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<br />-,-? <br /> <br />'I <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />STATE OF COLORADO <br /> <br />Colorado Water Conservation Board <br />Department of Natural Resources <br />1313 Sherman Street, Room 721 <br />Denver, Colorado 80203 <br />Phone: (303) 866-3441 <br />FAX: (303) 866-4474 <br />www.cwcb.state.co.us <br /> <br /> <br />Bill Owens <br />Governor <br /> <br />MEMORANDUM <br /> <br />GregE. Walcher <br />Executive <br />Director <br /> <br />TO: <br /> <br />Colorado Water Conservation Board Members <br /> <br />Rod Kuharich <br />Director <br /> <br />FROM: <br /> <br />Larry Lang, Chief, Flood Protection Section <br />Tom Browning, P .E., Flood Protection Section <br /> <br />Dan McAuliffe <br />Deputy Director <br /> <br />DATE: September 3, 2003 <br /> <br />SUBJECT: Consent Agenda Items 3.a and 3.b <br />September 22-23, 2003 Board Meeting <br />Floodplain Designations and Approvals <br /> <br />SUMMARY <br /> <br />Consent Agenda Items 3.a and 3.b include two floodplain studies proposed for CWCB action. Staffis <br />requesting Board designation and approval for these items. A brief summary of the studies is presented <br />below. <br /> <br />CWCB staff performs technical reviews of floodplain information to assure the Board that the <br />information is in compliance with the requirements of the CWCB's "Rules and regnlations for the <br />designation and approval of floodplains and of storm or floodwater runoff channels in Colorado," 2 <br />CCR 408-1. Furthermore, Sections 31-23-301 and 30-28-111, Colorado Revised Statutes, state that <br />legislative bodies of local jurisdictions may provide zoning regnlations for land uses on or along any <br />storm or floodwater runoff channel or basin only after designation and approval by the CWCB. In <br />addition, Section 37-60-106(1)(c), Colorado Revised Statutes, directs the CWCB to designate and <br />approve storm or floodwater runoff channels or basins and to make such designations available to <br />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 floodplain information means floodplain information prepared using topographic <br />base maps, hydrologic analyses, and hydraulic calculations to arrive 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 floodplain information prepared using a <br />