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<br />b. Federal agencies or other recognized and qualified govemment authorities may produce <br />floodplain mapping work as a study proponent or on behalf of a study proponent. <br /> <br />Rule 7. Standards for Rel!:ulatorv Floodwavs: <br /> <br />. <br /> <br />A. Designation of floodways. Designation and approval of floodway information shall be <br />considered by reference as being within the designation and approval of corresponding 100- <br />year regulatory information. For waterways with base flood elevations for which floodways <br />are not computed, the community shall have the discretion to apply floodway regulations <br />according to its own determination, as outlined in 44 CFR 60.3( c)(1 0). <br /> <br />B. Establishment of Floodway Criteria. The CWCB recognizes that designated floodways are <br />administrative limits and tools used by communities to regulate existing and future floodplain <br />developments within their jurisdictions. Communities may choose to delineate floodways <br />based on FEMA's I-foot rise criteria or based on more strict criteria (e.g. depth and velocity <br />criteria, 0.5-footrise, etc.). The CWCB floodway rule is synonymous with communities' <br />adopted floodway criteria. Where no local floodway criteria exist, the CWCB recommends the <br />use ofthe minimum FEMA standard, <br /> <br />C. Incorporation ofFEMA's Floodway Regulations. All regulations defined in 44 CFR <br />60.3(c)(10)and 44CFR 60.3(d) are hereby incorporated by reference into this rule. All <br />communities participating in the National Flood Insurance Program that have Base Flood <br />Elevations defined for one or more of the waterways within their jurisdictions can adopt and <br />enforce these floodway regulations. Failure to enforce floodway regulations may impact the <br />community's standing in the National Flood Insurance Program and may eliminate or reduce <br />eligibility for federal or state financial assistance for flood mitigation and disaster purposes. <br /> <br />. <br /> <br />D. Communities in Which This Rule Applies. Communities with designated Regulatory <br />Floodplains that have Base Flood Elevations defined for one or more of the waterways within <br />their jurisdictions shall be required to establish a technical (quantified) criteria for floodway <br />determination and regulation. <br /> <br />Rule 8. Criteria for Determininl!: the Effects of Dams on Rel!:ulatorv Floodplains: <br />A. Flood Control Dams. If a publicly owned, operated and maintained dam is specifically <br />designed and operated either in whole or in part for flood contr~u.!Q<lsed then its <br />effects shall be taken into consideration when delineating the floodplain below such a-~~- <br />dam. The effects of the darn shall be based upon the 100-year flood under foreseeable <br />development, with full credit to be given to the diminution of peak flood discharges, <br />which would result form normal dam operating procedures. <br />B. Non-Flood Control Dams. If a darn is not specifically designed and operated, either in <br />whole or in part, for flood control purposed, then its effects, even if it provides <br />inadvertent flood routing capabilities which reduce the 100-year flood downstream, <br />shall not be taken into account and the delineation of the floodplain below such a dam <br />shall be based upon the 100-year flood that would occur absent of the dam's influence. <br />However, if adequate assurances have been obtained to preserve the flood routing <br />capabilities of such a dam, then the delineation of the floodplain below the dam may, . <br />but need not, be based on the assumption that the reservoir formed by the dam will be <br /> <br />14 <br /> <br />DRAFT <br />