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hydrologic and hydraulic analysis, conducted by a registered profes- <br />sional engineer, demonstrating that the proposed development would not <br />result in any increase in the base flood elevation; or <br />B. Development in floodway areas causing increases in the base flood <br />elevation may be permitted provided all of the following are completed <br />by the applicant: <br />1. Meet the requirements to submit technical data in Section <br />1308.20(a); <br />2. An evaluation of alternatives, which would not result in increased <br />base flood elevations and an explanation why these alternatives are not <br />feasible; <br />3. Certification that no structures are located in areas that would be <br />impacted by the increased base flood elevation; <br />4. Documentation of individual legal notices to all impacted property <br />owners within and outside the community, explaining the impact of the <br />proposed action on their property; and <br />5. Concurrence of the Mayor of the City of Lakewood and the Chief <br />Executive Officer of any other communities impacted by the proposed <br />actions. <br />(2) Development in riverine areas with base flood elevations but no <br />floodways. <br />A. In riverine special flood hazard areas identified by FEMA where <br />base flood elevation data are provided but no floodways have been des- <br />ignated, the cumulative effect of any proposed development, when com- <br />bined with all other existing and anticipated development, shall not in- <br />crease the base flood elevation more than 1.0 (one) foot at any point. <br />Prior to issuance of a floodplain development permit, the applicant must <br />submit a hydrologic and hydraulic analysis, conducted by a registered <br />professional engineer, demonstrating that this standard has been met; or, <br />B. Development in riverine special flood hazard areas identified by <br />FEMA where base flood elevation data are provided but no floodways <br />have been designated causing more than one foot increase in the base <br />flood elevation may be permitted provided all of the following are com- <br />pleted by the applicant: <br />1. An evaluation of alternatives which would result in an increase of <br />one foot or less of the base flood elevation and an explanation why these <br />alternatives are not feasible; <br />2. Section 1308.23(i)(1)B., items 1. and 3. - 5. <br />(3) Alterations of a watercourse. For the purpose of these regulations, <br />a watercourse is altered when any change occurs within its banks. The <br />extent of the banks shall be established by a field determination of the <br />" bankfull stage." The field determination of "bankfull stage" shall be <br />based on methods presented in Chapter 7 of the USDA Forest Service <br />General Technical Report RM -245, Stream Channel Reference Sites: An <br />Illustrated Guide to Field Technique or other applicable publication <br />available from a Federal, State, or other authoritative source. For all pro- <br />posed developments that alter a watercourse, the following standards ap- <br />ply: <br />A. The bankfull flood carrying capacity of the altered or relocated por- <br />tion of the watercourse shall not be diminished. Prior to the issuance of <br />a floodplain development permit, the applicant must submit a description <br />of the extent to which any watercourse will be altered or relocated as a <br />result of the proposed development, and certification by a registered pro- <br />fessional engineer that the bankfull flood carrying capacity of the water- <br />course will not be diminished. <br />17 <br />