819 N BROADWAY WASHINGTON STATE UNIVERSITY 2018-05-11

Conveyance Calculation WSU NPSE Asphalt Parking Lot-Big J's Site I 6/28/2016 _ 25 YR System Runoff Capacity Check Runoff Rainfall Pipe Pipe From To Upstream Downstream SD Pipe Drainage Coefficient Tc to Intensity Cumulative Diameter Pipe Slope Capacity Percent Drain ID Structure Structure invert invert Length Area(A)sf (C) C*A Structure in/hr Runoff Runoff cfs (in) (%) cfs Capacity Check SDI CBI. CB2 79.16 78.8 28 4710 0.90 0.10 5 3.07 _ 0.30 0.30 12 1.3% 5.25 6% OK SD2 CB2 CB3 78.8 76.7 108 10880 0.35 0.09 5 3.07 0.27 0.57 12 1.9% 6.46 9% OK SD3 CB4 CB3 77.06 76.7 13 17350 0.90 0.36 5 3.07 1.10 1.10 12 2.8% 7.71 14% OK SD4 CB3 Pond 76.7 76 23 0 0.90 0.00 5 3.07 0.00 1.67 12 3.0% 8.08 21% OK SD5 CBS Pond 77.16 76 35 10160 0.90 0.21 5 3.07 0.64 0.64 12 3.3% 8.43 8% OK SD6 CB6 CB7 82.72 77.37 152 7900 0.90 0.16 5 3.07 0.50 0.50 12 3.5% 8.69 6% OK SD7 CB7 Pond 77.37 76 12 8780 0.90 0.18 5 3.07 0.56 1.06 12 11.4% 15.65 7% OK