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• <br /> ' STORM DETENTION CALCULATIONS <br /> FOR <br /> •111HAGGENS, INC. <br /> 1 • • <br /> EVERETT MALL SHOPPING CENTER <br /> V October 11, 1983 <br /> U <br /> j <br /> . •Project No. 1254 <br /> Original'::sitev• getation consisted of scrub alder with undergrowth of saial, etc. <br /> Since the::.site had.apparentl:y been clear.ed::prior:to the establishment of this <br /> vegetation, an existing runoff•coefficient of:"C"•= 0.10 is justified. <br /> Ili. <br /> • <br /> Total Site area -•:435,!465..73ii 5:F. 10.0.Ac. <br /> '," Perip 'eral Landscape.Area:= 4..7,200..S.-F. =.',08 Ac. • <br /> • <br /> ' * d: 8504 s 2 :: :Exist.. "'C" ='Q.1:0 .V•r 1..0 Ft./Sec. <br /> '. : •7,0. .'Q•+.8'50/(64)(1:r'0) = 214..2 min. f := 1•.:1:7.in..,;/hr•. • <br /> I �t, ::Q:=:c (0.10)(1 17).(10•'i0)' =..1.1.7 CFS •=-Allpw: Release Rate ' <br /> Developed "C (8.92.)`(0 9'D)- .+ (.1'.•08)4(.0.•20) =.:0:.:>i2 <br /> lit 100 . . . . <br /> Qo 1'.17/(1'0':fl)i•{0:.82)' = 0.14 <br /> �-2:5.-r�2708J0.1°4._ �2�. 139.:.0 _ 1.7:. ...0 miry. <br /> .. .:Vs:.=:.i:4329) (''14:.00:) f4:0,).(0 1'i;,)•L1ilt....0.) _ -291:2::.0 C:F <br /> 139::0 • , <br /> '' Vt = (2912.0:)(10.0)10.82) = 23)47.4 .CF Storage Required <br /> U St Cone ists.Of.. , <br /> ra e q f3, 5� • <br /> <: .t <br /> :',:..1.6.8,LF ,9:0'i. :pi:pe @ 44.1:8:CF/`,F. = 7422 CF , <br /> ll .. :. • • :1'�90 LF 7:8°::6.',p�ipe Ca33.18 CFJL.F ..=. 6304:C.F <br /> . C a 7 <br /> I 1-4: `. . :�. , ,. ' '.; ..550�.F :.��`'r.td pipe ,5..9ti.CFIt1= = E745::;Cf <br /> r 34>Z:LF'=.::1.8!�`•4.pipe @ 1.77 CF/LF . = 609.•CF <br /> c. • 35;: -,i2.=.:.1`2" 4 pipe e 0.79 C ' •283 CF <br /> I :.: .,:34; :,-`.5 r,o pipe a@ 15.90 CF/LF _ '.7132•CF <br /> •:2411.4:1 F;.-- 48'' 0 pipe :0 •12::57 C,F/L.F 30.7.:CF <br /> ' `3 Total Storage ••=.230021 C.F <br /> Note Volume does not represent pipes that will be partially full or volumes within <br /> • :T.ype.l. C:,B.:.s. This will add an additional. 200`'CF_ bringing the total available <br /> ' •storage to approximately 24,000 CF > 23,878 CF required. <br /> • <br /> I 3// <br />