Sec. 27-92

Floodplain

• Maximum accessoryAccessory useA secondary activity customarily incidental to the main use of the lot — a garage, a home office. structure area600 sqftsq ftSquare feet. An acre is 43,560 sq ft; a typical suburban lot is 7,000–10,000.

  No variance shall be granted for an accessory structure exceeding six hundred (600) square feet.

• Floodway encroachment

  Within any floodway area, no encroachments, including fill, new construction, substantial improvements, or other development shall be permitted unless it has been demonstrated through hydrologic and hydraulic analysis performed in accordance with standard engineering practice that the proposed encroachment will not result in any increase in flood levels within the community during the occurrence of the base flood discharge.

• Lowest floor elevation

  New construction and substantial improvements of any structure within special flood hazard areas shall have the lowest floor (including basement) 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. anchoring and elevation

  Manufactured homes shall be anchored to prevent flotation, collapse, or lateral movement, and shall be elevated so that the lowest floor is at or above the base flood elevation.

• Sanitary sewage system design

  New and replacement sanitary sewage systems shall be designed to minimize or eliminate infiltration of flood waters into the systems and discharges from the systems into flood waters.

• Base flood elevation data for subdivisions

  Base flood elevation data shall be provided for subdivision proposals and other proposed developments containing at least 50 lots or 5 acres, whichever is less.

• Subdivision drainage

  All subdivision proposals shall have adequate drainage provided to reduce exposure to flood damage.

• Subdivision utilities

  All subdivision proposals shall have public utilities and facilities such as sewer, gas, electrical, and water systems located and constructed to minimize or eliminate flood damage.

• Substantial damage compliance

  Any structure that has been substantially damaged shall be brought into compliance with the provisions of this article.

• Substantial improvement compliance

  Any repair, reconstruction, or improvement to an existing structure that constitutes a substantial improvement shall require full compliance with the provisions of this article.

• VarianceVariancePermission to depart from a specific dimensional rule, granted on a showing of hardship. minimum necessary

  Variances shall be issued only after the board of zoning appeals has determined that the variance will be the minimum required to provide relief.

• VarianceVariancePermission to depart from a specific dimensional rule, granted on a showing of hardship. notification

  The board of zoning appeals shall notify the applicant for a variance, in writing that the issuance of a variance to construct a structure below the one (1) percent chance flood elevation (a) increases the risks to life and property and (b) will result in increased premium rates for flood insurance.

• VarianceVariancePermission to depart from a specific dimensional rule, granted on a showing of hardship. prohibitedProhibitedNot allowed in the district at all, short of rezoning or a variance. criteria

  Variances shall not be issued where the variance would result in increased flood heights, additional threats to public safety, extraordinary public expense, create nuisances, cause fraud on or victimization of the public, or conflict with existing local laws or ordinances.

• On-site waste disposal system location

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

• Water supply system design

  New and replacement water supply systems shall be designed to minimize or eliminate infiltration of flood waters into the systems.

• Zone AO lowest floor elevation

  For buildings located in Zone AO, the elevation of the lowest floor shall be at least one foot above the depth number specified on the FIRM, or at least two feet above the highest adjacent grade if no depth number is specified.