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HomeMy WebLinkAboutWPO202100063 Stormwater Management Maintenance Agree. 2021-12-06 (4)1S (4S DA-P st DA-Pre A SWM#4-Runoff Reduction Facility Subcat Reach on Link Routing Diagram for Dunlora WPO-SWM4 Prepared by HP Inc., Printed 12/6/2021 HydroCAD® 10.10-6a s/n 08126 © 2020 HydroCAD Software Solutions LLC Dunlora WPO-SWM4 Prepared by HP Inc. Project Notes Defined 10 rainfall events from Albemarle Rainfall OF Printed 12/6/2021 Dunlora WPO-SWM4 Prepared by HP Inc. Rainfall Events Listing (selected events) Event# Event Storm Type Curve Mode Duration B/B Depth AMC Name (hours) (inches) 1 1-yr Type II 24-hr Default 24.00 1 2.97 2 2 2-yr Type II 24-hr Default 24.00 1 3.59 2 3 10-yr Type II 24-hr Default 24.00 1 5.43 2 4 25-yr Type II 24-hr Default 24.00 1 6.67 2 5 100-yr Type II 24-hr Default 24.00 1 8.90 2 Printed 12/6/2021 Dunlora WPO-SWM4 Prepared by HP Inc. Area Listing (all nodes) Area CN Description (acres) (subcatchment-numbers) 4.660 75 (1S) 0.960 78 (1S) 6.960 61 (4S) 12.580 67 TOTAL AREA Printed 12/6/2021 Dunlora WPO-SWM4 Prepared by HP Inc. Area Soil Soil Listing (all nodes) Subcatchment (acres) Group Numbers 0.000 HSG A 0.000 HSG B 0.000 HSG C 0.000 HSG D 12.580 Other 1S, 4S 12.580 TOTAL AREA Printed 12/6/2021 Dunlora WPO-SWM4 Prepared by HP Inc. Ground Covers (all nodes) Printed 12/6/2021 HSG-A HSG-B HSG-C HSG-D Other Total Ground Subcatchment (acres) (acres) (acres) (acres) (acres) (acres) Cover Numbers 0.000 0.000 0.000 0.000 12.580 12.580 1 S, 4S 0.000 0.000 0.000 0.000 12.580 12.580 TOTAL AREA Dunlora WPO-SWM4 Prepared by HP Inc. Pipe Listing (all nodes) Printed 12/6/2021 Line# Node In -Invert Out -Invert Length Slope n Width Diam/Height Inside -Fill Number (feet) (feet) (feet) (ft/ft) (inches) (inches) (inches) 1 5P 362.00 361.75 50.0 0.0050 0.020 0.0 24.0 0.0 Dunlora WPO-SWM4 Type 1124-hr 1-yrRainfall=2.97" Prepared by HP Inc. Printed 12/6/2021 HvdroCADO 10.10-6a s/n 08126 © 2020 HvdroCAD Software Solutions LLC Paae 8 Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind method - Pond routing by Stor-Ind method Subcatchment 1S: DA-Post Runoff Area=5.620 ac 0.00% Impervious Runoff Depth>0.90" Tc=8.0 min CN=76 Runoff=9.02 cfs 0.421 of Subcatchment 4S: DA-Pre Runoff Area=6.960 ac 0.00% Impervious Runoff Depth>0.30" Tc=10.5 min CN=61 Runoff=2.42 cfs 0.174 of Pond 5P: SWM#4-Runoff Reduction Facility Peak Elev=364.58' Storage=6,160 cf Inflow=9.02 cfs 0.421 of Outflow=2.02 cfs 0.411 of Total Runoff Area = 12.580 ac Runoff Volume = 0.595 of Average Runoff Depth = 0.57" 100.00% Pervious = 12.580 ac 0.00% Impervious = 0.000 ac Dunlora WPO-SWM4 Prepared by HP Inc. Type 1124-hr 1-yrRainfall=2.97" Printed 12/6/2021 Summary for Subcatchment 1 S: DA-Post Runoff = 9.02 cfs @ 12.00 hrs, Volume= 0.421 af, Depth> 0.90" Routed to Pond 5P : SWM#4-Runoff Reduction Facility 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=2.97" Area (ac) CN Description 4.660 75 5.620 76 Weighted Average 5.620 