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. <br />/ � <br />/� � ��,/ �'lflrA��..i <br />l: ����y��;. <br />STORl1 DMIN STORAGE REQUIREMENTS ' % �J �u�� ��'`' , .. ; <br />A - 2 �cres � <br />�� O I O , 0� � <br />�d - a 53 <br />�. s %SO feet <br />. <br />S ' 3. ?� <br />� ` O. ` <br />r <br />T� - 3S <br />I�� ` • �(o <br />ve = I. q Z <br />�i�` �,. �` ;�. � � ,. <br />� <br />�. �, �p�� �,���L� ��a y, � <br />Arra ot 8asin f <br />Y � � �/� <br />ft/sec. <br />Existing coefficient ot imperviousness of <br />Basin ground <br />Developed coefficient of imperviousness of <br />easin �s planned <br />Length (maximum) of overland travel <br />Slope average} fran Basin hlgh point to 1wv <br />point on Matercourse) <br />Runoff rate <br />minutes Time of concentration from forniula: _ ?`.g <br />�� Z _ 10 + (� + Y� (60)) = T�- Io+oT��� <br />in/hr. Rainfall intensity fran rainfall curve <br />(10-year storm) <br />cfs <br />Qo = Q, Ig cfs <br />� T • `�-� �O <br />, zs <br />�S ` Z�44 <br />minutes <br />� <br />Existing outflow from site usin e�u tio <br />��Ilo � Qe=o.lo(o.tib�zo _ �,OS1�,�1a�(��� - <br />L <br />Maximum outflow permitted per acre �,,�z <br />imperviousness from formula: Q■ Q : AC = — <br />0 t' d yu(,S3j <br />Storag^ time (to capacity) from formula: <br />T= 2�0` _ ZS = q7, 6 <br />.r8 <br />cf/A/Cd Required volume of storage per acre in Basin <br />from equation: �5 � 4329 �i7:[ _�q�d�C�g\ <br />1 ZZ. (, l <br />Yt = Z�� pS6 cubi c feet <br />�/ti.�p �IOWtn� l Ra,ii�p <br />3G <br />' �17 <br />1 <br />Required voluns of storage for this Basin frde <br />equation: Yt = ySACd =2744C2.��,53 <br />f ���7 rrcr.�} _ �ZGwl3'�� ��BBx�sb�j+ �z�837�`1��,. %z��e,i�� <br />_ ����i�" �'' <br />/�V6,. i�t�rH = �c'r <br />l0-+,.1� vo�.vr„ = 44,656 FT3 <br />�6T�'tGT �4tnP = �z�3���4.B�lSi = ��8� �� <br />l�l�r Vo`v.,e = 43, s76 �-3 � <br />. APPEN[ti� <br />