(a) No modification or addition shall be allowed to any nonconforming structure or any structure with a nonconforming use unless such mo.difications or addition has been granted a permit or variance by the municipality, and meets the requirements of Section 13-2-42 except where Subsection (b) below is applicable.
(b) Where compliance with the provisions of Subsection (a) above would result in unnecessary hardship and only where the structure will not be used for human habitation or be associated with a high flood damage potential, the Zoning Board of Appeals, using the procedures established in Section 13-2-70, may grant a variance from those provisions of Subsection (a) for modifications or additions, using the criteria listed below. Modifications or additions which are protected to elevations lower than the flood protection elevation may be permitted if:
(1) No floor is allowed below the regional flood elevation for residential or commercial structures;
(2) Human lives are not endangered;
(3) Public facilities, such as water or sewer, will not be installed;
(4) Flood depths will not exceed two (2) feet;
(5) Flood velocities will not exceed two (2) feet per second; and
(6) The structure will not be used for storage of materials as described in Section 13-2-42(f).
(c) All new private sewage disposal systems, or addition to, replacement, repair or maintenance of a private sewage disposal system shall meet all the applicable provisions of all local ordinances, Section 13-2-75(c), and SPS 383, Wis. Adm. Code.
(d) All new wells, or addition to, replacement, repair or maintenance of a well shall meet the applicable provisions of this Chapter, Section 13-2-75(c), and NR 811 and NR 812, Wis. Adm. Code.