Agenda - Planning Commission - 04/27/2023

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1 waters frontage, must either be set back double the normal ordinary high water level setback 2 or be substantially screened from view from the water by vegetation or topography,assuming 3 summer, leaf-on conditions. 4 (2) Design criteria for structures. 5 a. High water elevations. Structures must be placed in accordance with any floodplain 6 regulations applicable to the site. Where these controls do not exist, the elevation to which 7 the lowest floor, including basement, is placed or floodproofed must be determined as 8 follows: 9 1. For lakes, by placing the lowest floor at a level at least three feet above the highest known 10 water level, or three feet above the ordinary high water level, whichever is higher; 11 2. For rivers and streams, by placing the lowest floor at least three feet above the flood of 12 record, if data are available. If data are not available, by placing the lowest floor at least 13 three feet above the ordinary high water level,or by conducting a technical evaluation to 14 determine effects of proposed construction upon flood stages and flood flows and to 15 establish a flood protection elevation. Under all three approaches, technical evaluations 16 must be done by a qualified engineer or hydrologist consistent with Minn. Rules pts. 17 6120.5000-6120.6200 governing the management of floodplain areas. If more than one 18 approach is used, the highest flood protection elevation determined must be used for 19 placing structures and other facilities; and 20 3. Water-oriented accessory structures may have the lowest floor placed lower than the 21 elevation determined in this item if the structure is constructed of flood-resistant 22 materials to the elevation, electrical and mechanical equipment is placed above the 23 elevation and, if long duration flooding is anticipated, the structure is built to withstand 24 ice action and wind-driven waves and debris. 25 b. Water-oriented accessory structures. Each lot may have one water-oriented accessory 26 structure not meeting the normal structure setback in this subdivision if this water-oriented 27 accessory structure complies with the following provisions: 28 1. The structure or facility must not exceed ten feet in height, exclusive of safety rails, and 29 cannot occupy an area greater than 250 square feet. Detached decks must not exceed 30 eight feet above grade at any point; 31 2. The setback of the structure or facility from the ordinary high water level must be at least 32 ten feet; 33 3. The structure or facility must be treated to reduce visibility as viewed from public waters 34 and adjacent shorelands by vegetation, topography, increased setbacks or color, 35 assuming summer, leaf-on conditions; 36 4. The roof may be used as a deck with safety rails, but must not be enclosed or used as a 37 storage area; 38 5. The structure or facility must not be designed or used for human habitation and must not 39 contain water supply or sewage treatment facilities; and 40 6. As an alternative for general development and recreational development waterbodies, 41 water-oriented accessory structures used solely for watercraft storage, and including 42 storage of related boating and water-oriented sporting equipment, may occupy an area 43 up to 400 square feet provided the maximum width of the structure is 20 feet as 44 measured parallel to the configuration of the shoreline. 45 c. Stairways, lifts, and landings. Stairways and lifts are the preferred alternative to major 46 topographic alterations for achieving access up and down bluffs and steep slopes to shore 47 areas. Stairways and lifts must meet the following design requirements: Page 126 of 147