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Assumed values for Chimney <br />Rock (inchesl: <br />Particle Existing <br /> Riprap base of <br />size channel <br />Des 5 1 <br />DSO 12 6 <br />Des 15 12 <br />Ratios recommended by Calculated Fitter <br />Corps of Engineers and ratio using needed? <br />Bureau of Reclamation assumed <br />values YeslNo <br />D,S riprap/D85 base<5 0.3 No <br />5<D,S ripraplD,S base<40 5.0 No <br />DSO riprap/DSO base<40 2.0 No <br />Protection at hydraulic transitions -Using the flow velocity of 5.5 fps from the <br />SEDCAD run in the submittal, the Froude number of a riprapped channel would be <br />calculated as SSft per sec./(32.2 fdsecz)(1 fl. flow depth) = 0.17. This value is less than <br />4, indicating violent hydraulic jumps will not occur at channel exits; therefore, additional <br />protection will not be needed at these locations. <br />Minimization of re-disturbance -The design specifies small tracked equipment for <br />transporting rock riprap with a minimum of trips and hand placing the riprap. <br />2 <br />