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12/9/02 4:11:24 pm Perteet Engineering, Inc page 6 <br /> Silver Lake Elementary <br /> Preliminary Drainage Design <br /> BASIN SUMMARY <br /> BASIN ID: sdev-002 NAME: Swapped parking area 2yr <br /> SBUH METHODOLOGY <br /> TOTAL AREA • 0.21 Acres BASEFLOWS: 0.00 cfs <br /> RAINFALL TYPE TYPE1A PERV IMP <br /> PRECIPITATION • 1.70 inches AREA..: 0.00 Acres 0.21 Acres <br /> TIME INTERVAL 10.00 min CN 0.00 98.00 <br /> TC 0.00 min 5.00 min <br /> ABSTRACTION COEFF: 0.20 <br /> PEAK RATE: 0.07 cfs VOL: 0.03 Ac-ft TIME: 480 min <br /> BASIN ID: sdev-010 NAME: Swapped parking area 10 yr <br /> SBUH METHODOLOGY <br /> TOTAL AREA • 0.21 Acres BASEFLOWS: 0.00 cfs <br /> RAINFALL TYPE TYPE1A PERV IMP <br /> PRECIPITATION • 2.30 inches AREA. . : 0.00 Acres 0.21 Acres <br /> TIME INTERVAL 10.00 min CN 0.00 98.00 <br /> TC 0.00 min 5.00 min <br /> ABSTRACTION COEFF: 0.20 <br /> PEAK RATE: 0.10 cfs VOL: 0.04 Ac-ft TIME: 480 min <br /> BASIN ID: sdev-100 NAME: Swapped parking area 100 yr <br /> SBUH METHODOLOGY <br /> TOTAL AREA • 0.21 Acres BASEFLOWS: 0.00 Cfs <br /> RAINFALL TYPE TYPE1A PERV IMP <br /> PRECIPITATION • 3.20 inches AREA. . : 0.00 Acres 0.21 Acres <br /> TIME INTERVAL 10.00 min CN 0.00 98.00 <br /> TC 0.00 min 5.00 min <br /> ABSTRACTION COEFF: 0.20 <br /> PEAK RATE: 0.14 cfs VOL: 0.05 Ac-ft TIME: 480 min <br /> BASIN ID: sdev-6mo NAME: Swapped parking area 6mo <br /> SBUH METHODOLOGY <br /> TOTAL AREA • 0.21 Acres BASEFLOWS: 0.00 cfs <br /> RAINFALL TYPE TYPE1A PERV IMP <br /> PRECIPITATION • 1.10 inches AREA. . : 0.00 Acres 0.21 Acres <br /> TIME INTERVAL 10.00 min CN 0.00 98.00 <br /> TC 0.00 min 5.00 min <br /> ABSTRACTION COEFF: 0.20 <br /> PEAK RATE: 0.04 cfs VOL: 0.02 Ac-ft TIME: 480 min <br />