Section 5-3-16

Floodplain

• AO zone lowest floor elevation above highest adjacent grade2 ft

  If no flood depth number is specified, the lowest floor, including basement, shall be elevated no less than two feet above the highest adjacent grade.

• Breakaway wall design safe loading resistance20 psf

  a breakaway wall shall have a design safe loading resistance of not less than 10 and no more than 20 pounds per square foot.

• Lowest floor elevation above base flood elevation12 in

  New construction or substantial improvement of any residential structure (including manufactured homes) in Zones AE, AH, and A, shall have the lowest floor, including basement, elevated to or above the base flood level plus 12 inches.

• Subdivision proposal threshold for detailed study (acresacre43,560 square feet — about the size of an American football field without the end zones.)5 acresacre43,560 square feet — about the size of an American football field without the end zones.

  Any subdivision proposal or other proposed development (including proposals for manufactured home parks and subdivisions) that exceed 50 lots or 5 acres, whichever is less, in an area where BFE data is not available or the SFHA has not been delineated, shall include data using detailed methodologies.

• Subdivision proposal threshold for detailed study (lots)50 lots

  Any subdivision proposal or other proposed development (including proposals for manufactured home parks and subdivisions) that exceed 50 lots or 5 acres, whichever is less, in an area where BFE data is not available or the SFHA has not been delineated, shall include data using detailed methodologies.

• FillGrading (cut & fill)Reshaping land by removing earth (cut) or adding it (fill), often capped by volume. prohibition in V zones

  There shall be no fill used as structural support. When non-structural fill is proposed, appropriate engineering analyses shall be conducted to evaluate the impacts of the fill prior to issuance of a permit.