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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />sediment transport and deposition upstream (west) of the U.S. Highway 50 Bridge at Las Animas <br />from flooding that occurred during spring 1999 (Aerial Photograph 5). The straightened channel <br />increases river flow velocity. Once past the 4-mile straight channel, flood flows spread out <br />across the floodplain, slowing and depositing sediment into Channel Problem Area No.3 (Aerial <br />Photograph 6). Problems in Channel Problem Area No.3 can also be attributed to the dense salt <br />cedar stands that constrict the river channel and slow the flood flows causing sediment <br />deposition. Problems also arise from floodwater that is stored temporarily above the <br />conservation pool storage levels at John Martin Reservoir. At these higher than normal reservoir <br />levels, the reservoir pool backs up the river channel and tends to slow flood water movement <br />through Channel Problem Area No.3, preventing the attendant sediment from reaching the <br />reservoir proper (USACE 1999d). <br /> <br />, <br /> <br />51 <br />