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 8.0 Direct Entry, Subcatchment 1S: DA-Post Hydrograph 0 LL ■■■■■■ ■■■■■■, 1 see, ® i m • 1 ■■■■■■, ■■■ME112H ■■■■■■, ■■■■■■■■ 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ❑ RunoH Dunlora WPO-SWM4 Prepared by HP Inc. Type 1124-hr 1-yrRainfall=2.97" Printed 12/6/2021 Summary for Subcatchment 4S: DA-Pre Runoff = 2.42 cfs @ 12.06 hrs, Volume= 0.174 af, Depth> 0.30" 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=2.97" Area (ac) CN Description 1.180 61 1.540 61 6.960 61 Weighted Average 6.960 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 10.5 Direct Entry, Subcatchment 4S: DA-Pre Hydrograph ',. ❑Runoff 2 a2 cfs Type II 24-hr 1-yr Rainfall=2.97" 2 Run fre 660 c Ru lu4f R D hno10OTc=10.5 min CN=I61 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (houm) Dunlora WPO-SWM4 Prepared by HP Inc. Type 1124-hr 1-yrRainfall=2.97" Printed 12/6/2021 Summary for Pond 5P: SWM#4-Runoff Reduction Facility Top of Berm 370.67 Inflow Area = 5.620 ac, 0.00% Impervious, Inflow Depth > 0.90" for 1-yr event Inflow = 9.02 cfs @ 12.00 hrs, Volume= 0.421 of Outflow = 2.02 cfs @ 12.21 hrs, Volume= 0.411 af, Atten= 78%, Lag= 12.8 min Primary = 2.02 cfs @ 12.21 hrs, Volume= 0.411 of Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 364.58' @ 12.21 hrs Surf.Area= 3,004 sf Storage= 6,160 cf Plug -Flow detention time= 36.9 min calculated for 0.410 of (97% of inflow) Center -of -Mass det. time= 28.5 min ( 837.2 - 808.7 ) Volume Invert Avail.Storage Storage Description #1 362.00' 30,413 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic -feet) (cubic -feet) 362.00 1,789 0 0 364.00 2,707 4,496 4,496 366.00 3,726 6,433 10,929 368.00 4,846 8,572 19,501 370.00 6,066 10,912 30,413 Device Routing Invert Outlet Devices #1 Primary 362.00' 24.0" Round Culvert L= 50.0' Box, 00 wingwalls, square crown edge, Ke= 0.700 Inlet / Outlet Invert= 362.00' / 361.75' S= 0.0050 '/' Cc= 0.900 n= 0.020, Flow Area= 3.14 sf #2 Device 1 362.00' 5.0" Vert. Orifice/Grate X 2.00 C= 0.600 Limited to weir flow at low heads #3 Device 1 365.00' 15.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #4 Device 1 367.80' 48.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=2.02 cfs @ 12.21 hrs HW=364.58' (Free Discharge) t1=Culvert (Passes 2.02 cfs of 13.70 cfs potential flow) 2=Orifice/Grate (Orifice Controls 2.02 cfs @ 7.41 fps) 3=Orifice/Grate ( Controls 0.00 cfs) =Orifice/Grate ( Controls 0.00 cfs) Dunlora WPO-SWM4 Prepared by HP Inc. Type 1124-hr 1-yrRainfall=2.97" Printed 12/6/2021 Pond 5P: SWM#4-Runoff Reduction Facility Hydrograph Time (hours) ■ Inflow ■ Primary Dunlora WPO-SWM4 Type 1124-hr 2-yr Raintall=3.59 " Prepared by HP Inc. Printed 12/6/2021 HvdroCADO 10.10-6a s/n 08126 © 2020 HvdroCAD Software Solutions LLC Paoe 13 Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind method - Pond routing by Stor-Ind method Subcatchment 1S: DA-Post Runoff Area=5.620 ac 0.00% Impervious Runoff Depth>1.30" Tc=8.0 min CN=76 Runoff=13.14 cfs 0.610 of Subcatchment 