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flood plain of the Indian River, an equal volume of storage capacity must be created for any volume of the regulatory flood that would be displaced by fill or structures below elevation 4.0 ft. NGVD or the 10 -year Flood elevation which has been determined by FEMA, whichever is greater. (2) The velocity of the regulatory flood must not be adversely altered on any watercourse. (3) All structures, including buried storage tanks, must be anchored as necessary to resist flotation, lateral forces and the impact of floating debris. (4) No development will be allowed that poses a significant threat of releasing harmful quantities of pollutants to surface waters or groundwaters during flood- ing. (5) The Flood Protection Elevation shall be set for each project at the elevation of the regulatory flood plus one foot. In Coastal High Hazard Zones, the Flood Pro- tection Elevation shall be established with consideration given to wind -drive wave action. All construction within the Indian River County Coastal Zone shall be in compliance with the County's current Coastal Construction Code. (6) Residential buildings must have the lowest floor elevated to the Flood Protection Elevation for that site. If fill is used for foundation support, the elevation of the soil support shall not be greater than that which would result from the erosion reasonably anticipated as a result of the design storm conditions. (7) Industrial, commercial or other non-residential buildings must have the lowest floor elevated to the Flood Protection Elevation or be flood -proofed as follows: (a) A Florida registered Professional Engineer or Architect must certify that the building has been designed and constructed so that below the Flood Protection Ele- vation, the structure and attendant utility facilities are watertight and capable of resisting the effects of the regulatory flood. The design must take into account flood velocities, duration, rate of rise, hydrostatic and hydro- dynamic forces, the effect of buoyancy, scour, erosion, and impacts from debris. (b) Flood -proofing measures must be operable without human intervention and without an outside source of electricity. (8) Accessory buildings may be constructed below the Flood Protection Elevation provided there is minimal poten- tial for significant damage by flooding. (9) Sewage treatment and potable water supply systems must be designed and located to prevent inflow or