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Step 5. Aliowable release rate <br /> The allowable outflow, Q, can now be determined b_v use of the rational <br /> fo-mula, Qallow-Cexist� A <br /> Siep 6. Design Storm <br /> In most cases, detention facilities .^.:ust be designed for a 10-year or 25- <br /> year storm. For developments ir the area served by the combined sewer <br /> system (Area A on :'igure 3) e. 10-year design storm wi[i normally be requi�:ed. <br /> In all other azeas of the Cit�, a 25-year design storm will �e required. <br /> In extremely sensitive are�s, a 50 or 100 year design storm n:ay be required. <br /> Step 7. Storage VolumP, VT <br /> The amount of storage required is tlie difference beYween the volume <br /> I <br /> of water released from the detention facility and the volume of runoif <br /> discharged into the facility from the time runoff begins until the i�fla�w <br /> rate equal Q��oW, •,' ' <br /> f,; <br /> This volvme is represented qualitatively by the cross-hatched area show j% �� <br /> • on the sketch below and determined by the folfowing equation: V�. = S A �dev. <br /> h� <br /> � <br /> t•� , <br /> . i ;. <br /> Wherc VS is deterrnined by use of Table 2 and Cdev by Table 1. <br /> f/ou� Rar'e d _ — � <br /> C,�E 3/5�,�1 ��� Qo/%w <br /> . � -�c <br /> �� ouf��w <br /> �/!7e 4/h�n) <br /> �;, <br />