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STATE OF COLORADO Colorado Water Conservation Board Department of Natural Resources 1313 Sherman Su'eet, Room 721 Denyer, Colorado 80203 Phone: (303) 866-3+!1 FAX: (303) 866-+!7-! www.cwcb.state.co.us Bill Ritter, II. Goyernor MEMORANDUM Ranis D. Sherman Executive Director TO: Colorado Water Conservation Board Members Dan McAuliffe Acting Director FROM: Kevin Houck, P.E., Flood Protection Section DA TE: September 4, 2007 SUBJECT: Consent Agenda Items 2.a through 2.e September 18-19,2007 Board Meeting Designation and Approval of 100- Year Flood plain Information SUMMARY Consent Agenda Items 2.a through 2.e include five 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 Regulatory Floodplains 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 mnoff channel or basin only after designation and approval by the CWCB. In addition, Section 37-60-106(1 )( c), Colorado Revised Statutes, directs the CWCB to designate and approve storm or floodwater mnoff channels or basins and to make such designations available to legislative bodies of local jurisdictions. 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 floodplain (hazard delineation) without water surface profiles. CWCB staff performs technical reviews on the following types of reports and maps for approval and designation by the Board: