2015-010 Council Ordinances - Laserfiche WebLink

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2. Fill, dredge spoil, and other similar materials deposited or stored in the floodplain must be protected from erosion by vegetative cover, mulching, riprap or other acceptable method. Permanent sand and gravel operations and similar uses must be covered by a long-term site development plan. 3. Temporary placement of fill, other materials, or equipment which would cause an increase to the stage of the 1% percent chance or regional flood may only be allowed if the City Council has approved a plan that assures removal of the materials from the floodway based upon the flood warning time available. (c) Accessory Structures: 1. Accessory structures must not be designed for human habitation. 2. Accessory structures, if permitted, must be constructed and placed on the building site so as to offer the minimum obstruction to the flow of flood waters: a. Whenever possible, structures must be constructed with the longitudinal axis parallel to the direction of flood flow; and b. So far as practicable, structures must be placed approximately on the same flood flow lines as those of adjoining structures. 3. Accessory structures shall be elevated on fill or structurally dry floodproofed in accordance with the FP -I or FP -2 flood -proofing classifications in the State Building Code. All floodproofed accessory structures must meet the following additional standards: a. The structure must be adequately anchored to prevent flotation, collapse or lateral movement and designed to equalize hydrostatic flood forces on exterior walls; and b. Any mechanical and utility equipment in the structure must be elevated to or above the regulatory flood protection elevation or properly floodproofed. 4. As an alternative, an accessory structure may be internally/wet floodproofed to the FP -3 or FP -4 flood -proofing classification in the State Building Code, provided the accessory structure constitutes a minimal investment, does not exceed 576 square feet in the size. A detached garage may only be used for parking of vehicles and limited storage. All flood -proofed accessory structures must meet the following standards: a. To allow for the equalization of hydrostatic pressure, there must be a minimum of two "automatic" openings in the outside walls of the structure, with a total net area of not less than one square inch for every square foot of enclosed area subject to flooding; and b. There must be openings on at least two sides of the structure and the bottom of all openings must be no higher than one foot above the lowest adjacent grade to the structure. Using human intervention to open a garage door prior to flooding will not satisfy this requirement for automatic openings. (d) Structural works for flood control that will change the course, current or cross 10 of 25