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632 75TH ST SE 2016-01-01 MF Import
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632 75TH ST SE 2016-01-01 MF Import
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Last modified
4/18/2017 10:27:52 AM
Creation date
4/18/2017 12:21:33 AM
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Address Document
Street Name
75TH ST SE
Street Number
632
Imported From Microfiche
Yes
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May 29, 1980 <br />File No. 80-075 <br />Page 2 <br />STORM WATER DETENTION SYSTEM LALCULATIONS F(1R PROPOSED 9'UNIT APARTMENT (cont.) <br />Solving for A• Q � �'19 0.027 ft.Z <br />cd zyn o.62 . 2 � <br />If 2-I/4" oriflce � 0.0216 ft.2 is used [he h wtll chan9e <br />Q Z 0.19 2 <br />Therefore, solvin� for h=(cdA��� � C 0. 2 0.(121�1 / <br />64.4 <br />�x�,�h h- ?,o-%' <br />Sizing the Detention System <br />� 3.o7'=h <br />Requfred volume of de[ention = 300.72 ft.3 n"d 4��I��iJ � <br />4' dia. Type 2 MH = 12.57 f[.3/v.f. <br />v.f. a vertical feet above flow Iine uf outlet <br />CB 7ype 16 = 5.79 ft.3/v.f. <br />18" culv. - 1.767 fr.3/l.f. <br />21" culv. = 2.405 ft.3/i.i. <br />12" culv. � 0.785 ft.3/l.f. <br />CDMH No. 1� Type II 48" 3.07 v.f. x 12.57 ft.3/v.f. <br />50 I.f. 15" - 16 ga. hel. alum. culv. @ 2.405 ft.3/I.f. <br />CB No. 2 Type 16 = 1.66 v.f. x 5.79 ft.3/v.f. <br />73 I,f. IB" - 16 ga. hel. alum. culv. @ 1.76 f[.3/l.f. <br />CB No. 3 Type 16 = 1.50 v.f. x 5.79 ft.3/v.f. <br />To[al detentlon provided <br />Requlred volume <br />Excess volume provided <br />Tlierefore, o.k. <br />� <br />3H.59 ft.3 <br />120.25 ft. <br />9.61 ft.3 <br />128.99 �t.3 <br />b.68 ft.3 <br />q06.12 ft.3 <br />-3�0.72 ft.3 <br />5.4o ic.3 <br />,���''s r ri i �"-� <br />,P' a ; �;r'�, -, I¢� :. <br />� , `� - �, , �. <br />; ; 2 �.;''�,; �: <br />, .: ,� „ � ` ,;' <br />�, � �A � _'��' - � ,r <br />��� �., � � �'�i <br />..::•r.: i �; <br />� <br />
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