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APPENDIX A <br /> TEMPORARY RIVER CROSSING FLOW CALCULATIONS <br /> The temporary river crossing will consist of at least seven 2-ft diameter <br /> corrugated metal culverts of approximately 30 feet long. From the enclosed <br /> chart, it can be interpolated that each culvert can pass 4.5 cubic feet/second <br /> of water with no head. The temporary river crossing will not be over 5 feet <br /> high and will contain less than 500 cubic yards of material. At less than 5 <br /> feet high, 2.5 feet of head over the culverts would be available without <br /> topping the temporary crossing. Interpolation from the chart shows that at 2.5 <br /> foot of head each culvert can pass 22.5 cubic feet/second of water. The <br /> Hydrograph at Madrid (larger flow than at Maxwell Mine) shows that during April <br /> a normal high flow of 30 cubic feet/second can be expected. <br /> Temporary Crossing Capacity @ No Head = 7 x 4.5 = 31 .5 cfs <br /> Temporary Crossing Capacity @ 2.5' Head = 7 x 22.5 = 157.5 cfs <br />