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Section 12-1/2-5. Floodproofing; definition of. "Floodproofing," as used herein shall mean one or more structural provisions, changes, or adjustment to property to require all new construction and substantial improvements to be designed so that below the base flood level the structure is watertight with walls substantially impermeable to the passage of water and with structural components, having the capability of resisting hydrostatic and hydrod~ic loads and effects of buoyancy to eliminate flood damage to structures, contents thereof, and water and sanitary facilities. Such' measures may include but are not limited to the anchorage of structure to foundations, installation of watertight doors~ and bulkheads, reinforcement of walls to resist water pressure, the use of paints, membranes or mortars to reduce seepage of water through walls, addition of mass or weight to struct- ures to resist flotation, construction of water supply and water treatment systems to prevent the entrance of flood water use of pu/~ping facilities for subsurface drainage facilities for buildings to relieve external foundation wall and base- ment floor pressures and the installation of cutoff valves on sewer lines or elimination of gravity flow basement drains. In any case, where the adequacy of floodproofing measures shall be in issue, the building official shall determine the matter. A person aggrieved by a ruling of the building official may appeal such ruling to the board of adjustments and appeals in accordance with the provisions of Section 127.0 through 127.6 of the BOCA Basic Code of the City of Portsmouth. The building official and the board shall make their decisions in accordance with the rules, regulations and guidelines promulgated by the federal insurance administrator. Section 12-1,/2-6. Building permits in flood hazard districts required; subdivision proposals in flood hazard districts; contents of application; standards for evaluation thereof. (a} Building permits shall be obtained from the building official prior to the commencement of any proposed development including but not limited to buildings or other structures, mining, dredging, filling grading, paving, excavation or drilling operations or any substantial improvement to an existing structure in Coastal High Hazard Zone V7, Special Flood Hazard District Zones A-4 and A-7. Building permits shall be reviewed to determine whether the proposed construction: