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which increases the size of the of the enclosed first floor or basement area of a structure by more than fifty percent (50%) of the original enclosed area. The term does not, however, include either (1) any project for improvement of a structure to comply with existing state or city health, sanitary, or safety code specifications which are solely necessary to assure safe living conditions, or (2) any alteration of a structure listed on the National Register of Historic Places or a state inventory of historic places. (v) Violation means the failure of a structure or other development to be fully compliant with this ordinance. (w) Water surface elevation means the height, in relation to the National Geodetic Vertical Datum (NGVD)of 1929 (or other datum, where specified), of floods of various magnitudes and frequencies in the floodplains of coastal or riverine areas. (x) Watercourse means a lake, river, creek, stream, wash, arroyo, channel, or other topographic feature on or over which waters flow at least periodically. Watercourse includes specifically designated areas in which substantial flood damage may occur. SECTION 5: Section 7-8 of the Santa Ana Municipal Code is hereby amended such that it reads as follows: Sec. 7-8. Prospective application. (a) The regulations imposed by this chapter shall apply to structures and manufactured homes only if the start of construction or substantial improvement occurs after the effective date of this chapter. Any amendment to such regulations shall apply only if the start of construction occurs after the effective date of such amendment. (b) "Substantial improvement" is considered to occur when the first alteration of any wall, ceiling, floor or other structural part of the building commences, whether or not that alteration affects the external dimensions of the structure. .SECTION 6: Section 7-10 is added to the Santa Ana Municipal Code to read in full as follows: Sec. 7-10. Warning and disclaimer of liability. The degree of flood protection required b y t his ordinance i s considered reasonable for regulatory purposes and is based on scientific and engineering considerations. Larger floods can and will occur on rare occasions. Flood heights may be increased by manmade or natural causes. This ordinance does not imply that land outside the areas of special flood hazards or uses permitted within such areas will be free from flooding or flood damages. This ordinance shall not create liability on the part of the City of Santa Ana, any officer or employee thereof, the State of California, or the Federal Insurance Administration, Federal Emergency Management Agency, for any flood damages that Ordinance No. NS-2631 Page 4 of 13