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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 /> 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: 3051 <br /> INPUT <br /> Description: SE corner of site just upstream 90 degree bend. <br /> Station Elevation Data num= 5 <br /> Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev <br /> 0 4684 134 4679 528 4686 637 4683 919.69 4688.81 <br /> Manning's n Values num= 3 <br /> Sta n Val Sta n Val Sta n Val <br /> 0 .04 134 .035 528 .04 <br /> Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan. <br /> 134 528 1017 1017 1017 .1 .3 <br /> Left Levee Station= 0 Elevation= 4690 <br /> CROSS SECTION OUTPUT Profile#10-yr <br /> E.G. Elev (ft) 4685.29 Element Left OB Channel Right OB <br /> Vel Head (ft) 0.54 Wt. n-Val. 0.040 0.035 0.040 <br /> W.S. Elev (ft) 4684.74 Reach Len. (ft) 1017.00 1017.00 1017.00 <br /> Crit W.S. (ft) 4683.91 Flow Area (sq ft) 434.52 928.10 129.05 <br /> E.G. Slope (ft/ft) 0.005087 Area (sq ft) 434.52 928.10 129.05 <br /> Q Total (cfs) 8500.00 Flow (cfs) 2511.64 5676.50 311.86 <br /> Top Width(ft) 605.34 Top Width(ft) 134.00 323.23 148.11 <br /> Vel Total (ft/s) 5.70 Avg. Vel. (ft/s) 5.78 6.12 2.42 <br /> Max Chl Dpth (ft) 5.74 Hydr. Depth(ft) 3.24 2.87 0.87 <br /> Conv. Total (cfs) 119180.8 Conv. (cfs) 35216.5 79591.7 4372.6 <br /> Length Wtd. (ft) 10 17.00 Wetted Per. (ft) 134.84 323.28 148.15 <br /> Min Ch El (ft) 4679.00 Shear(lb/sq ft) 1.02 0.91 0.28 <br /> Alpha 1.08 Stream Power(lb/ft s) 5.92 5.58 0.67 <br /> Fran Loss (ft) 1.52 Cum Volume (acre-ft) 90.18 80.77 9.24 <br /> C & E Loss (ft) 0.13 Cum SA(acres) 33.37 19.35 6.90 <br /> Warning: Divided flow computed for this cross-section. <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 /> pg. 48 <br />