§ 156.067  STANDARDS FOR SUBDIVISION PROPOSALS.
   (a)   All subdivision proposals including the placement of manufactured home parks and subdivisions shall be consistent with provisions of this chapter.
      (1)   Preliminary plans and development engineering plans shall include the special flood hazard area and drainage data as required by engineering design standards.
      (2)   Residential building lots shall be provided with adequate buildable area outside the floodway.
      (3)   Streets and sidewalks shall be designed to minimize potential for increasing or aggravating flood levels.
   (b)   All proposals for the development of subdivisions including the placement of manufactured home parks and subdivisions shall meet floodplain development permit requirements of §§ 156.032, 156.052, and 156.065 through 156.068.
   (c)   Base flood elevation data shall be determined and shown on subdivision proposals and other proposed development including the placement of manufactured home parks and subdivisions which are greater than 50 lots or five acres, whichever is lesser.
   (d)   (1)   All subdivision proposals including the placement of manufactured home parks and subdivisions shall have adequate drainage provided to reduce exposure to flood hazards.
      (2)   Residential subdivisions outside areas of special flood hazards for lots platted after August 25, 2016. For areas located within 100 feet of a special flood hazard area, the following minimum requirements shall apply to construction of residential structures:
         A.   The minimum setback distance from the edge of a flood hazard area to the nearest wall of a basement shall be 20 feet;
         B.   The lowest floor level elevation (including basement) shall be no more than five feet below the closest adjacent base flood elevation;
         C.   The lowest opening shall be no less than one foot above the base flood elevation;
         D.   Additional requirements in conformance with the provisions of FEMA/FIA-Technical Bulletin 10-01 may be required to ensure that a structure is reasonably safe from flooding.
   (e)   All subdivision proposals including the placement of 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)    Any subdivision proposals along any regulated floodplain are required to determine the BFE through a study or best available data through FEMA and provide that information with the first subdivision submittals.
   (g)   Base flood elevation data shall be provided for all subdivision proposals where a flood hazard exists as illustrated on a floodplain map (FIRM map or best available information data). The property owner(s) or designated representatives of any subdivision which proposes changes to the 100-year floodplain limits shall have a licensed professional prepare, request the city to sign a community acknowledgment form, and submit for a conditional Letter of Map Change directly to the Federal Emergency Management Agency (FEMA). Building permits for any areas of the subdivision affected by proposed changes shall not be approved by the city prior to acceptance of the Letter of Map Change by FEMA. Upon verification of the FEMA acceptance, the city floodplain administrator shall issue a floodplain development permit.
(1992 Code, § 45-21)  (Ord. 70-09, passed 8-3-2009; Ord. 94-16, passed 8-2-2016; Ord. 78-17, passed 8-15-2017; Ord. 77-21, passed 7-6-2021)