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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 /> E.G. Slope (ft/ft) 0.003002 Area (sq ft) 2507.86 1486.12 13.52 <br /> Q Total (cfs) 24500.00 Flow(cfs) 13577.73 10894.84 27.43 <br /> Top Width(ft) 853.42 Top Width(ft) 575.00 265.00 13.42 <br /> Vel Total (ft/s) 6.11 Avg. Vel. (ft/s) 5.41 7.33 2.03 <br /> Max Chl Dpth (ft) 9.01 Hydr. Depth(ft) 4.36 5.61 1.01 <br /> Conv. Total (cfs) 447179.3 Conv. (cfs) 247823.7 198855.0 500.7 <br /> Length Wtd. (ft) Wetted Per. (ft) 578.03 265.60 13.57 <br /> Min Ch El (ft) 4674.00 Shear(lb/sq ft) 0.81 1.05 0.19 <br /> Alpha 1.07 Stream Power(lb/ft s) 4.40 7.69 0.38 <br /> Fran Loss (ft) Cum Volume (acre-ft) <br /> C & E Loss (ft) Cum SA(acres) <br /> Note: Multiple critical depths were found at this location. The critical depth with the lowest, valid, energy was used. <br /> SUMMARY OF MANNING'S N VALUES <br /> River:SPR <br /> Reach River Sta. n 1 n2 n3 <br /> Two Rivers 8880 .04 .03 .04 <br /> Two Rivers 7340 .04 .03 .04 <br /> Two Rivers 3051 .04 .035 .04 <br /> Two Rivers 2034 .04 .035 .04 <br /> Two Rivers 0 .04 .035 .04 <br /> SUMMARY OF REACH LENGTHS <br /> River: SPR <br /> Reach River Sta. Left Channel Right <br /> Two Rivers 8880 1510 1510 1510 <br /> Two Rivers 7340 4289.03 4289.03 4289.03 <br /> Two Rivers 3051 1017 1017 1017 <br /> Two Rivers 2034 2034 2034 2034 <br /> Two Rivers 0 <br /> pg. 54 <br />