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5. (a) When that portion of a site or parcel which is proposed to be •developed lies within the FP District, A a plan for the development of the entire site Wkiek-lies-within-tke-flecd-glain shall be submitted in accord- ance with the requirements of article XIX. 9n-egplieatiea-ef-anp-eWaer-e€ gregertp-Witkia-tke-PP-Bistriet;-tke-eitp-skal€-determine-and-estab€isle-ia- tke-fie€d-en-snek-grepertp-ilea-eleclat€en-ef-ilea-benndaries-of-tke-€lead-glaia eed-fleedwaq;-es-related-te-mesa-sea-€evel---6aek-determinatien-skall-be-made witk-re€erenee-te-data-prepared-by-tke-H--6--Armp-Eergs-a€-Engineers-er-etker gnali£sed-engineering-searees;-leased-aspen-generally-aeeepted-kydranlie engineer#ng-preetiees---6nek-ewaer-skell-tken-be-eatitled-te-ntilise-tke- benndaries-se-determined-in-gregaratien-ef-kis-site-plea.-- (b) Prerequisites for flood plain development: (1) The lowest habitable f€eed floor including the basement of any residential structure, including a_ mobile homes-er-trailer, must be at least one foot higher than the elevation of the outer limit of the FP District. The elevation of such lowest floor shall be grevided-eleng-with shown on the required site plan. No such residential structure shall be permitted to encroach upon the floodway. Any eellar a€-a-residential-strnetnre-net desigaed-fer-hnman-kabitatien-map-lie-below-the-elevatiea-of-the-enter-- limot-ef-the-PP-B#striet;-presided-that-it-is-€leedgreefed-in-aeeerdaaee Nith-{b}{3}-ef-this-Beet#en;-sad-€artker-gre�ided;-that-the-leeetiea-of-snek strnetnre-deer-net-enereaek-ngen-ilea-€leedKay- • (2) Any new structure, other than a residential structure, to be built in a business or manufacturing zone overlapped by the FP District, or any addition to an existing commercial or industrial building, shall be con- structed so that the lowest floor is at least one foot higher than the elevation of the outer limit of the FP District, or shall be floodproofed in accordance with (b)(3) of this section and applicable provisions of the Uniform Statewide Building Code; provided, that in no case shall such structure encroach upon the floodway. (3) In cases in which floodproofing measures are permitted to satisfy the requirements of this article the planning commission shall seek to insure in the process of site plan review that such measures will be con- sistent with flood elevations, velocities and volumes of the intermediate- regienal-€lead 100 year flood for the site in question. On any building or structure for which floodproofing is required, such measures shall be performed to an elevation of one foot above the level of the intermediate regional -€lead 100 year flood. The following floodproofing measures may be required: a. Anchorage to resist flotation and lateral movement; b. Installation of watertight doors, bulkheads, and shutters, or • similar methods of construction;