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900ORDINANCE N0.400 AN ORDINANCE AMENDING, THE 1973 ADDITION OF THE SOUTHERN STANDARD BUILDING CODE AS ADOPTED BY THE CITY OF EDGEWATER, FLORIDA AND FURTHER. DESIGNATING CERTAIN REGULATIONS TO APPLY TO AREAS DESIGNATEDAS SPECIAL FLOOD AREAS AND FURTHER DESIGNATING REGULATIONS FOR OTHER FLOOD PROOFING METHODS, REPEALING ALL ORDIr1ANCES IN CONFLICT HEREWITH PROVIDING AN EFFECTIVE DATE THEREFOR. BE IT ENACTED BY THE PEOPLE OF THE CITY OF EDGEWATER, FLORIDA: SECTION I. The 1973 Edition of the Southern Standard Building Code is hereby amended by amending Chapter XIII, Section 1301, by adding Section 1301.3 to read as follows: "Section 1301.3 - Foundation, walls, and floor grades to preclude flooding of any part of portion of a building. Except as other- wise provided, the floor level of any building shall be a mini- mum of twelve inches (12") above the crown of the road; provided however, that no building permit shall be issued until drainage plans have been approved by the Public Works Department of the Hty of Edgewater, Florida." SECTION I(A). In "Special Flood Hazard Regulation Areas" the following regulations shall apply: a. No residential structure or substantial improvements to existino ones shall have a first floor elevation less than the base flood elevations as established on the City of Edgewater, Florida Flood Hazard Boundary Map, number NOI-02 dated August 23, 1974. Such map is on file in the City Clerk's Office, Edgewater, Florida. b. New non-residential structures or substantial improvements to existing ones that are located in Special Flood Hazard Areas shall be elevated or flood proofed to the 100-year flood level. c. New construction, substantial improvements, and major repairs of all structures in special flood hazard areas must be built and anchored in accordance with flood proofing requirements of the City's building code. d. Existing nonconforming uses to the flood hazard areas designated "V" on the Flood Hazard Boundary Map shall not be expanded but may be modified, altered, or repaired to incorporate flood proofing measures. e. New construction to flood hazard areas designated "V" on the Flood Hazard Boundary Map must be elevated to the 100 year flood level, anchored to piles, have open space provided below the first floor, and be located landward of the mean high water mark. f. Review subdivision proposals and other proposed new develop- ments to assure that all such proposals are consistent with the need to minimize flood damage; all public utilities and facili- ties, such as sewer, qas, electrical, and water systems are located, elevated, and constructed to minimize or eliminate flood damage; and adequate drainage is provided so as to reduce exposure to flood hazards. g. Require new or replacement water supply systems and/or sanitary sewage systems to be designed to minimize or eliminate infiltration of flood waters into the systems and discharges from the systems into flood waters, and require on -site waste disposal systems to be located so as to avoid impairment of them or contamination from them duringflooding. SECTION II (B) REQUIREMENTS FOR OTHER F100D-PROBFING METHODS a. METHODS: A building shall be considered as being completely flood -proofed if the lowest elevation of all space(s) within the building perimeter is above the RFD as achieved by: 1. building on natural terrain beyond the RFD limit line on natural undisturbed ground, (RFD • "Regulatory Flood Datum") 2. building on fill 3. building on stilts 4, protection by dikes, levees and/or flood walls. These methods may be used alone or in combination to achieve the required degree of flood proofing. Data and design procedures -2- shall, in all cases, be based on recognized and acceptable methods of the applicable disciplines involved, and the foi- lowing additional requirements. b. FLOOD -PROOFING BY ELEVATING THE BUILDING: 1. NATURAL TERRAIN: In addition to the requirements of "The Building Code," the building shall be located not less than 10 feet back from the line of incidence of the RFD on the ground, foundation design shall take into consideration the effects of flood waters on slope stability shall be investigated normal access to the building shall be by direct connections with areas above the RFD and all utility service lines shall be designed and constructed as required to protect the building and/or its components from damage or failure during a flooding event to the RFD. 2. BUILDING ON FILL: The building and all parts thereof may be constructed above the RFD on an earth fill. Prior to place- ment of any fill or embankment materials, the area upon which fill is to be placed, including a five-foot strip measured hori- zontally beyond and contiguous to the toe line of the fill, shall be cleared of standing trees and snags, stumps, brush, down timber, logs and other growth, and all objects including structures on and above the ground surface or partially buried. The area shall be stripped of topsoil and all other material which is considered unsuitable by the Building Official as foundation material. All combustible and noncombustible materials and debris from the clearing ,grubbing and stripping operations shall be removed from the proposed fill area and sisposed of at locations above the RFD and/or in the manner approved by the Building Official. Fill material shall be of a selected type, preferably granular and free -graining, placed in compacted layers. Fill selection and placement shall recognize the effects of saturation from flood waters on slope stability, uniform and differential settlement, and scour potential. The minimum elevation of the top of slope -3- for the fill section shall be at the RFD. Minimum distance from ,any point of the building perimeter to the top of the fill slope shall be either 25 feet or twice the depth of fill at that point, whichever is the greater distance. This requirement does not apply to roadways, driveways , playgrounds, and other related features which are not integral and functional parts of the building proper. Fill slopes for granular materials shall be no steeper than one vertical on one and one-half horizontal, unless substantiating data justifying steeper slopes are sub- mitted to the Building Official and approved. For slopes ex- posed to flood velocities of less than five (5) feet per second, grass or vine cover, weeds, bushes and similar vegetation under- growth will be considered to provide adequate scour protection. For higher velocities, stone or rock slope protection shall be provided. 