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COBALT BUILDING DRAINAGE CONTROI.CALCULATIONS <br /> Trial Pipc Pipc <br /> Dia. (in) Matcrial n Slopc Q (cfs) <br /> 8 Concretc 0.013 0.46 8.19 ok <br /> Chcck vclocity, using"Elements of Circular Scctions": <br /> Q/Q full = 0.07 <br /> V/V full = 0.57 (from chait) <br /> V = 13.38 fUs (high, bul ok) <br /> Cc�llccl�r bch��ccn CB 4 & CQ 3: <br /> Contributing Arcas: <br /> Arca C Arca x C <br /> Impervious 9,123 0.4 8,211 <br /> Pcrvious 1,760 0.2 352 _ <br /> Total 10,883 0.79 8,563 <br /> From previous calculations, i =3.1 in/hr for a 25 ycar stomi (C� 5 minutcs). <br /> Q ix�k,�5 Y�= 0.609 cl's <br /> Trial Pipe Pipc <br /> Dia. (in) Malcrial n Slope Q (cfs) <br /> 8 Concrcic OA13 0.01 1.21 ok <br /> Chcck vclociry, using"Gemenls of Circular Scctions": <br /> Q/Q full = 0.50 i <br /> V/V full = 1 (from chart) I <br /> V = 3.4G ft/c ok <br /> PUDLIC STORM DRAIN CAPACITIES: <br /> Notc: Thc cit�� rcquires thal srorm drainagc pipe in lhc public right-of-��•ay bc sized for a <br /> 10 ycar storm. To bc consen�ati��c���c will design thc pipc for a 25 ycar storm. <br /> public Storm Drain in alle�bet���ecn CB 3 and CEi 2: <br /> Contribating Arcas: <br /> Arca C Arca s C <br /> Impervious ]3,373 0.9 �2,036 <br /> Pcn�ious 1,835 0.2 3C5 <br /> Total 15,198 0.82 12,401 <br /> �rom prcvious calculalions, i =3.I in/hr for a 25 ycar storm (C�'S minutcs). <br /> lay�on & Scll Pagc 5 of 6 5/17/95 <br />