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EMERGENCY SPILLWAY <br /> <br />.i <br />•~ The design flow for the emergency spill:ay was computed using the <br />outline of computational procedure for inflovr design flood as determined <br />for design thunderstorms and general storms, :vest of the 1050 meri- <br />dian. 1/ This method when placed over the 677 acre Coyote water- <br />shed led to a 2000 cubic feet per second (CFS) peak flo:v. <br />The emergency spillway will have an en~,rance width of 95 feet (mea- <br />sured at the bcttom). The spillway will make a smooth transition to <br />a 55 foot :vidth in 200 feet. The slope of the wells will be 1 to 1 <br />for 300 feet. At station 3+G0, the walls begin to flatten to a 1-1/2 <br />to l slope. A cobblestone apron will be installed at the entrance.to <br />the emergency spillway. The t7eor and :valls vrill also have cobblestone <br />placed to the design water elevation. At station 3+00 rip-rap :will be used <br />on the floor and walls fora distance of 500 feet. <br />Emercencv Seillwav Capacity- <br />Q = CLH3/2 <br />S =~ Vn f 2 Gh = C S 1+52 1 L <br />1,486 r 2/3 L ll 2 J <br />n = 0.030 <br />2 2 <br />hL = Kc (V2 /2g - V1 /2g~ Kc N 0.10 • <br />2 <br />Vl~g + Di = V2 /2g + D2 + pZ + hl <br />Tan of = 1/3F; d =Angular Variation of the side wall from center line <br />F = V~~ <br />Sinlet = 1.2°0 <br />Desicrn of Small Cams, U.S. Government Printing Office, <br />Washington 1974 <br />~~ <br />,~. <br />- 9 <br />. REVISED FEB 13 '87 <br />