(A) City of Harker Heights.
(1) In all cases where floodplain delineation is required, its determination shall be based on the projected ultimate development of all properties contributing to the point of consideration. It is the responsibility of the developer's Engineer to determine that the ultimate developed drainage condition is based on the most accurate information available.
(2) For the purposes of this policy, any concentrated flow within a watershed that has a drainage area of 320 acres or greater, unless previously defined by FEMA, shall be delineated as a floodplain.
(3) All existing floodplains created by the base flood as computed with current, existing conditions, shall be deemed the Floodway (regulatory floodway) and shall be wholly contained within dedicated rights-of-way or easements. Encroachments are prohibited, including fill, new construction, substantial improvements and other development unless certification by a Professional Engineer is provided, demonstrating that encroachments shall not result in any increase in flood levels within the community during the occurrence of the base flood discharge.
(4) All new construction and substantial improvements of buildings (structures) shall have the lowest floor (including basement) one foot above the base flood, based upon the projected, ultimate development of all properties (without storm water detention) contributing to the point of consideration.
(5) All floodplains shall be computed utilizing the computer software and methodologies outlined in the Drainage Criteria Manual and accepted by FEMA.
(6) If land development activities are proposed which will result in flood hazard boundary delineations different from those depicted on the current Flood Insurance Rate Map (FIRM) issued by the Federal Emergency Management Agency (FEMA), the applicant for a development permit shall obtain a Conditional/Letter of Map Revision (CLOMR/LOMR) from FEMA.
(7) All floodplain delineations for FIRM revisions shall be based upon cross-sections developed in accordance with the accepted FEMA guidelines.
(B) Federal Emergency Management Agency. FEMA guidelines shall be followed.
(C) Coordination of City of Harker Heights and FEMA floodplain delineations. For all subdivisions developed adjacent to or within non-detailed designated FEMA floodplains, the applicant/ developer shall be required to provide a detailed study to determine the Base Flood Elevations (BFEs) for all lots that are adjacent or within the non-detailed area. The BFEs must be developed using approved FEMA guidelines and methods. A copy is to be furnished to the city prior to final plat.
(Ord. 2007-18, passed 6-26-07)