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<br />Floodplains identified in the Master Drainageway Plans" in addition to those identified by FEMA <br />as federal regulatory floodplains, are administered to c:omply with or exceed the minimum <br />standards of the NFIP. Master Drainageway Plans include floodway determination using the 0.5 <br />foot criteria, except Dry Creek which uses 1.0 foot criteria, and 100,year floodplain delineation <br />using developed basin hydrology conditions. The Fossil Creek Master Drainageway Plan <br />assumes that the floodway is equal to the floodplain as a. result of the incised nature of the stream <br />and includes channel stability analyses. <br /> <br />Master Drainageway Plan floodplain delineation is based on a fully developed basin so are <br />generally more conservative than the FEMA delineation. Therefore, Master Drainageway Plans <br />are used to regulate proposed development in the floodplain. The FEMA Flood Insurance <br />Studies are used in conjunction with the Master Plans for the determination of compliance with <br />the NFIP flood insurance purchase requirements for FEMA floodplains (Cache La Poudre River, <br />Spring Creek, Dry Creek). However, for the purposes of floodplain administration in general, <br />whichever study map is more restrictive, FIRM or Master Drainage Plan, has precedence. <br /> <br />Master Drainageway Plans present floodplain information for major drainageways in the City <br />and include preliminary design of dfainage improvement facilities to eliminate or alleviate flood <br />hazard along the drainageway. Master plans are used by local officials in planning the use and <br />regliliilonof floodplain areas such that flood hazards and future damages are eliminated or <br />minimized. <br /> <br />The Master Drainageway Plans contain information on historic floods, existing factors which <br />influence the flood hazard, and the nature and extent of probable future floods. Maps delineating <br />the flooded areas for the 100,year, and in some studies the 500,year, flood boundaries, flood <br />profiles, floodplain cross,sections, and floodway identification are included. <br /> <br />The objectives of the Master Drainageway Plans are: <br /> <br />~ 1!. <br /> <br />I. To reduce the threat to human life, personal injury, or related health hazards due to <br />floods. <br /> <br />2. To reduce or prevent flood damage and maintenance requirements for public and private <br />property and facilities. <br /> <br />3. To provide sound technical basis for the management of floodplains by structural or <br />nonstructural methods. <br /> <br />4. To make effective use of public funds and to enhance and protect the value ofland and <br />property . <br /> <br />5. To formulate and evaluate alternative flood control and drainage concepts and to <br />determine the most economically feasible and practical plan for mitigating flooding. <br /> <br />21 <br />