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The following regulations shall apply in all special flood hazard areas.

(1) Anchoring.

(a) All new construction and substantial improvements, including those related to mobile homes, shall be anchored to prevent flotation, collapse or lateral movement of the structure resulting from hydrodynamic and hydrostatic loads, including the effects of buoyancy.

(b) All mobile homes shall be anchored to resist flotation, collapse, or lateral movement. Anchoring methods may include use of over-the-top or frame ties to ground anchors.

(2) Construction materials and methods.

(a) All new construction and substantial improvements shall use materials and utility equipment resistant to flood damage;

(b) All new construction and substantial improvements shall use methods and practices that minimize flood damage; and

(c) Electrical, heating, ventilation, plumbing, and air-conditioning equipment and other service facilities shall be designed and elevated or located so as to prevent water from entering or accumulating within the components during conditions of flooding.

(3) Utilities.

(a) All new and replacement water supply systems shall be designed to minimize or eliminate infiltration of flood waters into the system;

(b) Except as otherwise provided in this subsection, water wells are prohibited in the floodway and shall be located where not subject to ponding. However, on land designated riverway commercial farmland, upland commercial farmland, or local commercial farmland, a new or replacement water well may be located in the floodway to serve a farmhouse if designed to eliminate or minimize infiltration of flood waters into the system as required by RCW 86.16.041(3)(g) and SCC 30.65.220(7)(e).

(c) New and replacement sanitary sewage systems shall be designed to minimize or eliminate infiltration of flood waters into the systems and discharge from the systems into flood waters; and

(d) On-site waste disposal systems shall be located to avoid impairment to them or contamination from them during flooding.

(4) Enclosed area below the lowest floor. If structures or mobile homes are constructed or substantially improved with fully enclosed areas below the lowest floor, the areas shall be used solely for parking of vehicles, building access, or storage.

(5) Subdivision proposals. All subdivision, short subdivision, binding site plan, planned residential development, or rural cluster subdivision proposals shall:

(a) Be consistent with the need to minimize flood damage;

(b) Have roadways, public utilities, and other facilities such as sewer, gas, electrical, and water systems located and constructed to minimize flood damage or eliminate flood damage;

(c) Have adequate drainage provided to reduce exposure to flood damage; and

(d) Include the base flood elevation data.

(6) Watercourse alterations. The flood carrying capacity within altered or relocated portions of any watercourse shall be maintained. Prior to the approval of any alteration or relocation of a watercourse in riverine situations, the department shall notify adjacent communities and the State Department of Ecology, and submit evidence of such notification to FEMA of the proposed development. (Added by Amended Ord. 02-064, Dec. 9, 2002, Eff date Feb. 1, 2003; Amended by Ord. 20-076, Nov. 4, 2020, Eff date Nov. 27, 2020).