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COBALT I3UILDING DRAINAGE CONTROL CALCULATIONS <br /> Trial Pipc Pipc <br /> Dia (in) Maicrial n Slopc Q (cfs) <br /> 6 Concretc 0.013 0.0'_' 0.79 ok <br /> Chcck vclocity,using"L-Icmcnts of Circular Scclions": <br /> Q/Q full = 0.12 <br /> V/V full = 0.67 (from chart) <br /> V = 2.71 ft/s ok <br /> Collcctor bct�vecn CB 6&CB 5: <br /> Contributing Arcas: <br /> Arca C Arca s C <br /> Impervious 8,344 0.9 7,510 <br /> Pcrvious 8'_7 0.2 165 <br /> Towl 9,171 0.84 7,675 <br /> From prcvious calculalions, i =3.1 in/hr for a 25 ycar storm ('� 5 minulcs). <br /> Q Ix^�{;•?5)'�= 0.546 cfs <br /> Tiial Pipe Pipc <br /> Dia (in) Malcrial n Slopc Q (cfs) <br /> 8 Concrctc 0.013 0.156 4.77 ok <br /> Chcck��clociry,using "Elcmcnts of Circular Scctions": <br /> QIQ full = 0.11 <br /> V/V full = O.G4 (from chai7) <br /> V = 8.75 fUs ok <br /> Col rctor bct�vecn CB 5 to CB 4: <br /> Contributing Arcas: � <br /> Arca C Arca x C <br /> Impervious 9,]23 0.9 8?I1 <br /> Pcrvious 1.7C� 0.2 352 <br /> T��i�� 10,8t33 0.79 8,Sb3 <br /> From prcvious calculations, i =3.I in/hr for a 35 ycar storm (C� 5 minutcs). <br /> Q pcak,25 yr = 0.609 cfs <br /> Laylon & Scll Pagc 4 of 6 5/17/95 <br />