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GERALD W.LOVELL.P.L.S. <br /> JUROEN P.SAUERLAND.P L S. <br /> LOUIS F.CAVIEZEL.P <br /> L Lovell-Sauerland & Aesociatea, Inc. <br /> S . III. . • s",Y., • ntrtlopment Comulimtt • PlAnntn <br /> November 8, 1979 <br /> LSA File No. 79-500 <br /> STORM DRAINAGE <br /> Norsol, Inc. <br /> Portion of Lot 19, Beverly Berry Tracts Division No. 2 <br /> Area of Contributing Catchment <br /> Pre-development <br /> Offsite 0.88 Acres @ C = 0.50 <br /> Onsite 2.64 Acres @ C = 0. 15 <br /> V = 0123 (43,560) = 1305 cf. <br /> 10.5(0.88) + 0. 15(2.64) <br /> Post-development <br /> Onsite Bldg. & Parking - 1 .00 Ac. @ 0.9 <br /> Storage Yard 1 .46 Ac. @ 0.75 <br /> Landscaping & Vegetation 0.17 Ac. @ 0.2 <br /> V = [0.5(0.88) + 0.75(1.46) + 0.9( 1.00) + 0.2(0. 17)] 1561 = 3854 cf. <br /> Additional Storage due to Lag Time <br /> Assume Tc = 5 min. <br /> O = CiA = [0.5(0.88) + 0.15(2.64)1 2.12 = 1.77 cfs. <br /> Mean rate of discharge = 0.89 cfs. <br /> Additional Storage Required = 0.89(300) = 266 cf. <br /> Total Storage Required = 2815 cf. for gravel surfacing of storage yard. <br /> Check required storm water detention it' L. ,orage yard is paved. <br /> Post-development <br /> Onsite Bldg.& Parking 1 .00 Ac. @ 0.9 <br /> Storage Yard 1.46 Ac. @ 0.9 <br /> Landscaping & Vegetation 0.17 Pr. @ 0.2 <br /> V = 0.5(0.88) + 0.9(2.46) + 0.2(0. 17) 1561 = 4196 cf. <br /> 23106- 100TH W. EDMONDS. WASH. 98020 PHONE 7751593 <br />