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3) at least three feet above the wetland boundary as defined in Section 18.020.53. The city engineer shall develop and maintain a list of elevations of known 100 year flood levels, ordinary high water levels, highest known water levels and wetland boundary levels as they become available through special studies or the Minnesota Department of Natural Resources. 18.050.2 Low Floor Elevation Exceptions. A variance may be granted rrom the elevation requirements specified in 18.050.1 (above) only where a hardship is determined and provided the structure is flood-proofed according to state and federal standards for floodplain areas. Water-oriented accessory structures may have the lowest floor placed lower than the elevation determined in Section 18.050.1 if the structure is constructed of flood-resistant materials to the elevation, electrical and mechanical equipment is placed above the elevation and, if long duration flooding is anticipated, the structure is built to withstand ice action and wind-driven waves and debris. 18.050.3 Permitted Water-oriented Accessory Structures. Each lot may have one water-oriented non-habitable accessory structure not meeting the normal structure setback in Section 18.045.2 of this code if this water-oriented accessory structure complies with the following provisions: (1) Water oriented accessory structure dimensional requirements. a) Maximum floor area 250 sq. ft. 12 feet 10 feet b) c) Maximum width as viewed from water Maximum Height Setback from ordinary high water Boathouse setback from ordinary high water level d) e) 10 feet ** f) g) Side yard setback from property line Detached deck height above grade 20 feet 8 feet * ** (2) (3) 50% of distance between ordinary high water mark and the structure setback from the water. also permitted for docks, and off season storage of ice fishing houses and docks. the structure or facility shall be constructed of material architecturally similar in design, texture, and color to the principal structure on the lot; the design shall be reviewed by the City Planner prior to issuance of building permits; the structure shall be screened a minimum of 50% by opaque vegetation or topography on the 3 walls seen from the lake with ecologically suited landscaping landward of the ordinary high water level from the lake; 14