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Two Rivers Gravel Pit Mine <br /> Riverside Berm Failure Analysis <br /> and Flood Control Mitigation Plan <br /> 7ech"olooicess January 22,2020 <br /> Crit W.S. (ft) 4682.96 Flow Area (sq ft) 3156.62 2205.73 857.25 <br /> E.G. Slope (ft/ft) 0.000879 Area (sq ft) 3156.62 2205.73 857.25 <br /> Q Total (cfs) 24500.00 Flow(cfs) 11447.95 11125.80 1926.25 <br /> Top Width(ft) 1094.17 Top Width (ft) 525.00 275.00 294.17 <br /> Vel Total (ft/s) 3.94 Avg. Vel. (ft/s) 3.63 5.04 2.25 <br /> Max Chl Dpth (ft) 9.39 Hydr. Depth(ft) 6.01 8.02 2.91 <br /> Conv. Total (cfs) 826212.9 Conv. (cfs) 386058.8 375195.2 64959.0 <br /> Length Wtd. (ft) 2034.00 Wetted Per. (ft) 528.42 275.03 294.25 <br /> Min Ch El (ft) 4677.00 Shear(lb/sq ft) 0.33 0.44 0.16 <br /> Alpha 1.17 Stream Power(lb/ft s) 1.19 2.22 0.36 <br /> Fran Loss (ft) 3.01 Cum Volume (acre-ft) 132.25 86.19 20.33 <br /> C & E Loss (ft) 0.03 Cum SA(acres) 25.68 12.61 7.18 <br /> Warning: The cross-section end points had to be extended vertically for the computed water surface. <br /> Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance)is less than 0.7 or greater than <br /> 1.4. This may indicate the need for additional cross sections. <br /> Warning: The energy loss was greater than 1.0 ft(0.3 m). between the current and previous cross section. This may indicate <br /> the need for additional cross sections. <br /> Note: Multiple critical depths were found at this location. The critical depth with the lowest, valid, energy was used. <br /> CROSS SECTION <br /> RIVER: SPR <br /> REACH: Two Rivers RS: 0 <br /> INPUT <br /> Description: Downstream corner of site berm. <br /> Station Elevation Data num= 6 <br /> Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev <br /> 0 4680 175 4678 575 4679 600 4674 840 4681 <br /> 860 4684 <br /> Manning's n Values num= 3 <br /> Sta n Val Sta n Val Sta n Val <br /> 0 .04 575 .035 840 .04 <br /> Bank Sta: Left Right Coeff Contr. Expan. <br /> 575 840 .1 .3 <br /> Left Levee Station= 0 Elevation= 4684 <br /> CROSS SECTION OUTPUT Profile#10-yr <br /> E.G. Elev (ft) 4681.02 Element Left OB Channel Right OB <br /> pg. 52 <br />