4S: DA-Pre Runoff Area=6.960 ac 0.00% Impervious Runoff Depth>0.53" Tc=10.5 min CN=61 Runoff=5.23 cfs 0.309 of Pond 5P: SWM#4-Runoff Reduction Facility Peak Elev=365.56' Storage=9,344 cf Inflow=13.14 cfs 0.610 of Outflow=3.77 cfs 0.599 of Total Runoff Area = 12.580 ac Runoff Volume = 0.919 of Average Runoff Depth = 0.88" 100.00% Pervious = 12.580 ac 0.00% Impervious = 0.000 ac Dunlora WPO-SWM4 Prepared by HP Inc. Type 1124-hr 2-yrRainfall=3.59" Printed 12/6/2021 Summary for Subcatchment 1 S: DA-Post Runoff = 13.14 cfs @ 12.00 hrs, Volume= 0.610 af, Depth> 1.30" Routed to Pond 5P : SWM#4-Runoff Reduction Facility 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=3.59" Area (ac) CN Description 4.660 75 5.620 76 Weighted Average 5.620 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 8.0 Direct Entry, Subcatchment 1S: DA-Post Hydrograph 11- 0 LL '------MM------- MMMMMMr' ������■ ����'IiiiWiii�Y�ii'i`i ������■ �Si-ii:Lliyiiii��37S�`li� rr� 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ■ Rurwff Dunlora WPO-SWM4 Prepared by HP Inc. Type 1124-hr 2-yr Rainfall=3.59 " Printed 12/6/2021 Summary for Subcatchment 4S: DA-Pre Runoff = 5.23 cfs @ 12.05 hrs, Volume= 0.309 af, Depth> 0.53" 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=3.59" Area (ac) CN Description 1.180 61 1.540 61 6.960 61 Weighted Average 6.960 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 10.5 Direct Entry, Subcatchment 4S: DA-Pre Hydrograph ❑ RunoH 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (houm) Dunlora WPO-SWM4 Prepared by HP Inc. Type 1124-hr 2-yrRainfall=3.59" Printed 12/6/2021 Summary for Pond 5P: SWM#4-Runoff Reduction Facility Top of Berm 370.67 Inflow Area = 5.620 ac, 0.00% Impervious, Inflow Depth > 1.30" for 2-yr event Inflow = 13.14 cfs @ 12.00 hrs, Volume= 0.610 of Outflow = 3.77 cfs @ 12.17 hrs, Volume= 0.599 af, Atten= 71%, Lag= 10.3 min Primary = 3.77 cfs @ 12.17 hrs, Volume= 0.599 of Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 365.56' @ 12.17 hrs Surf.Area= 3,503 sf Storage= 9,344 cf Plug -Flow detention time= 39.8 min calculated for 0.599 of (98% of inflow) Center -of -Mass det. time= 33.1 min ( 833.9 - 800.9 ) Volume Invert Avail.Storage Storage Description #1 362.00' 30,413 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic -feet) (cubic -feet) 362.00 1,789 0 0 364.00 2,707 4,496 4,496 366.00 3,726 6,433 10,929 368.00 4,846 8,572 19,501 370.00 6,066 10,912 30,413 Device Routing Invert Outlet Devices #1 Primary 362.00' 24.0" Round Culvert L= 50.0' Box, 00 wingwalls, square crown edge, Ke= 0.700 Inlet / Outlet Invert= 362.00' / 361.75' S= 0.0050 '/' Cc= 0.900 n= 0.020, Flow Area= 3.14 sf #2 Device 1 362.00' 5.0" Vert. Orifice/Grate X 2.00 C= 0.600 Limited to weir flow at low heads #3 Device 1 365.00' 15.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #4 Device 1 367.80' 48.