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<br />-'. <br /> <br />, <br /> <br />121 State CenTennial Bulldlng <br />1313 Sherman Street <br />Denver, Colorado 80203 <br />Phone: (303) 866-3441 <br /> <br />STATE OF COLORI\DO <br />O. <br />J 4.' <br />, , <br /> <br />COLORADO WATER CQNSERVATlON BOARD <br />Department of Natural Resources <br /> <br />Richard D. lamm <br />,.S:.o\lernor <br /> <br />September 7, 1984 <br /> <br />J. William McDonald <br />Director <br /> <br />David w. Walker <br />Deputy Director <br /> <br />Mr. Bill Crepeau <br />Town Manager <br />P.O. Box 174 <br />Silt, CO 81652 <br /> <br />Dear Mr. Crepeau: <br /> <br />At the September 5, 1984, meeting that was called by the <br />Division of Disaster Emergency Services (DODES) regarding the <br />Town of Silt's flood losses as a result of the 1983 and 1984 <br />floods, a request was made to the Board to evaluate the flood <br />risks to the Silt reach of the Colorado River. The water <br />treatment plant which is located on an island is subject to the <br />fOllowing flood-related risks: <br /> <br />o Stream Bank Instability <br />o Flood Inundation <br />o Groundwater Infiltration <br />o Hydrostatic Forces <br />o Erosive Forces <br />o Stream Migration <br /> <br />Stream Bank Stability <br /> <br />The natural stream banks of the Colorado River throughout <br />the Silt reach are armored with grass-earthen banks, small <br />cobbles, and tree roots. The island banks have been covered with <br />sandbags which are rapidly deteriorating and will provide no <br />future bank protection. The 1984 flood completely eroded all <br />natural stream bank protection for the island, and active erosion <br />is occurring to the temporary dike system. <br /> <br />Flood Inundation <br /> <br />We used the Glenwood Springs stream gage data on the <br />Colorado River, which is located downstream of the Roaring Fork <br />River, for our hydrologic analysis. <br /> <br />716 <br />crep <br />