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• Table 2 <br />Allen Mine <br />Drainage Structures for Undisturbed Runoff <br />Undisturbed Areas South of Mine Site <br />10-Yr Peak <br />Dimensions ;Slope Length Man. Flow ;Flow Depth Vel <br />Channel In-Flow Shape;Dep Top Botom; % Ft No. CFS CFS FT FPS <br />Dch 1B-A UD1BA Trap 2.0 12.0 0.0 3.0 720 0.04 74.6 59.9 1.8 5.9 <br />Flume D1BA Trap 1.0 2.5 1.0 30.6 120 0.011 82.4 59.9 0.8 43.4 <br />Dch 1B-B Flume Trap 3.0 8.0 0.0 2.0. 280 0.04 71.2 59.9 2.8 5.7 <br /> UD1BB Trap 4.0 12.0 0.0 0.8 640 0.04 112.0 62.7 3.2 4.0 <br />Dch 1B-C UD1BC Trap 2.0 12.0 0.0 6.7 530 0.04 111.4 7.4 0.7 4.7 <br />CMP 1 D1BB <br /> D1BC Circ 4.0 3.8 130 0.024 151.7 70.1 1.9 11.8 <br />Discharge to Purgatoire River <br />n <br />u <br />