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<br />< . <br /> <br />. <br /> <br />~ne Board for the conduct of floodplain studies in Colorado. In <br />addition, this latter matter is under review by the Attorney <br />General's office per the Board's earlier request. <br /> <br />The staff has concluded that the Board should, as a matter of <br />policy, designate and approve approximate floodplains if certain <br />conditions are met. It is our tentative judgment, subject to the <br />final determination of the Attorney General's staff, that the <br />Board can, in the reasonable exercise of its statutory duties and <br />authorities, adopt such a policy and, in turn, adopt standards <br />which permit the conduct of approximate floodplain studies in <br />Colorado. <br /> <br />Accordingly, the staff recommends that the Board adopt the <br />policy that it will henceforth designate and approve approximate <br />100-year floodplains subject to the conditions that: <br /> <br />1. All approximate floodplain studies shall be performed by <br />a qualified hydrologist, hydraulic engineer, or <br />registered professional engineer or firm. <br /> <br />2. All information which is presented to the CWCB for <br />designation shall be entitled, dated, and bound in an <br />individual document by community or communities. <br /> <br />. <br /> <br />3. As a minimum standard for approximate floodplain studies, <br />the 100-year discharge shall be computed for all stream <br />reaches for which the flood hazard area or zone is to be <br />delineated. <br /> <br />4. The stream hydrology shall be computed by a CWCB approved <br />method and shall be comparable in accuracy to the <br />computation of stream hydrology for a detailed floodplain <br />engineering study. <br /> <br />S. All designations and approvals of approximate 100-year <br />floodplains by the CWCB will specify that the town/city <br />or county may not exercise its zoning powers based on the <br />CWCB's designation unless it includes in its zoning <br />ordinances or regulations the requirement that there be a <br />case-by-case review and detailed hydrologic or hydraulic <br />investigation for all rezoning and development activities <br />within the approximate 100-year floodplain. <br /> <br />6. The federal government and local governments will be <br />strongly encouraged by the Board to perform detailed <br />floodplain studies, it being the strong preference of the <br />Board to base its floodplain designations and approvals on <br />detailed engineering studies to the maximum extent <br />possible. <br /> <br />/bvm <br /> <br />. <br /> <br />Attachment: as stated <br /> <br />MEMORANDUM <br /> <br />-3- <br /> <br />November 8, 1984 <br />