11-14-2022 Council Packet - Laserfiche WebLink

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FILE # LA22-000042 17 October 2022 Page 3 of 4 structures must be adequately anchored to prevent flotation, collapse or lateral movement and designed to equalize hydrostatic flood forces on exterior walls. (6) As an alternative, an accessory structure may be internally/wet floodproofed to the FP3 or FP4 floodproofing classifications in the state building code, provided the accessory structure constitutes a minimal investment and does not exceed 576 square feet in size. Designs for meeting this requirement must either be certified by a registered professional engineer or meet or exceed the following criteria: 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 section of protected wetlands or public waters are subject to the provisions of Minn. Stat. § 103G.245. (e) A levee, dike or floodwall constructed in the floodway must not cause an increase to the one percent chance or regional flood. The technical analysis must assume equal conveyance or storage loss on both sides of a stream. (f) Floodway developments must not adversely affect the hydraulic capacity of the channel and adjoining floodplain of any tributary watercourse or drainage system. A CUP may be granted subject to such conditions as the Council may prescribe. Additionally, a CUP shall remain in effect as long as the conditions imposed by the City Council are observed, but nothing in this section shall prevent the city from enacting or amending official controls to change the status of conditional uses. Conditional Use Permit Analysis Orono’s concurrent jurisdiction over permanent docks is primarily via the City’s floodplain regulations, which provide no significant standards pertinent to the approval of permanent docks. Both permanent and seasonal docks fall under the zoning category of accessory structures, so with the exception of the RS District, one cannot have a permanent or seasonal dock without a principal residence structure. This property is zoned RS- Seasonal Recreation, there is a seasonal principal residence on the property. There are no specific Building Code construction standards for docks. The City will require that a zoning permit be issued to document the existence and construction of the permanent dock. Permanent docks (i.e. those docks with permanent pilings which cannot be removed without heavy equipment) sometimes result in requests by property owners for winter de-icing, to avoid ice damage. The applicant has not indicated there will be a need for winter de-icing, but should be asked to confirm this. There are other permanent docks on Big Island, and the city has received no documented problems or issues. Another potential concern would be whether the work is in a sensitive habitat or spawning area, and whether the permanent dock might affect navigation or winter vehicular traffic on the lake. Neither