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<br />721 State Centennial Building <br />1313 Sherman Street <br />Denver, Colorado 80203 <br />Phone: (303) 866-3441 <br /> <br />STATE ~OF COLORADO <br /> <br />~ <br /> <br />COLORADO WATER CONSERVATION BOARD <br /> <br />Departnlent 01 I\dtllfdl RC'~()lJr( C''' <br /> <br />October 3, 1985 <br /> <br />Richard D, lamm <br />Governor <br />J. William McDonald <br />Director <br />David W. Wa!k.f'f <br />Of'puty Dlrf'ctor <br /> <br />william D. Hamann, P. E. <br />Westwater Engineering <br />502 W. 8th Street <br />P. O. Box 1470 <br />Palisade, CO 81526 <br /> <br />Dear ylr. Hamann: <br /> <br />Enclosed is a copy of the field survey profiles for the Lake <br />City, Colorado flood control levee project. As we discussed, the <br />engineering services requested by Town/County is to prepare a <br />feasibility investigtion for a levee proejct on Henson Creek <br />upstream of the Highway No. 149 bridge for a distance of 1000 <br />feet. <br /> <br />The design standards for levees are: <br /> <br />1. For a distance of 100 feet upstream from Highway No. <br />149 b~idge, the top of levee must have a 4 foot <br />freeboard above the lOa-year flood water surface level. <br /> <br />2. The remainder of the levee system must have a 3 foot <br />freeboard above the 100-year flood water surface level. <br /> <br />3. As minimum, we recommend a 8 foot top width; 1 on 3 <br />side slopes for grass cover; 1 on 1 side slope for rock <br />rip-rap; and no decrease in channel conveyance for the <br />existing channel. <br /> <br />I for see a final report consisting of 2-3 pages of <br />introductory text, plan-profile plate, and quantity-cost summary <br />table. <br /> <br />732 <br />sur/prof <br />