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12/9/02 4:11: 24 pm Pertect Engineering. Inc page 6 <br />Silver Lake Elementary <br />Preliminary ➢rainage 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 CIS <br />RAINFALL TYPE....: TYPEIA 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: 0.01 AC-ft TIME: 480 min <br />BASIN ID: Sdev-010 NAME: Swapped parking area 10 yr <br />SSW METHODOLOGY <br />TOTAL AREA.......: 0.21 Acres BASEFLOWS: 0.00 cfs <br />RAINFALL TYPE....: TYPElA PERV IMP <br />PRECIPITATION....: 2.70 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: . 0.10 cfs VOL: 0.04 Ac-ft TIME: 400 min <br />BASIN ID: sdev-100 NAME: Swapped parking area 100 yr <br />SOUII METHODOLOGY <br />TOTAL AREA.......: 0.21 Acres BASEFLOWS: 0.00 CIS <br />RAINFALL TYPE....: TYPEIA PERV IMP <br />PRECIPITATION....: 0.20 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: 400 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....: TYPElA 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 -It SINE: 480 min <br />