§ 13-03-020. Elevation and floodproofing.

(a)

Located within the areas of special flood hazards where base flood elevation data has been provided (AE/AH zones), the following provisions apply:

(1)

Residential construction. New construction and substantial improvement of any residential structure shall have the lowest floor (including basement), elevation to or above the base flood elevation. A registered professional engineer, architect, or land surveyor shall submit a certification to the floodplain administrator that the standard of this subsection as proposed in 13-02-030(a)(1), is satisfied.

(2)

Nonresidential construction. New construction and substantial improvements of any commercial, industrial or other nonresidential structure shall either have the lowest floor (including basement) elevated to or above the base flood level or, together with attendant utility and sanitary facilities, be designed so that, below the base flood level, the structure is watertight with walls substantially impermeable to the passage of water and with structural components having the capability of resisting hydrostatic and hydrodynamic loads and effects of buoyancy (floodproofed). A registered professional engineer or architect shall develop and/or review structural design, specification, and plans for the construction, and shall certify that the design and methods of construction are in accordance with accepted standards of practice as outlined in this subsection. A record of such certification which includes the specific elevation (in relation to mean sea level) to which such structures are floodproofed shall be maintained by the floodplain administrator.

(b)

Located within the areas of special flood hazard established in 13-01-050 are areas designated as shallow flooding (AO/AH Zones). These areas have special flood hazards associated with flood depths of 1 (one) to 3 (three) feet where a clearly defined channel does not exist, where the path of flooding is characterized by ponding or sheet flow; therefore, the following provisions apply:

(1)

All new construction and substantial improvements of residential structures have the lowest floor (including basement) elevated to or above the base flood elevation or the highest adjacent grade at least as high as the depth number in feet on the community's FIRM (at least three (3) feet if no depth number is specified), or

(2)

All new construction and substantial improvements of non-residential structures;

a.

Have the lowest floor (including basement) elevated to or above the base flood elevation or the highest adjacent grade at least as high as the depth number specified in feet on the community's FIRM (at least two (2) feet if no depth number is specified), or

b.

Together with attendant utility and sanitary facilities be designed so that below the base specified flood depth in an AO Zone, or below the base flood elevation in an AH Zone, the structure is watertight with walls substantially impermeable to the passage of water and with structural components having the capability of resisting hydrostatic and hydrodynamic loads of effects of buoyancy (floodproofed).

c.

A registered professional engineer or architect shall submit a certification to the floodplain administrator that the standards of this section, as proposed in 13-03-020 (c) are satisfied.

d.

Require within Zones AH or AO adequate drainage pats around structures on slopes, to guide flood waters around and away from proposed structures.

(Ord. No. 1388, 12-7-10; Ord. No. 1569 , 6-13-18)