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=3.70 cfs @ 12.17 hrs HW=365.55' (Free Discharge) t1=Culvert (Passes 3.70 cfs of 18.97 cfs potential flow) 2=Orifice/Grate (Orifice Controls 2.40 cfs @ 8.80 fps) 3=Orifice/Grate (Orifice Controls 1.31 cfs @ 2.52 fps) =Orifice/Grate ( Controls 0.00 cfs) Dunlora WPO-SWM4 Prepared by HP Inc. Type 1124-hr 2-yr Rainfall=3.59" Printed 12/6/2021 Pond 5P: SWM#4-Runoff Reduction Facility Hydrograph mmm -- EMEME MEN ---- ------O, m M!"07 ------■ -mmok-WWWWAS ------■ -m"—U—=��=m --- ---. SOMM �:iN, i��: m"m MEN -------- ----- -------- ----- ------- ■ U fim— ■ Primary Dunlora WPO-SWM4 Type // 24-hr 10-yr Rainfall=5.43" Prepared by HP Inc. Printed 12/6/2021 HvdroCADO 10.10-6a s/n 08126 © 2020 HvdroCAD Software Solutions LLC Paoe 18 Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind method - Pond routing by Stor-Ind method Subcatchment 1S: DA-Post Runoff Area=5.620 ac 0.00% Impervious Runoff Depth>2.67" Tc=8.0 min CN=76 Runoff=26.54 cfs 1.250 of Subcatchment 4S: DA-Pre Runoff Area=6.960 ac 0.00% Impervious Runoff Depth>1.47" Tc=10.5 min CN=61 Runoff=16.35 cfs 0.850 of Pond 5P: SWM#4-Runoff Reduction Peak Elev=367.55' Storage=17,390 cf Inflow=26.54 cfs 1.250 of Outflow=11.24 cfs 1.236 of Total Runoff Area = 12.580 ac Runoff Volume = 2.101 of Average Runoff Depth = 2.00" 100.00% Pervious = 12.580 ac 0.00% Impervious = 0.000 ac Dunlora WPO-SWM4 Prepared by HP Inc. Type/1 24-hr 10-yr Rainfall=5.43" Printed 12/6/2021 Summary for Subcatchment 1 S: DA-Post Runoff = 26.54 cfs @ 11.99 hrs, Volume= 1.250 af, Depth> 2.67" Routed to Pond 5P : SWM#4-Runoff Reduction Facility 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=5.43" Area (ac) CN Description 4.660 75 5.620 76 Weighted Average 5.620 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 8.0 Direct Entry, Subcatchment 1S: DA-Post Hydrograph ' --- MM�MMM- E:::: ---- � ------- =UMMMM 5 6 7 8 9 10 . .,_ ,,2 13 Time (hours) 14 15 16 17 18 19 20 ❑ RunoH Dunlora WPO-SWM4 Prepared by HP Inc. Type/1 24-hr 10-yr Rainfall=5.43" Printed 12/6/2021 Summary for Subcatchment 4S: DA-Pre Runoff = 16.35 cfs @ 12.03 hrs, Volume= 0.850 af, Depth> 1.47" 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=5.43" Area (ac) CN Description 1.180 61 1.540 61 6.960 61 Weighted Average 6.960 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 10.5 Direct Entry, Subcatchment 4S: DA-Pre Hydrograph 00 5 6 7 8 9 10 11, .1,2 1,3 1,4. 15 . . 16 17 18 19 20 Time (hours) ■ Rurwff Dunlora WPO-SWM4 Prepared by HP Inc. Type/1 24-hr 10-yr Rainfall=5.43" Printed 12/6/2021 Summary for Pond 5P: SWM#4-Runoff Reduction Facility Top of Berm 370.67 Inflow Area = 5.620 ac, 0.00% Impervious, Inflow Depth > 2.67" for 10-yr event Inflow = 26.54 cfs @ 11.99 hrs, Volume= 1.250 of Outflow = 11.24 cfs @ 12.12 hrs, Volume= 1.236 af, Atten= 58%, Lag= 7.6 min Primary = 11.24 cfs @ 12.12 hrs, Volume= 1.236 of Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 367.55' @ 12.12 hrs Surf.Area= 4,596 sf Storage= 17,390 cf Plug -Flow detention time= 33.4 min calculated for 1.232 of (99% of inflow) Center -of -Mass det. time= 28.8 min ( 814.6 - 785.7 ) Volume Invert