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y <br /> IV. STORA�E <br /> The instant storage begins until the peak storage is attained (Min.) • <br /> �,,_,_rLs �l! <br /> �-,-�� � <br /> T = -25 + Qo Z <br /> 0 <br /> � <br /> J�. �`7U(v ... <br /> 7 = -25 + 10..1�fr I• �'�o m <br /> � �J <br /> ur o--� <br /> _Z5 + 14T � `I � . -i -n <br /> T = ..,-� <br /> = 29 J' ;�, L'+"(^s7 a' r' <br /> T � <br /> mo <br /> V. VOLUME OF WATER FLOWII�G INTO THE RENTENTION BASIN PER ACRE IMPERVIOUSNESS (FT /A� o� <br /> ..-, -� z <br /> �e-�'_ 2 S y�' m~ <br /> .. <br /> `�s��� c Z <br /> Y -�i <br /> V = ��- + 40 Q T � r x <br /> S T + 5 � o , �: ��, <br /> � ' ,� � <br /> , ��3��� �� , . �. nt- � �� <br /> �s = � + ao Ee:rr6) �4 ,�� <br /> � „� 1 1� � �.liC,l �� <br /> _ .� - � <br /> s - - �, � N <br /> vs �m'� I��fi`I : , � <br /> , �4 <br /> 3 �� /j�• �m <br /> VI. MAXIMUM VOLUME OF WATER STORED IN RETENTION BASIN FT / 1 � J l ; D <br /> , a ' � <br /> ,�, ' ��' -a <br /> S- _ <br /> 10 Year n <br /> �' �t:� z <br /> V = �S x Area x Cp ��` � �'� , -� <br /> T , c'I � � <br /> �; + '� {�� � <br /> VT = j,�0 cf x 0.47 ac�x 0.9 �U�� `� ' � <br /> i� •-'• <br /> V = 300"cf �'�f�� �� �!�� m <br /> T <br /> VII. PIPE SIZING ANALYSIS <br /> = 0.9 (1.6) (0.5) = U.72 cfs <br /> QDev ' <br /> An S" conc. pipe at S = 0.005 will carry (n = 0.012) <br /> � <br /> p Q = p,9 cfs lication II <br /> Therefore, 8" conc• is sized adequately for this app I <br /> I <br /> i <br />