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r <br /> ,,,~ Ae ar Coal Company _ R580 <br />' UTE ENGINEERING & SURVEYING CO. 5~rt, ao . _4 _ or._ 6 <br /> P. 0. Box 674 355 Main Street <br />FDR <br />3_!1g0 <br /> COLORAD081416 on~ca~nleun+ <br />DELTA _ on,E <br />_____. <br /> . <br />(303) 8747593 0,l cneo nr Dore _ __. <br /> Rev.ih ~orrJ, ahe noted .~n Schtpt Type Fiyurc 2 .05.3 (4) (b) -2 (con't) <br />' <br /> LS = 0.280, Table 3, page 12, PnedLe#,i.ng Ratnbak~ EnoaEon Loh~e~, U.S. Depantmen.t o6 <br />' C = 1,0 Aga~cu2twce. <br /> P = 1 <br />' A = 40(•6°) ( 0.280) ( i ) (1) = 7.73 `~/A <br />Sediment yield = 6.63A (7.73, T/n.) 51.24 T/yr <br />1 <br />3 year sediment yield = 51.24 1'/yr(3) = 153.71 T <br />t 153,71 T SED.(2000 #/ton) _2653 ft3 <br />115 #/ft <br />' Total Sediment Volume = 986 + 2673 =3659 ft3 (0.084 acute-6ee.t on 0.002 AF/A ) <br />Thene~one, u.5e 0.02 acne-beet/acne on 29,778 cu6.t. <br />1 Total pond volume = 4094 + P9~778 = 33,872 = 0.78 AF <br />Spillo:ay 25 year storm <br />Use rational formula for small areas w/no danger tc human life for <br />' spillway design. <br />0 = CiA <br />C = Runoff factor. <br />i = Intensity based on time of concentration <br />' A = Acres <br />3 .385 <br />T _ r 11. 9 L l From <br />' c I }1 1 Design of Small yams USR:R 1973 <br />L = .5 11 = 500 ft <br />T _ 11.9(0.5)3 '395 = .11 HR <br />' c [ 500 <br />Adjustment for CN = 35 <br />' 1 <br />rc = 2.8 T~ = 2.8(.11) _ .31 ~R <br />• 'c <br />'I REVISED May 15, 1981 <br /> <br />