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<br />where R,o is excess precipitation runoff after abstraction losses <br />ii. V,o (acre feet= R,o*area= R,o(in)*area(acres)/(12 in/ft) <br />iii. V,o (cubic feet= V,o`43560 sgft/acre <br />Design volume= 2*V~o <br />b. Pond volume <br />i. Assume depth of 15ft to spillway <br />ii. Vpond= volume of truncated cone or pyramid <br />where A, is bottom area of pond <br />A3 is crest area of pond <br />h,, h3 are functions of side <br />slope and area <br />h,= f(A,, slope) <br />h3= f(A3, slope) <br />for pond depth= 15ft and bank slopes =2:1 <br />h3 (ft)= {675+ (6752+180(3V~/16-3375)J'~2}/90 <br />where VP is pond design volume in ft3 <br />c. If pond is assumed to be square <br />Crest-L~ 2 x [h3(ftv)*(2ft. horiz/1 ft. vert)J from vertex <br />Base-Lb= L~ 60 <br />Area base= Lb2 <br />Area crest= L~2 <br />• <br />IV. Rip Rap Size Determination <br />a. Method presented by Simon and Senturk in "Applied Hydrology and <br />Sedimentology for Disturbed Areas", Barfield 1983, Channel Design - <br />Riprap Linings pp185- <br />Client:CC&V Gold Mining Co. <br />Title: Storm Water Management, MLE <br />4/11 /08 <br />Page 18 <br />