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~i <br />• <br />Pond Discharge (cfs) D50Stone Diameter <br />Inches) <br />A 717 11 <br />D (channel along haul road) 286 8 <br />D (90' spillway) 286 6 <br />G (routed outflow) 82 6 <br />G (no routing in pond) 262 7 <br />The methodology used to size the riprap for these locations is based on the safety factor approach <br />(Stevens and Simons, 1971; Stevens et al., 1976). This procedure has been previously used in design of <br />the channel improvements in Areas 31, 41 and 51. The basic procedure involves application of a Flow <br />resistance equation that Bathurst et al. (1979) developed for flow in high gradient streams having large scale <br />roughness effects. The safety factor is defined as the ratio of the forces (moments) tending to cause <br />rotation of the particle out of the bed or bank, to the gravitational forces tending to keep the rock in place. <br />This report was prepared under my direct supervision. <br />Water Engineering & Technology, Inc. <br />....nuu <br />~J~ rl`~PPPG~ST gF.9S'pZ~ <br />Mark R. Peterson, P.E. B ~ rrs <br />#ea 24390 W <br />Professional Engineer 24390 ,_ ::°,q ~?'O <br />OF <br />U <br />16 <br />Water Engineering R Technology. Inc. <br />