(a) No modification or addition shall be allowed to any nonconforming structure or any structure with a nonconforming use in a floodway area, unless such modification/addition:
(1) Has been granted a permit or variance which meets all Chapter requirements;
(2) Meets the requirements of Section 13-2-60;
(3) Shall not increase the obstruction to flood flows or regional flood height;
(4) Any addition to the existing structure shall be floodproofed, pursuant to Section 13-2-74, by means other than the use of fill, to the flood protection elevation; and
(5) If any part of the foundation below the flood protection elevation is enclosed, the following standards shall apply:
a. The enclosed area shall be designed by a registered architect or engineer to allow for the efficient entry and exit of flood waters without human intervention. A minimum of two (2) openings must be provided with a minimum net area of at least one square inch for every one square foot (lsq. in.: 1 sq. ft.) of the enclosed area. The lowest part of the opening can be no more than twelve (12) inches above the adjacent grade;
b. The parts of the foundation located below the flood protection elevation must be constructed of flood-resistant materials;
c. Mechanical and utility equipment must be elevated or floodproofed to or above the flood protection elevation; and
d. The use must be limited to parking, building access, or limited storage.
(b) No new on-site sewage disposal system, or addition to an existing on-site sewage disposal system, except where an addition has been ordered by a government agency to correct a hazard to public health, shall be allowed in the Floodway District. Any replacement, repair or maintenance of an existing on-site sewage disposal system in a floodway area shall meet the applicable requirements of all municipal ordinances, Section 13-2-75(c), and SPS 383, Wis. Adm. Code.
(c) No new well or modification to an existing well used to obtain potable water shall be allowed in a floodway area. Any replacement, repair or maintenance of an existing well in the floodway District shall meet the applicable requirements of all Village of Edgar ordinances, Section 13-2-75(c), and NR 811 and NR 812, Wis. Adm. Code.