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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 /> Alpha 1.12 Stream Power(lb/ft s) 9.24 8.21 2.29 <br /> Fran Loss (ft) 1.58 Cum Volume (acre-ft) 178.70 135.58 40.44 <br /> C & E Loss (ft) 0.14 Cum SA(acres) 33.37 20.42 14.52 <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: 2034 <br /> INPUT <br /> Description: SE corner of site at river bend. <br /> Station Elevation Data num= 7 <br /> Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev <br /> 0 4683 80 4682 525 4678 560 4677 800 4680 <br /> 820 4681 1430 4693 <br /> Manning's n Values num= 3 <br /> Sta n Val Sta n Val Sta n Val <br /> 0 .04 525 .035 800 .04 <br /> Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan. <br /> 525 800 2034 2034 2034 .1 .3 <br /> Left Levee Station= 0 Elevation= 4688 <br /> CROSS SECTION OUTPUT Profile#10-yr <br /> E.G. Elev (ft) 4683.64 Element Left OB Channel Right OB <br /> Vel Head (ft) 0.13 Wt. n-Val. 0.040 0.035 0.040 <br /> W.S. Elev (ft) 4683.51 Reach Len. (ft) 2034.00 2034.00 2034.00 <br /> Crit W.S. (ft) 4680.88 Flow Area (sq ft) 1644.42 1413.63 220.80 <br /> E.G. Slope (ft/ft) 0.000705 Area (sq ft) 1644.42 1413.63 220.80 <br /> Q Total (cfs) 8500.00 Flow (cfs) 3469.72 4745.70 284.58 <br /> Top Width(ft) 947.75 Top Width(ft) 525.00 275.00 147.75 <br /> Vel Total (ft/s) 2.59 Avg. Vel. (ft/s) 2.11 3.36 1.29 <br /> Max Chl Dpth (ft) 6.51 Hydr. Depth(ft) 3.13 5.14 1.49 <br /> Conv. Total (cfs) 320144.9 Conv. (cfs) 130683.7 178742.6 10718.6 <br /> pg. 50 <br />