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• d) Where FEMA has not established a regulatory floodway in Zone in Zones AH or AO, no Floodplain Development Permit may be issued unless a detailed engineering analysis is submitted along with the application that demonstrates the increase in base floodwater elevation due to the proposed development and all cumulative developments since the publication of the current FIRM will be less than 1 foot. e) Require adequate drainage paths around structures on slopes, to guide flood waters around and away from proposed structures. (4)In "A" Risk Zones: Special Flood Hazard Areas with no base flood elevations determined a) In Zone A, The applicant or the applicant's agent must determine a base flood elevation prior to construction. The BFE will be based on a source or method approved by the local Floodplain Administrator. b) For Residential Structures in Zone A: • 1. For all new residential structures, the top surface of the lowest floor must have an elevation 2 feet or more above the BFE. This elevation must be documented on an Elevation Certificate properly completed by a Professional Engineer, Surveyor or Architect licensed to practice in the State of Arkansas. 2. For all substantial improvements or substantial damage to existing residential structures, the entire structure becomes subject to the requirements of a new residential structure. 3. For any reconstruction, rehabilitation, addition, or other improvement to an existing residential structure that is less than a substantial improvement, only the improved area, but not the entire structure, becomes subject to the requirements of a new residential structure. c) For Nonresidential Structures in Zone A: 1. All new commercial, industrial or other nonresidential structures must either: a. have the lowest floor(including basement)elevated 2 feet or more above the base flood level or • 25