Laserfiche WebLink
COBALT BUILDING DRA(NAGE CONTROL CALCULATIONS <br /> SUMMARY OF DRAINAGE AR.EAS: <br /> ExistinF On -sitc Arca _ <br /> Squarc Fcet <br /> 3,701 <br /> Existing Buildings 338 <br /> E�isting Concrctc Pa��emcnt 10,153 <br /> L:indscaping/BrushlUndc��clopcd �__ <br /> Total E�isting On -Sitc Arca <br /> 14,192 <br /> Dcvcloped On-Si1c Arca: Squarc Fcct <br /> Building Roof 4'� <br /> 7,246 <br /> A/C Pavement &Sidc�valks � �3 <br /> L;mdxaping ___ <br /> TuWI Dc��clopcd On-site Arca 14,192 <br /> STOkiv1WATER DEfENTION: <br /> Stortn watcr dctcntion is not required for this site per Kirk Brooks, Evcrctt Public Worl:s <br /> DcpartmcnL In licu of pro��iding on-sitc dctcnlion, a cash dcposit will bc madc to the <br /> City Capilol Impro��cr.icnt Fund No. 340 in accordancc���ith Ciry Ordinance No.670-80. <br /> Refcr to thc drainagc calcul�tion submission form complctcd for this projcct. <br /> ON-SITE COLLECTION PIPE CAPACITI ES: <br /> Check thal sizes and slopes of thc collcction pipes are sufficicnt for the expccted Ilows. <br /> Collector bct��'ccn CE3 7& CB (: <br /> Contribu�ing Arcas: Arca z C <br /> Arca C <br /> Impervious 1,463 0.9 1.3�� <br /> Pcrvious 187 0.2 37 <br /> Tol:il 1.650 0.82 1.354 <br /> Assumc Tc= 5 minutcs <br /> Thcreforc from the Snohomish Counry "Rainfall Intcnsity �'S• �nut sn� Curve, <br /> Tc= 5.00 <br /> i (25yr) = 3.1 inchcs!hour <br /> Q Ix°k•�5��r- 0.096 cfs <br /> L,ayton &Scll <br /> Pagc 3 of 6 5/17/95 <br />