Chapter 18.26, Sections 18.26.030-18.26.060

Other

• Anchoring of structures

  All new construction and substantial improvements shall be adequately anchored to prevent flotation, collapse, or lateral movement of the structure resulting from hydrodynamic and hydrostatic loads, including the effects of buoyancy.

• AO zone elevation above highest adjacent grade2 ft

  In an AO zone, elevated above the highest adjacent grade to a height equal to or exceeding the depth number specified in feet on the FIRM, or elevated at least two feet above the highest adjacent grade if no depth number is specified.

• Development permit required

  A development permit shall be obtained before any construction or other development begins within any area of special flood hazard.

• Minimum openings for enclosed areas below lowest floor1 sq in per sq ftsq ftSquare feet. An acre is 43,560 sq ft; a typical suburban lot is 7,000–10,000.

  Have a minimum of two openings with a total net area of not less than one square inch for every square foot of enclosed area subject to flooding. The bottom of all openings shall be no higher than one foot above grade.

• FillGrading (cut & fill)Reshaping land by removing earth (cut) or adding it (fill), often capped by volume. compaction requirement95 pct

  For foundations placed on fill, the location and height of fill, and compaction requirements (compacted to ninety-five (95) percent using the Standard Proctor Test method).

• Flood-resistant materials

  All new construction and substantial improvements shall be constructed with flood-resistant materials as specified in FEMA Technical Bulletin TB2-93, and utility equipment resistant to flood damage.

• Floodway encroachment prohibition

  Prohibit encroachments, including fill, new construction, substantial improvement, and other new development unless certification by a registered professional engineer or architect is provided demonstrating that encroachments shall not result in any increase in the base flood elevation during the occurrence of the base flood discharge.

• Manufactured homeManufactured homeA dwelling built in a factory to a federal standard and transported to the site. elevation

  All manufactured homes shall be elevated on a permanent foundation so that the lowest floor is elevated to or above the base flood elevation.

• Manufactured homeManufactured homeA dwelling built in a factory to a federal standard and transported to the site. pier heightMaximum heightThe tallest a building may be, given in feet, in storeys, or both — whichever binds first. in existing parks36 in

  The manufactured home chassis is supported by reinforced piers or other foundation elements of at least equivalent strength that are no less than 36 inches in height above grade.

• Nonresidential floodproofing

  Nonresidential construction shall either be elevated to conform with residential standards or be floodproofed below the elevation recommended so that the structure is watertight with walls substantially impermeable to the passage of water.

• Residential lowest floor elevation

  New or substantial improvements, shall have the lowest floor, including the basement, elevated to or above the base flood elevation.

• Recreational vehicle temporary stay180 days

  All recreational vehicles placed on sites within Zones A, AO, AH, and AE shall either be on the site for fewer than 180 consecutive days and be fully licensed and ready for highway use, or meet the permit requirements and elevation and anchoring requirements for manufactured homes.

• Subdivision floodplainFloodplainLand expected to flood at a stated frequency, where building carries extra conditions. identification

  All preliminary subdivision maps/plans shall identify the special flood hazard area and the elevation of the base flood.

• Utility design to minimize flood damage

  All new and replacement water supply and sanitary sewage systems shall be designed to minimize or eliminate infiltration of floodwaters into the systems and discharge from the systems into floodwaters.

• VarianceVariancePermission to depart from a specific dimensional rule, granted on a showing of hardship. parcel size limit0.5 acreacre43,560 square feet — about the size of an American football field without the end zones.

  Variances may be issued for new construction, substantial improvements, and other proposed new development to be erected on a parcel of one-half acre or less in size contiguous to and surrounded by parcels with existing structures constructed below the base flood level.