3. BUILDING ON "STILTS": The building may be constructed above the RFD by supporting it on "stilts" or other columnar type members, such as columns, piers, and in certain cases, walls. Clear spacing of support members, measured perpendicular to the general direction of flood flow shall not be less than eight (8) feet apart at the closest point. The "stilts" shall, as far as practicable, be compact and free from unnecessary appendages which would tend to trap or restrict free passage of debris during a flood. Solid walls, or walled in columns are permissible if oriented with the lonaest dimension of the mem- ber parallel to the flow. "Stilts" shall be capable of resisting all applied loads as required by "The Building Code" and all applicable flood related loads as required herein. Bracing, where used to provide lateral stability, shall be of a type that causes the least obstruction to the flow and the least potential for trapping floating debris. Foundation supports for the "stilts" may be of any approved type capable of resisting all applied loads, such as spread footings, mats, piles and simi- lar types. In all cases, the effect of submergence of the soil -4- and additional flood water related loads shall be recognized. The petential of surface scour around the stilts shall be recognized and protective measures provided, as required. 4. PROTECTION BY DIKES, LEVEES, AND FLOODWALLS: The building shall be considered a flood -proofed type when it is protected from flood waters to the RFD by means of dikes, levees, or floodwalls, either used alone or in combination, as necessary. This protection may extend all around the building where all surrounding ground is low, or on one or more sides where high ground (above the RFD) exists on the remaining sides. Regard- less of type and method of construction, dikes, levees, and floodwalls shall be designed and constructed in accordance with recognized and accepted engineering practice and methods. They shall have adequate strength and stability to resist all applied loads and shall provide an effective watertight barrier up to the RFD. 5. DIKES AND LEVEES: Dikes and levees shall be constructed of suitable selected materials, placed and compacted in layers to a section that has the required stability and impermeability. Prior to start of placement operations, the area on which the dike or levee is to be constructed shall be prepared as required by Paragraph 2. In cases where underlying materials are highly pervious, it may be necessary to provide impervious cutoffs. A filter blanket, drainage ditch and/or trench shall be provided along the interior toe of the construction to collect seepage through the dike or levee. All seepage and storm drainage shall be collected at a sump or sumps where it may be pumped out over the dike. Normal surface runoff within and into the diked area during nonflood periods may be discharged through appropriate drainage pipes or culverts through the dike. Such culverts shall have a dependable flap, slide gate, or backflow preventing device which wodld close either automatically or manually to prevent backflow during a flood. Scour protection measures for dikes and -5- levees shall comply with the requirements of Paragraph 2. Clearance from the toe of the dike or levee to the building shall be a minimum of 20 feet or twice the height of the dike or levee above the interior finished grade, whichever ie;greater. 6. FLOODWALLS: Floodwalls may be constructed of concrete steel sheet piling, or other suitable structural materials. Regardless of type, the wall shall have adequate strength and stability to resist the applied loads. The provisions of Paragraph 5 shall be followed, as applicable, regarding removal of unsuitable materials provision of impervious cutoffs, provision of seepage and storm drains, drainage ditches, sumps and sump pumps, and the minimum clearances from the floodwall to the building. It shalt be recog- nized in the drainage provisions that substantial amounts of leakage may occur through the interlock of a steel sheet piling wall. Adequate expansion and contraction joints shall be pro- vided in the walls. Expansion joints will be provided for all changes in wall direction. Contraction and expansion joints in concrete walls shall be provided with waterstops and joint sealing material both in the stem and in the base. Steel sheet piling walls may be encased in concrete for corrosion protection or shall be coated with a coal tar epoxy coating system and periodi- cally inspected and maintained. Steel sheet piling walls may be used as the impervious core of a dike. SECTION III. That all Ordinances or parts of Ordinances and all Resolutions and parts of Resolutions in conflict herewith be and the same are hereby repealed. SECTION IV. That this Ordinances shall take effect immediately upon its adoption by the City Council and approval by the Mayor. SECTION V. The City Clerk shall advertise this Ordinance as re- quired by law. -6- The first reading of the above Ordinance was read in full and passed by vote of the City Council of the City of Edgewater, Florida at a regular meeting of said Council held on the 16th day of December, 1974, and approved as provided by law. The second reading of thds Ordinance to be at a regular meeting of the City Council to be held on the _day of January, A.D. 1975. Roll call vote FIRST READING SECOND READING Mayor Councilman Councilman Councilman Councilman I �r ar // city clerk Approved this _LL±day of ... ,,1975. This Ordinance was prepared by: Joseph E. Weaver, City Attorney -7-