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\ ~ . e STATE OF COLORADO Colorado Water Conservation Board Department of Natural Resources 1313 Sherman Street, Room 721 Denver, Colorado 80203 Phone: (303) 866.3441 FAX: (303) 866-4474 www.cwcb.state.co.us Bill Owens Governor MEMORANDUM Greg E. Walcher Executive Director TO: Colorado Water Conservation Board Members FROM: Larry Lang, Chief, Flood Protection Section Tom Browning, P.E., Flood Protection Section Rod Kuharich Director Dan McAuliffe Deputy Director DATE: November 14,2002 SUBJECT: Consent Agenda Items 2a and 2b November 25-26, 2002 Board Meeting Flood Protection Section - Floodplain Information to Be Designated e SUMMARY Consent Agenda Items 2a and 2b include two floodplain studies/maps proposed for CWCB action. Staff is requesting Board designation and approval for these items. A brief summary of the studies is presented below. CWCB staff performs technical reviews of floodplain information to assure the Board that the information is in compliance with the requirements of the CWCB's "Rules and regulations for the designation and approval of floodplains and of storm or floodwater runoff channels in Colorado," 2 CCR 408-1. Furthermore, Sections 31-23-301 and 30-28-111, Colorado Revised Statutes, state that legislative bodies of local jurisdictions may provide zoning regulations for land uses on or along any storm or floodwater runoff channel or basin only after designation and approval by the CWCB. In addition, Section 37-60-l06(1)(c), Colorado Revised Statutes, directs the CWCB to designate and approve storm or floodwater runoff channels or basins and to make such designations available to legislative bodies of local jurisdictions. e The CWCB's designation and approvals greatly assist local communities in meeting the statutory requirements of the State and the regulatory requirements of the National Flood Insurance Program. Floodplain information is broadly categorized as detailed or approximate using the following definitions. Detailed floodplain information means floodplain information prepared using topographic base maps, hydrologic analyses, and hydraulic calculations to arrive at precise water surface profiles and floodplain delineations suitable for making land use decisions under statutorily authorized zoning powers. Approximate floodplain information means floodplain information prepared using a significantly reduced level of detail to arrive at a hazard delineation without water surface profiles.