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80 ORDINANCE 1987- 138 AN ORDINANCE OF THE CITY COUNCIL OF THE CITY OF SAN MARCOS, TEXAS, AMENDING ARTICLE III, CHAPTER 5, FLOOD DAMAGE PREVENTION ORDINANCE, OF THE SAN MARCOS CODE OF ORDINANCES TO COMPLY WITH NEW FEMA REGULATIONS REGARDING MANUFACTURED HOUSING AND MOBILE HOMES AND ESTABLISHING AN EFFECTIVE DATE. BE IT ORDAINED BY THE CITY COUNCIL OF THE CITY OF SAN MARCOS, TEXAS: a PART 1: That Section 5-47 of the San Marcos Code of Ordinances is amended by the addition of new subsection 9 as follows: Se c. 5 - 47 . De fini tions. ( 9 ) Existing Manufactured Home Park or Manufactured Home Subdivision- An organized developed property for the placement and occupancy of manufactured homes, either under a single unified ownership or subdivided by an initial owner, which came into existence prior to the adoption of the City's Floodplain Ordinance on November 25,1974. PART 2. That subsections (9) through (28) of Section 5-47 of the San Marcos Code of Ordinances are renumbered as Sections (10) through (29) respectively. PART 3. That Section 5-47(7) of the San Marcos Code of Ordinances is repealed and the following adopted in its place. . . . (7) Elevated Building- means a nonbasement building (i) built, in the case of a buildi'ng in Zones Al-30, AE, A, A99, AO, AH, B, C, X, and D, to have the bottom of the lowest horizontal structure member of the elevated floor elevated above the ground level by means of pilings, colums (posts and piers), or shear walls parallel to the floor of the water and (ii) adequately anchord so as not to impair the structural integrity of the building during a flood of up to the magnitude of the base flood. In the case of Zones AI-30, AE, A, A99, AO, AH, B, C, X, D, "elevated building" also includes a building elevated by means of fill or solid foundation perimeter wells with openings sufficient to facilitate the unimpeded movement of flood waters. In the case of Zones VI-3O, VE, or V, "elevated building" also includes a building otherwise meeting the definition of "elevated building", even though the lower area is enclosed by means of breakaway walls if the breakaway walls meet the standards of Section 60.3(e)(5) of the National Flood Insurance Program regulations. PART 4. That Section 5-16 of the San Marcos Code of is amended by the addition of subsection (c) as follows: Ordinances Sec. 5-61. Specific Standards For Construction. c. Enclosures- new construction and substantial improvements, with fully enclosed areas below the lowest floor that are subject to flooding shall be designed to automatically equalize hydrostatic flood forces on exterior walls by allowing for the entry and exit of floodwaters. Designs for meeting this requirement must either be certified by a registered professional engineer or architect or meet or exceed the following minimum criteria: (1) A minimum of two openings having a total net area of not less than one square inch for every square foot of enclosed area subject to flooding shall be provided. (2) The bottom of all openings shall be no higher than foot above grade. one