(c) Base flood elevation data for FEMA regulatory and fully developed conditions shall be generated for subdivision proposals and other proposed development, including the placement of manufactured home parks, and subdivisions which are greater than one acre, if not otherwise provided pursuant to this article.
(d) All subdivision proposals including manufactured home parks and subdivisions shall have adequate drainage provided to reduce exposure to flood hazards.
(e) All subdivision proposals including manufactured home parks and subdivisions shall have public utilities and facilities such as sewer, gas, electrical and water systems located and constructed to minimize or eliminate flood damage.
(f) Base flood elevation data shall be generated by a detailed engineering study for all Zone A areas, within 100 feet of the contour lines of Zone A areas, and other streams not mapped by FEMA, as indicated on the community's FIRM.
(g) FEMA floodplains and the city's fully developed floodplains must be mapped anywhere that the contributing drainage area is 64 acres or greater. Post-project FEMA floodplain delineations must be submitted to FEMA through the Letter of Map Change (LOMC) process, and compliant with all applicable Federal regulations. FEMA floodplains must be based upon either the FEMA current effective hydrologic model for the basin, or a new hydrologic model that reflects existing land uses with the proposed project in place. The city's fully developed floodplains must be based upon fully developed basin conditions from either a hydrologic model previously accepted by the city, or from a new hydrologic model compliant with criteria in the most current Stormwater Criteria Manual.
(h) Existing channels must not be increased or decreased from their natural state until engineering data meeting the requirements of Stormwater Management has been approved.
(i) When development is proposed in areas that do not indicate an established floodway (Zones A and AE), a licensed professional engineer shall define the regulatory floodway through hydrologic and hydraulic analyses. The Floodplain Administrator can make the determination to not require establishment of a floodway for sites where it might not be possible to designate a typical one foot flood rise floodway using the standard FEMA approved models or where one would make little practical sense.
(j) If building permits are requested for the individual lots which are shown located within the effective FEMA floodplain (not including floodway) before the LOMR to revise the FEMA floodplain to reflect the subdivision has become effective then separate Floodplain Development Permits will be required for each lot. For lots located within the effective FEMA floodway, FDPs cannot be issued until the LOMR to revise the floodway has become effective. As a condition of approval for the FDPs, an elevation certificate for the individual lot must be submitted to the city within 60 days upon completion of construction. In addition, the following conditions must be met to obtain approval of the permit:
(1) Either, the LOMR flood study must be reviewed and approved by the City and submitted to FEMA for review with the FEMA case number provided to the city; or,
(2) A preconstruction elevation certificate for the individual lot must be provided to verify the grading matches the approved plans and to confirm the structure will be built to the correct minimum finished floor elevation.
(Ord. 11998, § 1, passed 6-13-1995; Ord. 18816, § 7, passed 9-15-2009; Ord. 25350-03-2022, § 1, passed 3-8-2022, eff. 3-23-2022)