22-19 - Amend Chapter 1308 flood damage prevention following FEMA flood zone update - ordinance

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v. Concurrence of the Mayor of Lakewood and the Chief Executive Officer of any other communities impacted by the proposed actions. (2) Development in Riverine Areas with Base Flood Elevations but No F000dways. A. In riverine special flood hazard areas identified by FEMA where base flood elevation data are provided but no floodways have been des- ignated, the cumulative effect of any proposed development, when com- bined with all other existing and anticipated development, shall not in- crease the base flood elevation more than 1.0 (one) foot at any point. Prior to issuance of a floodplain development permit, the applicant must submit a hydrologic and hydraulic analysis, conducted by a registered professional engineer, demonstrating that this standard has been met; or, B. Development in riverine special flood hazard areas identified by FEMA where base flood elevation data are provided but no floodways have been designated causing more than one foot increase in the base flood elevation may be permitted provided all of the following are com- pleted by the applicant: i. An evaluation of alternatives which would result in an increase of one foot or less of the base flood elevation and an explanation why these alternatives are not feasible; ii. Subsection (i)(I)B(i) and (iii) -(v) of this section. (3) Alterations of a Watercourse. For the purpose of these regulations, a watercourse is altered when any change occurs within its banks. The extent of the banks shall be established by a field determination of the "bankfull stage." The field determination of "bankfull stage" shall be based on methods presented in Chapter 7 of the USDA Forest Service General Technical Report PM-245, Stream Channel Reference Sites: An Illustrated Guide to Field Technique or other applicable publication available from a Federal, State, or other authoritative source. For all pro- posed developments that alter a watercourse, the following standards ap- ply: A. The bankfull flood carrying capacity of the altered or relocated por- tion of the watercourse shall not be diminished. Prior to the issuance of a floodplain development permit, the applicant must submit a description of the extent to which any watercourse will be altered or relocated as a result of the proposed development, and certification by a registered pro- fessional engineer that the bankfull flood carrying capacity of the water- course will not be diminished. B. Adjacent communities, the U.S. Army Corps of Engineers, and the Ohio Department of Natural Resources, Division of Water, must be no- tified prior to any alteration or relocation of a watercourse. Evidence of such notification must be submitted to the Federal Emergency Manage- ment Agency. C. The applicant shall be responsible for providing the necessary maintenance for the altered or relocated portion of said watercourse so that the flood carrying capacity will not be diminished. The Floodplain Administrator may require the permit holder to enter into an agreement with Lakewood specifying the maintenance responsibilities. If an agree- ment is required, it shall be made a condition of the floodplain develop- ment permit. D. The applicant shall meet the requirements to submit technical data in subsection (k)(1)A.iii of Section 1308.03 when an alteration of a wa- tercourse results in the relocation or elimination of the special flood haz- ard area, including the placement of culverts. 0) Development standards for coastal high hazard areas and MoWA areas. The requirements of this subsection 0) apply to development in 38