Avail.Storage Storage Description #1 362.00' 30,413 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic -feet) (cubic -feet) 362.00 1,789 0 0 364.00 2,707 4,496 4,496 366.00 3,726 6,433 10,929 368.00 4,846 8,572 19,501 370.00 6,066 10,912 30,413 Device Routing Invert Outlet Devices #1 Primary 362.00' 24.0" Round Culvert L= 50.0' Box, 00 wingwalls, square crown edge, Ke= 0.700 Inlet / Outlet Invert= 362.00' / 361.75' S= 0.0050 '/' Cc= 0.900 n= 0.020, Flow Area= 3.14 sf #2 Device 1 362.00' 5.0" Vert. Orifice/Grate X 2.00 C= 0.600 Limited to weir flow at low heads #3 Device 1 365.00' 15.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #4 Device 1 367.80' 48.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=11.16 cfs @ 12.12 hrs HW=367.52' (Free Discharge) t1=Culvert (Passes 11.16 cfs of 27.47 cfs potential flow) 2=Orifice/Grate (Orifice Controls 3.03 cfs @ 11.10 fps) 3=Orifice/Grate (Orifice Controls 8.13 cfs @ 6.63 fps) =Orifice/Grate ( Controls 0.00 cfs) Dunlora WPO-SWM4 Prepared by HP Inc. Type Il 24-hr 10-yr Rainfall=5.43" Printed 12/6/2021 Pond 5P: SWM#4-Runoff Reduction Facility Hydrograph Time (houm) ■ Inflow ■ Primary Dunlora WPO-SWM4 Type 1124-hr 25-yrRainfall=6.67" Prepared by HP Inc. Printed 12/6/2021 HvdroCADO 10.10-6a s/n 08126 © 2020 HvdroCAD Software Solutions LLC Paoe 23 Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind method - Pond routing by Stor-Ind method Subcatchment 1S: DA-Post Runoff Area=5.620 ac 0.00% Impervious Runoff Depth>3.68" Tc=8.0 min CN=76 Runoff=36.06 cfs 1.722 of Subcatchment 4S: DA-Pre Runoff Area=6.960 ac 0.00% Impervious Runoff Depth>2.23" Tc=10.5 min CN=61 Runoff=25.27 cfs 1.296 of Pond 5P: SWM#4-Runoff Reduction Peak Elev=368.33' Storage=21,127 cf Inflow=36.06 cfs 1.722 of Outflow=28.08 cfs 1.706 of Total Runoff Area = 12.580 ac Runoff Volume = 3.018 of Average Runoff Depth = 2.88" 100.00% Pervious = 12.580 ac 0.00% Impervious = 0.000 ac Dunlora WPO-SWM4 Prepared by HP Inc. Type 11 24-hr 25-yr Rainfall=6.67" Printed 12/6/2021 Summary for Subcatchment 1 S: DA-Post Runoff = 36.06 cfs @ 11.99 hrs, Volume= 1.722 af, Depth> 3.68" Routed to Pond 5P : SWM#4-Runoff Reduction Facility 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 25-yr Rainfall=6.67" Area (ac) CN Description 4.660 75 5.620 76 Weighted Average 5.620 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 8.0 Direct Entry, Subcatchment 1S: DA-Post Hydrograph 3 LL MMM ______■ __ i�\ r l l 1.1 1 �':��A�4��� �wwwww■ ��■ww■ww�w■■ �wwwww■ �u�,u,��uu��errs��a �wwwww■ �w■���:�!��rr.� �wwwww■ �w■a�:r�a���r•� M_w_w_w_w_w_■ Mw_w_w_i_MM. FYTN"IM ______■ _________MI! \ UE 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ■ Rurwff Dunlora WPO-SWM4 Prepared by HP Inc. Type 11 24-hr 25-yr Rainfall=6.67" Printed 12/6/2021 Summary for Subcatchment 4S: DA-Pre Runoff = 25.27 cfs @ 12.03 hrs, Volume= 1.296 af, Depth> 2.23" 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 25-yr Rainfall=6.67" Area (ac) CN Description ' 1.180 61 ' 1.540 61 : � n•n r_n 6.960 61 Weighted Average 6.960 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 10.5 Direct Entry, Subcatchment 4S: DA-Pre Hydrograph 0 LL ' M---- .....