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<br />COMPLIANCE WITH CWCR TECHNICAL STANDARDS <br />WHEREAS, the 100-year flow for certain stream reaches within Park County may be <br />estimated by utilizing the regression equation within the Mountains Region, as set forth in the latest <br />USGS publication entitled "Analysis of the Magnitude and Frequency of Floods in Colorado", <br />providing that the stream's drainage area falls within the applicable range for the regression <br />equation; and <br /> <br />WHEREAS, the approximate floodplain delineations contained on said maps for the' <br />unincorporated portions of Park County that meet the requirements of said USGS regression' <br />equations also meet the requirements for approximate information listed under the Board's "Rules <br />and Regulations for the Designation and Approval of Floodplains and of Storm or Floodwater <br />Runoff Channels in Colorado" (2 CCR 408-1); and <br /> <br />WHEREAS, a procedure for determining approximate hydrology information in Park <br />County for approximate floodplains oflakes, ponds, local storm drainage areas, and overflows from <br />irrigation ditches and canals has not been established by the CWCB; and those floodplain areas <br />may not be designated as approximate floodplain information without a procedure for estimating <br />I DO-year peak flows, and therefore the local government should require that a detailed hydrologic <br />and hydraulic study be performed by a professional engineer and submitted by the developer or the <br />development proponent prior to any floodplain development in those cases; and <br /> <br />WHEREAS, hydraulic determinations for the approximate floodplains listed in Table I <br />were prepared by the FIA using approximate hydraulic techniques approved under the Board's <br />"Rules and Regulations for the Designation and Approval of Floodplains and of Storm or <br />Floodwater Runoff Channels in Colorado" (2 CCR 408-1); and <br /> <br />WHEREAS, the regulation of floodplains by Park County should take place on a case-by- <br />case basis following the procedures developed by Colorado Water Conservation Board staff as <br />outlined in Table 2: <br /> <br /> Are regional regression equations' Hydrologic ,Hydraulic " <br />Type of development ' applicable to the stream of reqldrements requireme~ts '," <br />proposal in.community interest? for, developer for developer ", <br />Limited development Yes Approximate Approximate <br />Limited development No Detailed Approximate <br />Significant development Yes Detailed Detailed <br />Significant development No Detailed Detailed <br /> <br />Table 2 <br />CWCR procedure for regulating approximate Zone A floodplains <br />