1305 W CASINO RD 2016-01-01 MF Import

. � � � . � -�- • ' � . March 9, �979 • File No. 5657� Pagc 2 STORM WATER DETENTION SYSTEM CALCULATIONS FORPROPOSED APARTMENT BLDG. LOMPLE% Sizin [he Orifice � o, Q allowable = 0.55 c• f•s• Using [he orifice equatfon Q � cdA 2yh Assume h = 3' Solving for A = ---Q- = 0.55 . 0.0638 it.2 td 2gh 0.62 6 . 3 Use 3-3/8" orffice = 0.0621 , therefore, h will changc Solving for h � ICdA) �g � �0. 2 50.0 21��4.4 - 3• 16' \ � CB No. 2 ' Q allowable = 0.45 �.f.s. Using 2-I/2" oriffce �d orifice equa[fon Q = cdA 2gh h = 5.47' Q = (0.62) (0.0341) �4.4) (5.47) = 0.3968 c.f.s. = 0.4 c.f.s. Sizin the Detention 5 stem Tota storage requ red = I 19.7 ft.3 Using both surface ponding and subsurface pfpe slorage If 5� slope is created in the second parking lot to the nortli curb Iine with maximum water surface depth = 0.5' a[ the curb line, then 0.25' x 17 � x 92' ' 391 cu. i[. The remaintng storage wfll be subsurface pipe storage due to the topography of the remaining site LB No. I (Typc II) = 12.57 ft.3/v.(. 3. 16' x 12.57 ft.3/v.f. = 39.72 ft.3 CO Nos. I-2 - I10 I . (. 24" hel . alum 14 ga. (' 3. 142 ft.3/I . f. = 345.62 ft .3 CB No. 2 (7ype II ) = 12.57 ft .3/v. f. 5.47' x 12.57 ft.3/v. f. 68.76 ft .3 CB Nos. 2-4 - 155 I .f. 24" hel . alum. 14 ga. @ 3. 142 rc.3/�.�.= 487.oi ft.3 CB No. 4 (Typc 16) = 5.79 ft .3/v. f. 4.70' x 5.79 ft.3/v. f. 27.21 it .3 CB Nos. 2-3 - 5 I .f. 12 hel . 14 ga. alum. @ 0.7854 �t•3�1 • ( • = 3.93 �t .3 CB No. 3 (7ype IS) 3.91 ft•3/v• �. 3.3' x 3•97 �t .3/v. f. = 13. 10 ft.3 Pond area = 391 .0 ft .3 CB Nos. 2-5 - 22 I . f. 16" hel . 14 ga. alum, p 1 .767 ft.3/l . f. 38.87 ft.3 CD No. 5 �7ype 1G) 5.79 ft.3/v.f. 4. 5' x 5.79 ft. 3/v. f. = 2G.oG ft .3 To[al s[oragr provided �4t�� ,pp ft.3 Total requiied 1419.7. ft .3 Excess stora9e 21 •58 �� •3 Thcrc(orc, o.k.