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_ _. . -- � - - --- - - -------- - <br /> __... . : . _____ .___ _...._._._.._.. ._. . ____...._�..���._._..:..� <br /> _ _ __ <br /> __._.__... _ , . ..___ -� <br /> ._. __... .�._. .--------..._._..-�----- �----------- .'�"."'"'r= <br /> .. -..� . : �--...._ _ . .��. <br /> . . ':� ,. <br /> . . . : :,�_ = <br /> . . . :'�;:- <br /> . . ::::� �sr. <br /> ., : , <br /> . . �=.. �, . <br /> • -;i��,�i� <br /> . ILLUSTRATIVE EXAMPLE ' � , , � : `_;�,� <br /> ' . . • . . "'.:�� <br /> Area o! site 1.37 acres ' T;�` <br /> ROC betore devalopmant 0,15 • �:.4;3;!i <br /> iWC after davelopcce t 0.90 . `�%�^ <br /> . Design storm - prede lopment freq 1 in 10 yenrs � ' "'�"�"•_ -�r <br /> • post d elopmant freq 1 in 10 years ' ' � ' � �"��� <br /> Durat3on , 20 nins • ' ''_�+z <br /> intens.tty • 1.3 1 /hr ' , ' ''� :.?.`:'� <br /> ' � . . ;L;,` <br /> Predwslopm�nt runofF . .'� <br /> : ; <br /> • . . ,�"�,� <br /> 0.15 �l_3 x 1 x 1.37 x 43560 cubic f t ' , ' "'"". <br /> L3 12 /� . . ,;:... <br /> = 0.15 x 2155 cubic feet / . '-^i" <br /> � 323 cubic faet � . , <br /> Poat development zunoff = 0.90� 155 cubic feet • , _ � � •'JC'' <br /> a 194�d enb a feet ' . . <br /> • Runof£ diflemntial � 1617 a:bi feet • ;•' . <br /> , � ' . `';:rt:�.':, <br /> Additional storage due to ag tima eq ls (time oE ooncentration)X(mean rate • �, � <br /> oP discharge ovar the per od) . • . ' <br /> • Asswna timn o! concentra ion = 5 miri: � � • • . <br /> r • Rate of discharqe e 0.2 cubic £t. per s c ' ' • <br /> Mean rate of discharqe G.135 cfe: • ' . <br /> .;. <br /> Additi.onal storeqe r uired = 0.135 x 300 � ", : <br /> . • � � ' � 40 cft .� . . • . � . ' <br /> petention ebornqe posed � 1657 cft � - � <br /> . • . :.:... <br /> ' Orifice openinq 2-1/4 inches • , <br /> • discharga ��15 x 1.3 x 1.3�cfe . • - <br /> ' � 0.27 cPs ' ,�.-.::ir.,�.'el.;i: <br /> head � 3.76 feet ' . . 4 :':`v:...' '� <br /> outlet pipe . '" .. , _ ;.i^c <br /> ' Dtameter 12 inches • . - • •- • • . • t :- <br /> Slopa 1 £t. in 200 • ' <br /> Capacity �L3 /� . f',' • <br /> • .. 4 � 0.463 D 7 '�. , . .:'^-•.:: <br /> N. . � . —:.:::��r: <br /> - . . . •r'e;'-"'�;;a <br /> � � . . . . � ' �,z:.'`-`��*. <br /> � 0.463 x � x ' ';'.'",J.�-y,e''�� <br /> � .. <br /> ,�lY. -','r�t <br /> � . • • . • ^•'E��k.� <br /> e ' 2.73 aFs . _ .:�"'� <br /> From nomoqranh Q = 2.7 cfe . � .. , �'r�` <br /> :.=F.:'. <br /> . . � • . . . � ..-.,n,,,;�, <br /> 4 <br /> , . • . �'f���:l <br /> . , ' •}� � <br /> . . . . - .1. !ii'. <br /> . ' � �i`�: l.-f-}11n} <br /> .. • � . I...u..�t•:�::• <br />