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STORM DRAIN STORAGE REQUIREMENTS <br />A = ?f� bG . <br />Ce = .05 <br />Cd = .(?3 <br />L = 7� �- <br />5 = 3� <br />vr = ,qr,'� '�� <br />T� - �� �nIA <br />l�p= .�2•lN��. <br />4e = o`�z �i <br />Qo = .d13 <br />Q <br />T = ���t.�'M�a <br />�s '':Z�17.�' <br />vt-41�z� � <br />. - �� <br />� <br />a <br />I <br />� <br />Area of Basin � <br />Existing coefficient of .imperviousness of Basin <br />ground � � <br />Developed coefficient of imperviousness of Basin <br />as planned • <br />Length (maximum of overland travel) <br />Slope (average from Basin�high point to low <br />-..point on watercourse) • <br />Runoff rate . ' • <br />���� <br />Time of concentration�from fnrmula: <br />10 + (L � Yr (60) = Tc = 3'.$ , <br />Rainfall intensity from rainfall curve _ <br />Existing outflow.from site iny eauation: <br />CeI�DA = Qe =,CS�.`���w� . <br />Maximum outflow permitted.per acrr imperviousness <br />from formula: ' <br />Qo = d - ��� � , 07� <br />Storage time (to capacity) from formula: <br />T= - zs -�- z,� = 167.� <br />, .o-ns <br />Required valume of storage per acre in Basin <br />from equation: <br />��. 43zsfCl�7,� _ �D ���3x16�,� <br />�?,5't � <br />Required volume of storage for this Basin from <br />equation: ����x 7 <br />VT = VSAC p l oF 2 <br />= 3z,�'j. % ���-�3� <br />�' � `�3� S��o : , o� . <br />