12815 19TH AVE SE 2018-01-30 - Laserfiche WebLink

12/9/02 4:11:24 pm Perteet Engineering, Inc page 5 Silver Lake Elementary Preliminary Drainage Design BASIN SUMMARY BASIN ID: C-W-WQ NAME: West Parking Lot for Extra WQ SBUH METHODOLOGY TOTAL AREA • 0.14 Acres BASEFLOWS: 0.00 cfs RAINFALL TYPE TYPE1A PERV IMP PRECIPITATION • 1.10 inches AREA..: 0.00 Acres 0.14 Acres TIME INTERVAL 10.00 min CN 0.00 98.00 TC • 0.00 min 5.00 min ABSTRACTION COEFF: 0.20 PEAK RATE: 0.03 cfs VOL: 0.01 Ac-ft TIME: 480 min BASIN ID: s-ex-002 NAME: Swapped parking area 02 yr SBUH METHODOLOGY TOTAL AREA • 0.21 Acres BASEFLOWS: 0.00 cfs RAINFALL TYPE TYPE1A PERV IMP PRECIPITATION • 1.70 inches AREA..: 0.21 Acres 0.00 Acres TIME INTERVAL 10.00 min CN • 76.00 0.00 TC • 19.60 min 0.00 min ABSTRACTION COEFF: 0.20 TcReach - Sheet L: 80.00 ns:0.4000 p2yr: 1.70 s:0.0444 TcReach - Channel L: 160.00 kc:10.00 s:0.0250 PEAK RATE: 0.00 cfs VOL: 0.00 Ac-ft TIME: 960 min BASIN ID: e-ex-010 NAME: Swapped parking area 10 yr SBUH METHODOLOGY TOTAL AREA • 0.21 Acres BASEFLOWS: 0.00 cfs RAINFALL TYPE TYPE1A PERV IMP PRECIPITATION • 2.30 inches AREA. .: 0.21 Acres 0.00 Acres TIME INTERVAL 10.00 min CN • 76.00 0.00 TC • 19.60 min 0.00 min ABSTRACTION COEFF: 0.20 TcReach - Sheet L: 80.00 ns:0.4000 p2yr: 1.70 s:0.0444 TcReach - Channel L: 160.00 kc:10.00 x:0.0250 PEAK RATE: 0.01 cfs VOL: 0.01 Ac-ft TIME: 490 min BASIN ID: s-ex-100 NAME: Swapped parking area 100 yr SBUH METHODOLOGY TOTAL AREA • 0.21 Acres BASEFLOWS: 0.00 cfs RAINFALL TYPE TYPE1A PERV IMP PRECIPITATION • 3.20 inches AREA..: 0.21 Acres 0.00 Acres TIME INTERVAL 10.00 min CN • 76.00 0.00 TC • 19.60 min 0.00 min ABSTRACTION COEFF: 0.20 TcReach - Sheet L: 80.00 ns:0.4000 p2yr: 1.70 a:0.0444 TcReach - Channel L: 160.00 kc:10.00 s:0.0250 PEAK RATE: 0.03 cfs VOL: 0.02 Ac-ft TIME: 490 min