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PROVISIONS FOR FLOOD HAZARD REDUCTION
In all areas of special flood hazards the following standards are required:
(A) Anchoring.
(1) All new construction and substantial improvements shall be anchored to prevent flotation, collapse or lateral movement of the structure resulting from hydrodynamic and hydrostatic loads, including the effects of buoyancy.
(2) All manufacturing homes shall meet the anchoring standards of § 151.23.
(B) Construction materials and methods.
(1) All new construction and substantial improvements shall be constructed with materials and utility equipment resistant to flood damage.
(2) All new construction and substantial improvements shall be constructed using methods and practices that minimize flood damage.
(3) All new construction and substantial improvements shall be constructed with electrical, heating, ventilation, plumbing and air conditioning equipment and other service facilities that are designed and/or located so as to prevent water from entering or accumulating within the components during conditions of flooding.
(4) Require within the AH or AO Zones, adequate drainage paths around structures on slopes to guide floodwaters around and away from proposed structures.
(C) Elevation and floodproofing.
(1) New construction and substantial improvement of any structure shall have the lowest floor, including basement, elevated to or above the base flood elevation. Nonresidential structures may meet the standards in subdivision (3) of this division. Upon completion of the structure, the elevation of the lowest floor, including basement, shall be certified by a registered professional engineer or surveyor, or verified by the community Building Inspector to be properly elevated. Such certification or verification shall be provided to the Floodplain Administrator.
(2) New construction and substantial improvement of any structure in the AO Zone shall have the lowest floor, including basement, elevated above the highest adjacent grade at least as high as the depth number specified in feet on the FIRM, or at least two feet if no depth number is specified. Nonresidential structures may meet the standards in subdivision (3) of this division. Upon the completion of the structure, the elevation of the lowest floor, including basement, shall be certified by a registered professional engineer or surveyor, or verified by the community Building Inspector to be properly elevated. Such certification or verification shall be provided to the Floodplain Administrator.
(3) Nonresidential construction shall either be elevated in conformance with subdivisions (1) or (2) of this division or together with attendant utility and sanitary facilities:
(a) Be floodproofed so that below the base flood level, the structure is watertight with walls substantially impermeable to the passage of water;
(b) Have structural components capable of resisting hydrostatic and hydrodynamic loads and effects of buoyancy; and
(c) Be certified by a registered professional engineer or architect that the standards of this division are satisfied. Such certifications shall be provided to the Floodplain Administrator.
(4) Require, for all new construction and substantial improvements, that 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:
(a) Either 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. The bottom of all openings shall be no higher than one foot above grade. Openings may be equipped with screens, louvers, valves or other coverings or devices provided that they permit the automatic entry and exit of floodwaters; or
(b) Be certified to comply with a local floodproofing standard approved by the Federal Insurance Administration.
(5) Manufactured homes shall also meet the standards in § 151.23.
('81 Code, § 15.44.160) (Ord. 906, passed - -88) Penalty, see Ch. 13
(A) All new and replacement water supply and sanitary sewage systems shall be designed to minimize or eliminate infiltration of floodwaters into the system and discharge from systems into floodwaters.
(B) On-site waste disposal systems shall be located to avoid impairment to them or contamination from them during flooding.
('81 Code, § 15.44.170) (Ord. 906, passed - -88) Penalty, see Ch. 13
(A) All preliminary subdivision proposals shall identify the flood hazard area and the elevation of the base flood.
(B) All final subdivision plans will provide the elevation of proposed structure(s) and pads. If the site is filled above the base flood, the final pad elevation shall be certified by a registered professional engineer or surveyor and provided to the Floodplain Administrator.
(C) All subdivision proposals shall be consistent with the need to minimize flood damage.
(D) All subdivision proposals shall have public utilities and facilities such as sewer, gas, electrical and water systems located and constructed to minimize flood damage.
(E) All subdivisions shall provide adequate drainage to reduce exposure to flood hazards.
('81 Code, § 15.44.180) (Ord. 906, passed - -88) Penalty, see Ch. 13
All new and replacement manufactured homes and additions to manufactured homes shall:
(A) Be elevated so that the lowest floor is at or above the base flood elevation; and
(B) Be securely anchored to a permanent foundation system to resist flotation, collapse or lateral movement.
(C) Other than expansion of an existing manufactured home park or subdivision, division (A) of this section shall not apply until October 1, 1988, to manufactured homes placed or substantially improved in an existing manufactured home park or subdivision except where the repair, reconstruction, or improvement of the streets, utilities, and pads equals or exceeds 50% of the value of the streets, utilities and pads before the repair, reconstruction or improvement has commenced.
('81 Code, § 15.44.190) (Ord. 906, passed - -88) Penalty, see Ch. 13
(A) Located within areas of special flood hazard established in § 151.07 are areas designated as floodways.
(B) Since the floodway is an extremely hazardous area due to the velocity of floodwaters which carry debris, potential projectiles, and erosion potential, the following provisions apply:
(1) Prohibit encroachments, including fill, new construction, substantial improvements, and other development unless certification by a registered professional engineer or architect is provided demonstrating that encroachments shall not result in any increase in flood levels during the occurrence of the base flood discharge.
(2) If subdivision (1) of this division is satisfied, all new construction and substantial improvements shall comply with all other applicable flood hazard reduction provisions of this subchapter.
('81 Code, § 15.44.200) (Ord. 906, passed - -88)
VARIANCE PROCEDURE
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