylinder Z=1.0 916 cf Overall - 201 cf Embedded = 715 cf x 30.0% Voids #2 375.70' 201 cf 8.00'D x 4.00'H Vertical Cone/Cylinder Inside#1 416 cf Total Available Storage Device Routing Invert Outlet Devices #1 Discarded 374.70' 200.000 in/hr Exfiltration over Horizontal area jiscarded OutFlow Max=0.00 cfs @ 0.00 hrs HW=374.70' (Free Discharge) 1=Exfiltration (Passes 0.00 cfs of 0.36 cfs potential flow) Summary for Pond 9P: CB2 Inflow Area = 0.159 ac, 85.03% Impervious, Inflow Depth = 4.74" for 100-YEAR event Inflow = 1.39 cfs @ 11.90 hrs, Volume= 0.063 of Outflow = 1.39 cfs @ 11.90 hrs, Volume= 0.063 af, Atten= 0%, Lag= 0.0 min Primary = 1.39 cfs @ 11.90 hrs, Volume= 0.063 of Routing by Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Peak Elev= 380.32' @ 11.90 hrs Device Routing Invert Outlet Devices #1 Primary 379.70' 12.0" Round PIPE L= 60.0' CMP, square edge headwall, Ke= 0.500 Inlet/Outlet Invert= 379.70'/378.55' S= 0.0192 '/' Cc= 0.900 n= 0.010 rimary OutFlow Max=1.38 cfs @ 11.90 hrs HW=380.32' (Free Discharge) 1=PIPE (Inlet Controls 1.38 cfs @ 2.68 fps) 47609-SKY-ZONE-ADD PARKING Type // 24-hr 100-YEAR Rainfall=6.00" Prepared by{enter your company name here} Printed 1/8/2018 H droCAD®9.10 s/n 03732 @2010 H droCAD Software Solutions LLC Page 8 Summary for Pond 10P: C133 Inflow Area = 0.282 ac, 83.30% Impervious, Inflow Depth = 4.63" for 100-YEAR event Inflow = 2.07 cfs @ 11.97 hrs, Volume= 0.109 of Outflow = 2.07 cfs @ 11.97 hrs, Volume= 0.109 af, Atten= 0%, Lag= 0.0 min Primary = 2.07 cfs @ 11.97 hrs, Volume= 0.109 of Routing by Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Peak Elev= 379.77' @ 11.97 hrs Device Routing Invert Outlet Devices #1 Primary 378.90' 12.0" Round PIPE L= 68.0' CMP, square edge headwall, Ke= 0.500 Inlet/Outlet Invert= 378.90'/378.55' S= 0.0051 T Cc= 0.900 n= 0.010 rimary Outflow Max=2.01 cfs @ 11.97 hrs HW=379.76' (Free Discharge) 1=PIPE (Barrel Controls 2.01 cfs @ 3.77 fps)