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042109 Willowdale Revised Vault Calculations.pdf Existing Event Summary: BasinID Peak Q Peak T Peak Vol Area Method Raintype Event ------- (cfs) (hrs) (ac-ft) ac /Loss Existing 0.02 17.00 0.0249 0.95 SBUH/SCS TYPE1A 2 yr Existing 0.06 10.00 0.0690 0.95 SBUH/SCS TYPE1A 10 yr Existing 0.13 9.17 0.1352 0.95 SBUH/SCS TYPE1A 100 yr Drainage Area: Existing Hyd Method: SBUH Hyd Loss Method: SCS CN Number Peak Factor: 484.00 SCS Abs: 0.20 Storm Dur: 24.00 hrs Intv: 10.00 min Area CN TC 0.9500 ac 81.00 2.19 hrs Total 0.9500 ac Supporting Data: Pervious CN Data: 2nd Growth Forested 81.00 0.9500 ac Pervious TC Data: Flow type: Description: Length: Slope: Coeff: Travel Time Sheet None Entered 300.00 ft 0.50% 0.4000 131.51 min Developed Event Summary: BasinID Peak Q Peak T Peak Vol Area Method Raintype Event ------- (cfs) (hrs) (ac-ft) ac /Loss Developed 0.26 8.00 0.0882 0.95 SBUH/SCS TYPE1A 2 yr Developed 0.45 8.00 0.1551 0.95 SBUH/SCS TYPE1A 10 yr Developed 0.70 8.00 0.2391 0.95 SBUH/SCS TYPE1A 100 yr Drainage Area: Developed Hyd Method: SBUH Hyd Loss Method: SCS CN Number Peak Factor: 484.00 SCS Abs: 0.20 Storm Dur: 24.00 hrs Intv: 10.00 min Area CN TC Pervious 0.2000 ac 86.00 0.08 hrs Impervious 0.7500 ac 98.00 0.08 hrs Total 0.9500 ac Supporting Data: Pervious CN Data: Pervious 86.00 0.2000 ac Impervious CN Data: Impervious 98.00 0.7500 ac Pervious TC Data: Flow type: Description: Length: Slope: Coeff: Travel Time Fixed None Entered 0.00 ft 0.00% 5.0000 5.00 min Impervious TC Data: Flow type: Description: Length: Slope: Coeff: Travel Time Fixed None Entered 0.00 ft 0.00% 5.0000 5.00 min Control Structure ID: D-001 - Multiple Orifice Structure Descrip: Multiple Orifice Start El Max El Increment 433.8000 ft 438.0000 ft 0.10 Orif Coeff: 0.62 Bottom El: 431.80 ft Lowest Diam: 0.4688 in out to 2nd: 2.5300 ft Diam: 1.4648 in 2nd to 3rd: 0.6200 ft Diam: 1.6992 in Node ID: Design Vault Desc: Manhole structure Start El: 433.8000 ft Max El: 438.0000 ft Contrib Basin: Contrib Hyd: Stage Area Volume Volume 433.80 1310.00 0.00 cf 0.0000 acft 438.00 1310.00 5503.31 cf 0.1263 acft Node ID: LP Node Desc: Manhole structure Start El: 433.8000 ft Max El: 438.0000 ft Contrib Basin: Contrib Hyd: Storage Id: Design Vault Discharge Id: D-001 RLPCOMPUTE \[LP Node\] SUMMARY 2 yr Match Q: 0.0091 cfs Peak Out Q: 0.0095 cfs - Peak Stg: 436.32 ft - Active Vol: 3304.68 cf 10 yr Match Q: 0.0569 cfs Peak Out Q: 0.0562 cfs - Peak Stg: 436.94 ft - Active Vol: 4117.57 cf 100 yr Match Q: 0.1288 cfs Peak Out Q: 0.1286 cfs - Peak Stg: 437.45 ft - Active Vol: 0.1098 acft Hydrograph ID: out2 Area: 0.9500 ac Hyd Int: 10.00 min Base Flow: Peak Flow: 0.0095 cfs Peak Time: 24.17 hrs Hyd Vol: 0.0124 acft Hydrograph ID: out10 Area: 0.9500 ac Hyd Int: 10.00 min Base Flow: Peak Flow: 0.0562 cfs Peak Time: 18.67 hrs Hyd Vol: 0.0783 acft Hydrograph ID: out100 Area: 0.9500 ac Hyd Int: 10.00 min Base Flow: Peak Flow: 0.1286 cfs Peak Time: 11.83 hrs Hyd Vol: 0.1611 acft