-MM...MwMM Id 5 8 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ■ Rurwff Dunlora WPO-SWM4 Prepared by HP Inc. Type 11 24-hr 25-yr Rainfall=6.67" Printed 12/6/2021 Summary for Pond 5P: SWM#4-Runoff Reduction Facility Top of Berm 370.67 Inflow Area = 5.620 ac, 0.00% Impervious, Inflow Depth > 3.68" for 25-yr event Inflow = 36.06 cfs @ 11.99 hrs, Volume= 1.722 of Outflow = 28.08 cfs @ 12.07 hrs, Volume= 1.706 af, Atten= 22%, Lag= 4.4 min Primary = 28.08 cfs @ 12.07 hrs, Volume= 1.706 of Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 368.33' @ 12.07 hrs Surf.Area= 5,047 sf Storage= 21,127 cf Plug -Flow detention time= 30.7 min calculated for 1.700 of (99% of inflow) Center -of -Mass det. time= 26.9 min ( 805.6 - 778.7 ) Volume Invert Avail.Storage Storage Description #1 362.00' 30,413 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic -feet) (cubic -feet) 362.00 1,789 0 0 364.00 2,707 4,496 4,496 366.00 3,726 6,433 10,929 368.00 4,846 8,572 19,501 370.00 6,066 10,912 30,413 Device Routing Invert Outlet Devices #1 Primary 362.00' 24.0" Round Culvert L= 50.0' Box, 00 wingwalls, square crown edge, Ke= 0.700 Inlet / Outlet Invert= 362.00' / 361.75' S= 0.0050 '/' Cc= 0.900 n= 0.020, Flow Area= 3.14 sf #2 Device 1 362.00' 5.0" Vert. Orifice/Grate X 2.00 C= 0.600 Limited to weir flow at low heads #3 Device 1 365.00' 15.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #4 Device 1 367.80' 48.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=26.01 cfs @ 12.07 hrs HW=368.27' (Free Discharge) tl=culvert (Passes 26.01 cfs of 30.08 cfs potential flow) 2=Orifice/Grate (Orifice Controls 3.23 cfs @ 11.85 fps) 3=Orifice/Grate (Orifice Controls 9.61 cfs @ 7.83 fps) =Orifice/Grate (Weir Controls 13.17 cfs @ 2.24 fps) Dunlora WPO-SWM4 Prepared by HP Inc. Type 1124-hr 25-yr Rainfall=6.67" Printed 12/6/2021 Pond 5P: SWM#4-Runoff Reduction Facility Hydrograph Time (houm) ■ Inflow ■ Primary Dunlora WPO-SWM4 Type 1124-hr 100-yrRainfall=8.90" Prepared by HP Inc. Printed 12/6/2021 HvdroCADO 10.10-6a s/n 08126 © 2020 HvdroCAD Software Solutions LLC Paoe 28 Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind method - Pond routing by Stor-Ind method Subcatchment 1S: DA-Post Runoff Area=5.620 ac 0.00% Impervious Runoff Depth>5.58" Tc=8.0 min CN=76 Runoff=53.51 cfs 2.613 of Subcatchment 4S: DA-Pre Runoff Area=6.960 ac 0.00% Impervious Runoff Depth>3.80" Tc=10.5 min CN=61 Runoff=42.86 cfs 2.202 of Pond 5P: SWM#4-Runoff Reduction Peak Elev=369.54' Storage=27,693 cf Inflow=53.51 cfs 2.613 of Outflow=34.05 cfs 2.593 of Total Runoff Area = 12.580 ac Runoff Volume = 4.815 of Average Runoff Depth = 4.59" 100.00% Pervious = 12.580 ac 0.00% Impervious = 0.000 ac Dunlora WPO-SWM4 Prepared by HP Inc. Type 1124-hr 100-yr Rainfall=8.90" Printed 12/6/2021 Summary for Subcatchment 1 S: DA-Post Runoff = 53.51 cfs @ 11.99 hrs, Volume= 2.613 af, Depth> 5.58" Routed to Pond 5P : SWM#4-Runoff Reduction Facility 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=8.90" Area (ac) CN Description 4.660 75 5.620 76 Weighted Average 5.620 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 8.0 Direct Entry, Subcatchment 1S: DA-Post Hydrograph 0 LL FAF .