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be securely anchored to an adequately anchored foundation system in accordance with the provisions of Section 15C - 1.10 Florida Administrative Code. (11) If any lot in a residential subdivision lies within a Flood Hazard Zone, then the following additional standards apply to approval of the plat: (a) Each lot must include a site suitable for constructing a residential building in conformity with the standards of this ordinance. (b) One or more elevation benchmarks must be established and indicated on the plat. Said elevations must be referenced to the NGVD (1929) and shall be calculated to within 0.1 feet. (c) All prospective agreements for deed, purchase agreements, leases or other contracts for sale or exchange of lots within the Flood Hazard Zone and all prospective instruments conveying title to lots within the Flood Hazard Zone must carry the following flood hazard warning prominently displayed on the document: FLOOD HAZARD WARNING "This property may be subject to flooding. You should contact local building and zoning officials and obtain the latest information regarding flood elevations and restrictions on development before making plans for the use of this property." (12) All roads shall be set at or above the ten year flood elevation, but in no case shall a road be constructed at an elevation below five feet above sea level. All roads shall be designed to maintain drainage flow beneath the road bed so that equalization may occur. (13) If the development project is in a Critical Flood Zone, it must be demonstrated, in addition to compliance with Paragraphs 1 through 12, that: (a) The elevation or velocity of the regulatory flood will not be increased as a result of any obstruction or displacement of flood waters. (b) There is no significant threat of releasing quantities of pollutants which have the effect of degrading water quality below standards established in Florida Administrative Code Chapter 17-3, as amended from time to time, to surface or groundwater during the regulatory flood. (c) The capacity of the Critical Flood Zone to store and convey surface waters or perform other significant water management functions will not be impaired. (14) If the development project is in a Coastal High Hazard Zone, it must be demonstrated, in addition to compliance with Paragraphs 1 through 13, that: