(A) The following elevation certificates shall be submitted for any new construction or substantial improvements:
(1) Construction drawings. An elevation certificate based on “construction drawings” shall be submitted with the site and building plans as part of the floodplain development permit application;
(2) Building under construction. An elevation certificate based on “building under construction” shall be submitted to the Floodplain Administrator or the Building Official after placement of the lowest floor level prior to the construction of vertical walls. With prior approval, this elevation certificate may be based upon the lowest floor base layer, such as after a foundation has been poured, or after erection of post-style construction, or in certain situations where weather or circumstances require; and
(3) Finished construction. An elevation certificate based on “finished construction” shall be submitted to the Floodplain Administrator and Building Official prior to the final building inspection as required for issuance of building occupancy. As-built septic location must also have been verified, and grading completed.
(B) The following certificates shall be prepared by a registered professional engineer when required by the Floodplain Administrator:
(1) Designed flood opening. Elevation, design, and location of flood openings allowing for the automatic entry and exit of floodwaters in fully-enclosed areas below the base flood elevation;
(2) Floodproofing. Structure floodproofing specifications and elevations in relation to mean sea level, to which a non-residential structure will be floodproofed;
(3) No-rise. Hydraulic/hydrologic computations supporting that proposed development will result in no increase in the base flood elevation in a designated floodway, or an increase of no more than one foot in a Zone A or AE without floodway;
(4) Fill placement. Specification and confirmation of proper compaction and slope protection for fill placed in the floodplain;
(5) Manufactured home foundation. Design and confirmation of adequately-anchored home and foundation system to resist flotation, collapse, and lateral movement;
(6) TB 10-01 certification. Design specifications in accordance with the guidance provided within FEMA’s Technical Bulletin No. 10-01 related to ensuring that structures are reasonably safe from flooding and in accordance with accepted professional practices. These specifications may be prepared by a professional engineer, professional geologist, professional soil scientist, or other qualified design professional;
(7) Detention. Calculations of the increased runoff volume from development with grading and drainage plan showing the contributing areas of runoff and storage capacity above the BFE; and
(8) Compensatory storage. Calculations and plans proving the volume of flood storage by excavation or other compensatory measures are equal to the volume of floodwater storage loss due to filling in the flood hazard area. Calculations shall be made between the normal water level and the BFE and be located at or adjacent to the development site.
(Ord. 2016-34, passed 6-22-2021)