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<br />, <br /> <br />P'\DY <br />STATE OF COLORADO",., <br /> <br />COLORADO WATER CONSERVATION BOARD <br />Department of N.uural Resoufc~~ <br />B23 St.ut: CCnll:!nnl.l1 Building <br />1313 Sherm.m Street <br />Denver. Color .1UO 60203 <br />Phone: (JOJI UJ9aJ441 <br /> <br /> <br />September 16, 1981 <br /> <br />Richard D. lolmm <br />Governor <br />J. WilliJm ."lcDon.lld <br />Dirl.'r!Q( <br />O;rvid Walker <br />DeputY Direclor <br /> <br />Mr. L. William Miller <br />Rio Grande County Land Use Administrator <br />P. O. Box 396 <br />Del Norte, CO 81132 <br /> <br />Dear Mr. Miller: <br /> <br />The Colorado Water Conservat~on Board Staff has completed a <br />flood hazard review for the proposed Riverside Estates subdivision <br />located in the NW\, SE\, Section 29, Township 40 North, Range 3 <br />East, New Mexico Principal Meridian. We offer the following <br />comments for your Planning Commission's consideration. <br /> <br />I. Floodplain Information Available for Review <br /> <br />A. "Flood Hazard Study, South Fork Rio Grande and Rio <br />Grande in the vicinity of south Fork, Colorado," <br />prepared by the U.S. Department of Agriculture, <br />Soil Conservation Service in October, 1980. At <br />present this report has not been designated by <br />the Colorado Water Conservation Board. <br /> <br />II. Findings <br /> <br />A. The 100-year and 500-year floodplains for the Rio <br />Grande at Riverside Estates are identified on <br />sheet 6 of 12 ~n the SCS report. Also, the 10, 50, <br />100, and 500-year flood prOfiles for the area are <br />shown on sheet A-5e. Table 1 at the back of the <br />report gives specific information at each cross- <br />section indicated (EW through ET) . <br /> <br />B. The 100-year flood elevation at the upstream end <br />of the property is approximately 8212 feet above <br />mean sea level and 8205 feet at the downstream end. <br />Average 100~year flood depths range from 8 to 10 <br />feet. Velocities in reach will be high enough to <br />cause some bank erosion prOblems along the o~tside <br />of each bend in the river. Thus, bank erosion <br />could be a potential problem along river lots <br />1 through 9 and is potentially greatest on lots <br />1, 2, and 3. <br /> <br />COLORADO WATER CONSERVATION BOARD, Frederick V. Kroeger, Chairman <br />Robert A, Jackson. Vice Chairman. John R. Fetcher. Steamboat Springs <br />C.M. Furneaux. Walden. Floyd L, Getz, Monte Vista. Patrick A, Gormley, Grand Junction <br />Richard W, Johnston. Montrose. Davio W, Robbins, Denver. Herbert H, Vandemoer. Sterling <br />