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11 Goldfmch Brothers Drainage Study 1 June 26,2008 7/8/08 10:20:37 am J.C. McDonnell & Associates page 2 Goldfinch Brothers II Vault Drainage-Two Orifice Config 07/08/26/2008 IIBASIN SUMMARY BASIN ID: B100 NAME: 100-year undeveloped II SBUH METHODOLOGY TOTAL AREA • 1.20 Acres BASEFLOWS: 0.00 cfs RAINFALL TYPE ▪ TYPE1A PERV IMP PRECIPITATION • 3.25 inches AREA. . : 1.20 Acres 0.00 Acres I TIME INTERVAL 10.00 min CN • 81.00 0.00 TC 91.59 min 0.00 min ABSTRACTION COEFF: 0.20 TcReach - Sheet L: 300.00 ns:0.4000 p2yr: 1.55 s:0.0125 11 TcReach - Shallow L: 25.00 ks:8.00 s:0.0125 TcReach - Channel L: 231.00 kc:20.00 s:0.0175 PEAK RATE: 0.16 cfs VOL: 0.15 Ac-ft TIME: 540 min BASIN ID: D00.5 NAME: 6-month undeveloped SBUH METHODOLOGY TOTAL AREA • 1.20 Acres BASEFLOWS: 0.00 cfs RAINFALL TYPE TYPE1A PERV IMP PRECIPITATION • 0.99 inches AREA. . : 0.11 Acres 1.09 Acres II TIME INTERVAL 10.00 min CN • 86.00 98.00 TC • 10.00 min 10.00 min ABSTRACTION COEFF: 0.20 11 PEAK RATE: 0.19 cfs VOL: 0.07 Ac-ft TIME: 480 min BASIN ID: D002 NAME: 2-year developed SBUH METHODOLOGY II TOTAL AREA • 1.20 Acres BASEFLOWS: 0.00 cfs RAINFALL TYPE TYPE1A PERV IMP PRECIPITATION ▪ 1.55 inches AREA. . : 0.11 Acres 1.09 Acres TIME INTERVAL 10.00 min CN • 86.00 98.00 TC • 10.00 min 10.00 min il ABSTRACTION COEFF: 0.20 PEAK RATE: 0.33 cfs VOL: 0.13 Ac-ft TIME: 480 min II BASIN ID: D010 NAME: 10-year developed SBUH METHODOLOGY TOTAL AREA • 1.20 Acres BASEFLOWS: 0.00 cfs RAINFALL TYPE TYPE1A PERV IMP II PRECIPITATION • 2.25 inches AREA. . : 0.11 Acres 1.09 Acres TIME INTERVAL 10.00 min CN 86.00 98.00 TC 10.00 min 10.00 min ABSTRACTION COEFF: 0.20 IIPEAK RATE: 0.51 cfs VOL: 0.19 Ac-ft TIME: 480 min I 11 II II 19