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. , <br /> �, :, .r <br /> �;.- -. �,.. <br /> ' � _-- ,. Sheet Z- of Z <br />� � PN e�-�.� <br />� P 0,! T: o tJ�!��W �PAe.�tit�.t�� Date � 18ra <br /> .R.A. <br /> ----- ----.' <br /> D.A. = a,8 L��, - 3�1 t o SF <br /> il <br /> I <br /> I <br /> Pre-Devel�opment <br /> ;I �,Ni, -� Storm Ratnfal l Runoff � <br /> , <br /> I 25 Yr. 9" �.�8�' � � <br /> ' 100 Yr. >>" � � <br /> � Pealk Ra te of D i scha rge Q = 1� � CFS _ <br /> 25� Yr. Runoff Vol . - 2�,8l0 " x 3 4�1 1 O �� x 1/12 = S,2"13 <br /> 100� Yr. Peak Rate Q = �p CFS x ,�.$" x ,o SF = 4� � CFS <br /> Post Dev,�elopment ` <br /> Wei�ghted CN � a� - - � 8 0 �� �-CN `�8 = S4� 8 40 <br /> �Y� v►�Q✓i-� 10� �44 5�F c tJ �8 = 1 , ��2,�, t Z <br /> � �:p,�r� 18�18ca ��� c� e_t�1� 3�= �i o��2� 4 <br /> � �� <br /> � <br /> �4a'l I d 2,32��too b - <br /> _ • <br /> CN 2:3 2�d i to b�o __ + 3 4 'I � � = G � <br /> T Storm Rainfall � Runoff <br /> 25 Yr. •72 <br /> '100 Yr. >>" �_ ' <br /> Pea,i: Rate of D i scharge Q = __� CFS � <br /> 25 Yr. Runoff Vol . - 4.�2 " x • 34,"i � o �� X ���2 = f 3,to�Z cP <br /> 100 Yr. Peak Rate Q = � CFS x �f�� �" x _�_SF = Cc� �- CFS <br /> Retention Required <br /> �25'� Yr. Vol . l� , (nszc.� - $ Z13 �("r = �,31� c-F <br /> �1 st inch Rainfall = Runoff <br /> '100 Yr. Q Pre = _ , �Vs � <br /> Q Post — Vr <br /> �� _ x �� x x1/12 = _ <br /> _— - -- <br /> Retention Available <br /> Tip @ EL. � (,o .o - �j.� 4a SF Eff. Depth '2- � a <br /> 'Bot.@ E.. � t�2,� - l (�oa SF <br /> Vs = 3840 + l(n�.,•�_ x ' e 'r! 44� C.F. <br /> 2 � <br /> 1%�2"/72Hr. = 0.042'/72Hr,. - 34,1 t D S F x: 0.042'/72Ht'. = 1,�4�$ GF' <br /> ' Pe�rmeab i 1 i ty <br /> � <br /> i Per SCS i3`� i�f� /��� = �•�� '�� <br /> � <br /> Plrcolation Available - <br /> �(oD� SF x � � ��b '/H�. e . 1-12� CF/Hr. • <br /> � <br /> I <br /> i <br /> i <br /> � <br /> - � <br />