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<br />STATE OF COLORADO <br /> <br />Colorado Water Conservation Board <br /> <br />Department of Natural Resources <br />1313 Sherman Street, Room 721 <br />Denver, Colorado 8U2U3 <br />Phone: (303) 866-3441 <br />FAX: (3U3) 866-4474 <br />\Vww.cwcb.state.co. us <br /> <br /> <br />Bill Ritter, Jr. <br />Governor <br /> <br />MEMORANDUM <br /> <br />Harris D. Sherman <br />Executive Director <br /> <br />TO: <br /> <br />Colorado \Vater Conservation Board Members <br /> <br />Rod Kuharich <br />Director <br /> <br />FROM: <br /> <br />Kevin Houck, P.E., Flood Protection Section <br /> <br />Dan McAuliffe <br />Deputy Director <br /> <br />DATE: June 26, 2007 <br /> <br />SUBJECT: Consent Agenda Item 2 <br />July 11-12, 2007 Board Meeting <br />Designation and Approval of 1 OO-year Floodplain Information <br /> <br />SUMMARY <br /> <br />Consent Agenda Item 2 includes one floodplain hydrology study proposed for CWCB action. Staff is <br />requesting Board designation and approval for this item. A brief summary of the study is presented <br />below. <br /> <br />CWCB statI performs technical reVlews of floodplain infonnation to assure the Board that the <br />information is in compliance with the requirements of the CWCB's "Rules and Regulations for <br />Regulatory Floodplains in Colorado," 2 CCR 408-1. Furthermore, Sections 31-23-301 and 30-28-111, <br />Colorado Revised Statutes, state that legislative bodies of local jurisdictions may provide zoning <br />regulations for land uses on or along any storm or t100dwater runotI channel or basin only after <br />designation and approval by the CWCB. In addition, Section 37-60-106(1)(c), Colorado Revised <br />Statutes, directs the CWCB to designate and approve storm or floodwater runoff channels or basins <br />and to make such designations available to legislative bodies of local jurisdictions. <br /> <br />The CWCB's designation and approvals greatly assist local communities in meeting the statutory <br />requirements of the State and the regulatory requirements of the National Flood Insurance Program. <br />Floodplain information is broadly categorized as detailed or approximate using the following <br />definitions. Detailed t100dplain information means t100dplain information prepared using topographic <br />base maps, hydrologic analyses, and hydraulic calculations to atTive at precise water surface profiles <br />and floodplain delineations suitable for making land use decisions under statutorily authorized zoning <br />powers. Approximate floodplain information means t100dplain information prepared using a <br />significantly reduced level of detail to anive at t100dplain (hazard delineation) without water surface <br />profiles. <br />