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<br />. LOCAL REOUEST FOR DESIGNATION <br /> <br />WHEREAS, the Colorado Water Conservation Board is the sponsor and provided funding for <br />said report dated April 26, 2001 and the CWCB staff hereby requests designation action by the Board; <br />and <br /> <br />C.RS, AUTHORITY <br /> <br />WHEREAS, Section 37-60-106(1)(c), Colorado Revised Statutes, requires the Colorado Water <br />Conservation Board to assist in the prevention of floods and flood damages therefrom; and <br /> <br />WHEREAS, Sections 31,23-301 and 30-28-111, Colorado Revised Statutes, provide that <br />legislative bodies of local jurisdictions may provide zoning regulations for land uses on or along any <br />storm or floodwater runoff channel or basin only after designation and approval by the Colorado Water <br />Conservation Board; and <br /> <br />WHEREAS, Section 37-60-106(1)(c), Colorado Revised Statutes, directs the Colorado Water <br />Conservation Board to designate and approve stOlm or floodwater runoff channels or basins and to <br />make such designations available to legislative bodies of local jurisdictions; and <br /> <br />COMPLIANCE WITH CWCB TECHNICAL STANDARDS <br /> <br />. <br /> <br />WHEREAS, the detailed 100'year flood hydrology information for North Clear Creek, Gregory <br />Gulch, and Chase Gulch, in the vicinity of Blackhawk, as presented in said report dated April 26, 2001 <br />meets all of the requirements listed under the Board's "Rules and Regulations for the Designation and <br />Approval of Floodplains and of Storm or Floodwater Runoff Channels in Colorado" (2 CCR 408-1); <br />and <br /> <br />WHEREAS, 100-year peak discharges for said streams in the vicinity of Blackhawk were <br />developed by Love and Associates using TR-20 rainfall-runoff models; and <br /> <br />WHEREAS, said rainfall-runoff models for North Clear Creek, Gregory Gulch, and Chase <br />Gulch were calibrated to 1979 flood peaks that were developed by the CWCB using graphical <br />methods; and <br /> <br />WHEREAS, the original data used for the 1979 analysis in no longer available but the <br />graphical development of the triangular hydrograph. were available for review; and <br /> <br />WHEREAS, subsequent to the 1979 analysis, two reservoirs were constructed on Chase Gulch <br />and Gregory Gulch that could attenuate flood peaks in these streams and on North Clear Creek, and the <br />affects of these reservoirs were analyzed by Love and Associates with the results presented in said <br />report dated April 26, 200 I; and <br /> <br />. <br /> <br />2 <br />