Within the Flood Plain District, permits issued on the basis of approved plans and applications authorize only the use, arrangement, and construction set forth in such approved plans and applications and no other use, arrangement or construction. Any use, arrangement, or construction at variance with that authorized shall be deemed a violation of this chapter. The applicant shall be required to submit certification by a professional engineer or land surveyor, as appropriate, licensed in the State of Iowa, that the finished fill, structure floor elevations, floodproofing or other flood protection measures were accomplished in compliance with the provisions of this chapter, prior to the use or occupancy of any structure.