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100 -Year Event - Split Flow Model <br />The split flow model computes the discharge split at the spillway. The worst case hydraulic conditions <br />also occurring during the 100 -year event with a spillway velocity of 12.6 ft /sec and a depth of 6.9 ft <br />through the spillway. Results are similar to the single flow path model. <br />The resulting riprap specified can have max d50 between 12 and 14 inches. CHANLPRO output is <br />provided below. <br />PROGRAM OUTPUT FOR A CHANNEL WITH A KNOWN LOCAL <br />DEPTH AVERAGED VELOCITY, STRAIGHT REACH <br />INPUT PARAMETERS <br />SPECIFIC WEIGHT OF STONE,PCF 165.0 <br />LOCAL FLOW DEPTH,FT 6.9 <br />CHANNEL SIDE SLOPE,1 VER: 3.00 HORZ <br />LOCAL DEPTH AVG VELOCITY,FPS 12.60 <br />SIDE SLOPE CORRECTION FACTOR K1 .99 <br />CORRECTION FOR VELOCITY PROFILE IN BEND 1.00 <br />RIPRAP DESIGN SAFETY FACTOR 1.10 <br />SELECTED STABLE GRADATIONS <br />ETL GRADATION <br />NAME COMPUTED D30(MIN) D100(MAX) D85/D15 N= THICKNESS/ CT THICKNESS <br />D30 FT FT IN D100(MAX) IN <br />3 .61 15.00 1.70 NOT STABLE <br />4 .73 .73 18.00 1.70 1.50 .89 27.0 <br />5 .82 .85 21.00 1.70 1.00 1.00 21.0 <br />D100(MAX) LIMITS OF STONE WEIGHT,LB D30(MIN) D90(MIN) <br />IN FOR PERCENT LIGHTER BY WEIGHT FT FT <br />100 50 15 <br />18.00 292 117 86 58 43 18 .73 1.06 <br />21.00 463 185 137 93 69 29 .85 1.23 <br />EQUIVALENT SPHERICAL DIAMETERS IN INCHES <br />D100(MAX) D100(MIN) D50(MAX) D50(MIN) D15(MAX) D15(MIN) <br />18.0 13.3 12.0 10.5 9.5 7.1 <br />21.0 15.5 14.0 12.3 11.1 8.3 <br />