NR 116.15(3)(d) (d) All new private sewage systems, or additions to, maintenance, repair or replacement of a private sewage system, in a floodfringe area shall meet the applicable requirements of all municipal ordinances and ch. SPS 383.

NR 116.15(3)(e) (e) All new wells, or additions to, replacement, repair or maintenance of a well, in a floodfringe area shall meet the applicable provisions of the floodplain zoning ordinance and chs. NR 811 and 812.

NR 116.15(4) (4) Shallow depth flooding area. No structural repairs, modifications or additions to an existing building, the cost of which exceeds, over the life of the existing building, 50% of its present equalized assessed value, may be allowed in a shallow depth flooding area unless the entire building is permanently changed to conform with the standards prescribed in s. NR 116.14 (1).

NR 116.15(5) (5) Flood storage area. No structural repairs, modifications or additions to an existing building, the cost of which exceeds, over the life of the existing building, 50% of its present equalized assessed value, may be allowed in a flood storage area unless the entire building is permanently changed to conform with the standards prescribed in s. NR 116.14 (2).

NR 116.15(6) (6) Coastal floodplain area. No structural repairs, modifications or additions to an existing building, the cost of which exceeds, over the life of the existing building, 50% of its present equalized assessed value, may be allowed in a coastal floodplain area unless the entire building is permanently changed to conform with the standards prescribed in s. NR 116.14 (3).

NR 116.15(7) (7) Municipal responsibilities.

NR 116.15(7)(a) (a) Municipal floodplain zoning ordinances shall regulate nonconforming uses and nonconforming buildings in a manner consistent with this section and the applicable state statutes. These regulations shall apply to the modification or addition of any building or to the extension of the use of any building or premises which was lawful before the passage of the floodplain zoning ordinance or any amendment thereto.

NR 116.15(7)(b) (b) As permit applications are received for modifications or additions to nonconforming buildings in the floodplain, municipalities shall develop a list of those nonconforming buildings, their present equalized assessed value and a list of the costs of those activities associated with changes to those buildings enumerated in sub. (2) (a) or (3) (a), (b) and (c).

NR 116.15 History History: Cr. Register, February, 1986, No. 362, eff. 3-1-86; correction in (2) (c) and (3) (e) made under s. 13.93 (2m) (b) 7., Stats., Register, September, 1995, No. 477; correction in (1) (intro.) was made under s. 13.93 (2m) (b) 7., Stats., Register July 2001, No. 547; CR 03-064: am. (1) (c) Register April 2004 No. 580, eff. 5-1-04; CR 03-091: am. (1) (a), cr. (1) (am) and (as), Register August 2004 No. 584, eff. 9-1-04; corrections in (2) (b), (3) (d) made under s. 13.92 (4) (b) 7., Stats., Register January 2012 No. 673.

NR 116.16 NR 116.16 Floodproofing.

NR 116.16(1) (1) General standards. When floodproofing measures are required by either a municipal floodplain zoning ordinance or some other regulation which incorporates by reference the floodproofing requirements of this chapter, such measures shall be designed to withstand the flood depths, pressures, velocities, impact and uplift forces and other factors associated with the regional flood, to assure that the structures are watertight and completely dry to the flood protection elevation without human intervention during flooding.

NR 116.16(2) (2) Certification.

NR 116.16(2)(a) (a) Whenever floodproofing measures are required, a registered professional engineer or architect shall certify that the following floodproofing measures will be utilized, where appropriate, and are adequate to withstand the flood depths, pressures, velocities, impact and uplift forces and other factors associated with the regional flood:

NR 116.16(2)(a)1. 1. Anchorage of structures, or addition of mass or weight to structures, to prevent flotation.

NR 116.16(2)(a)2. 2. Reinforcement of walls and floors to resist rupture or collapse caused by water pressures or floating debris.

NR 116.16(2)(a)3. 3. Construction of wells, water supply systems and waste treatment systems so as to prevent the entrance of flood waters into such systems.

NR 116.16(2)(a)4. 4. Subsurface drainage systems to relieve external pressures on foundation walls and basement floors.

NR 116.16(2)(a)5. 5. Cutoff valves on sewer lines or the elimination of gravity flow basement drains.

NR 116.16(2)(a)6. 6. Placement of essential utilities above the flood protection elevation.

NR 116.16(2)(b) (b) Whenever floodproofing measures are required, a permit, special exception, conditional use or variance may not be issued until the certification required in par. (a) is submitted to the municipal zoning administrator.

NR 116.16 History History: Cr. Register, February, 1986, No. 362, eff. 3-1-86.

NR 116.17 NR 116.17 Levees, floodwalls and channel improvements.

NR 116.17(1) (1) General. The following standards shall apply to municipal floodplain zoning regulations for areas landward of levees, floodwalls and channel improvements.

NR 116.17(2) (2) Levees or floodwalls.

NR 116.17(2)(a) (a) A levee or floodwall shall be considered adequate if all of the following criteria and the requirements of par. (b) are met:

NR 116.17(2)(a)1. 1. The minimum top elevation of the levee or floodwall shall be calculated using whichever of the following provides the greater protection from floods:

NR 116.17(2)(a)1.a. a. The profile of the regional flood with that regional flood confined riverward of the proposed levee or floodwall, plus 3 feet of freeboard; or

NR 116.17(2)(a)1.b. b. The standard project flood and/or the 500 year flood confined riverward of the proposed levee or floodwall.

NR 116.17(2)(a)1.c. c. Exceptions to the standards in subd. 1. a. and b. may be granted by the department on a case-by-case basis for levees and floodwalls not used to protect human life.