Ordinance No. 20224 - Laserfiche WebLink

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minim or eliminate infiltration of flood waters into the system; 2. New and replacement sanitary sewage systems shall be designed to g � mini a ze or eliminate infiltration of flood waters into the systems and discharge from the systems into flood waters; and, 3. On --site waste disposal systems shall be located to avoid impairment to them or contamination from them during flooding. (d) Subdivision proposals 1. All subdivision proposals shall: a. Be consistent with the need to minimize flood damage; b. Have public utilities and facilities such as sewer, gas, electrical, and water systems located and constructed to minimize flood damage; and c. Have adequate drainage provided to reduce exposure to flood damage; and 2. where base flood elevation data has not been provided or is not available from another authoritative source, it shall be generated for subdivision proposals and other proposed developments which contain at least 50 lots or five acres (whichever is less). (e) Review of develppment permits where elevation data is not available either through the Flood Insurance Study or from another authoritative source, applications for development permits shall be reviewed to assure that proposed construction will be reasonably safe from flooding. The test of reasonableness is a local judgment and includes use of historical data, high water marks, photographs of past flooding, etc., where available. Failure to elevate at least two feet above grade in these zones may result in higher insurance rates. (2) Specific standards. In all areas of special flood hazards where base flood elevation data has been provided as required in subsections 9.6707(1) or (2), the following provisions are required: (a) Residential construction 1. New construction and substantial improvement of any residential structure shall have the lowest floor, including basement, elevated to or above base flood elevation. 2. Fully enclosed areas below the lowest floor that are subject to flooding are prohibited, or shall be designed to automatically equalize hydrostatic flood forces on exterior walls by allowing for the entry and exit of floodwaters. Designs for meeting this requirement must either be certified by a registered professional engineer or architect or must meet or exceed the following minim criteria: a. A minimum of two openings having a total net area of not less than one square inch for every square foot of enclosed area subject to flooding shall be provided. b. The bottom of all openings shall be no higher than one foot above Ordinance - 257