No permit required by the provisions of order or ordinance regulations adopted pursuant to the provisions of sections 49.600 to 49.615 shall be denied an applicant if the proposed construction, use or other development will not raise the flood elevation of the one hundred year flood level more than one foot; provided, however, that any permit may require that the lowest floor of an insurable structure shall be above the one hundred year flood level and that all structures shall be adequately anchored to prevent flotation, collapse or lateral movement of the structure.