-----. MM"MI NIOMPO" .-----. .MM0600"ORM ■....-, ■M0"OHNIN ■....-, .-----, .LIMO."Paw MMMMOM N ■....-, ■.-..MMU ■MMMMM 1 ..-...-. 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ■ Rurwff Dunlora WPO-SWM4 Prepared by HP Inc. Type 1124-hr 100-yr Rainfall=8.90" Printed 12/6/2021 Summary for Subcatchment 4S: DA-Pre Runoff = 42.86 cfs @ 12.02 hrs, Volume= 2.202 af, Depth> 3.80" 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=8.90" Area (ac) CN Description ' 1.180 61 ' 1.540 61 6.960 61 Weighted Average 6.960 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 10.5 Direct Entry, Subcatchment 4S: DA-Pre Hydrograph --- ------- 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ■ Rurwff Dunlora WPO-SWM4 Prepared by HP Inc. Type 1124-hr 100-yr Rainfall=8.90" Printed 12/6/2021 Summary for Pond 5P: SWM#4-Runoff Reduction Facility Top of Berm 370.67 Inflow Area = 5.620 ac, 0.00% Impervious, Inflow Depth > 5.58" for 100-yr event Inflow = 53.51 cfs @ 11.99 hrs, Volume= 2.613 of Outflow = 34.05 cfs @ 12.08 hrs, Volume= 2.593 af, Atten= 36%, Lag= 5.1 min Primary = 34.05 cfs @ 12.08 hrs, Volume= 2.593 of Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 369.54' @ 12.08 hrs Surf.Area= 5,786 sf Storage= 27,693 cf Plug -Flow detention time= 28.0 min calculated for 2.593 of (99% of inflow) Center -of -Mass det. time= 24.8 min ( 794.0 - 769.3 ) Volume Invert Avail.Storage Storage Description #1 362.00' 30,413 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic -feet) (cubic -feet) 362.00 1,789 0 0 364.00 2,707 4,496 4,496 366.00 3,726 6,433 10,929 368.00 4,846 8,572 19,501 370.00 6,066 10,912 30,413 Device Routing Invert Outlet Devices #1 Primary 362.00' 24.0" Round Culvert L= 50.0' Box, 00 wingwalls, square crown edge, Ke= 0.700 Inlet / Outlet Invert= 362.00' / 361.75' S= 0.0050 '/' Cc= 0.900 n= 0.020, Flow Area= 3.14 sf #2 Device 1 362.00' 5.0" Vert. Orifice/Grate X 2.00 C= 0.600 Limited to weir flow at low heads #3 Device 1 365.00' 15.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #4 Device 1 367.80' 48.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=33.90 cfs @ 12.08 hrs HW=369.49' (Free Discharge) tl=culvert (Barrel Controls 33.90 cfs @ 10.79 fps) 2=Orifice/Grate (Passes < 3.54 cfs potential flow) 3=Orifice/Grate (Passes < 11.62 cfs potential flow) =Orifice/Grate (Passes < 78.64 cfs potential flow) Dunlora WPO-SWM4 Prepared by HP Inc. 5 0 5 Type II 24-hr 100-yr Rainfall=8.90" Printed 12/6/2021 Pond 5P: SWM#4-Runoff Reduction Facility Hydrograph MMM ei • . • ...... CCU..... � ....... Ei�//////////////////////////////•//��'//'//'////////////'/////////�////� 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (houm) .Infim ■ Primary