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Chapter 910 Shoreland Overlay District Page 910-6 1. Determining lowest floor elevations. Structures must be placed at an elevation consistent with the applicable floodplain regulatory elevations. Where these elevations are not known, the lowest floor, including basement, must be placed or flood-proofed at an elevation determined using the following methodology: a. For lakes, by placing the lowest floor at a level at least three feet above the highest known water level, or three feet above the ordinary high water level, whichever is higher; b. For rivers and streams, by placing the lowest floor at least three feet above the highest known flood elevation. If highest known flood elevation is not available, by placing the lowest floor at least three feet above the ordinary high water level, or by conducting a technical evaluation to establish a flood protection elevation. Technical evaluations must be done by a qualified engineer or hydrologist consistent with Minnesota Rules, parts 6120.5000 to 6120.6200. E. Impervious Surface Limits Impervious Surfaces, as defined in Chapter 919 of the Zoning Code are subject to the following restrictions in the shoreland overlay district: Table 910-8: Impervious Surface Limits Maximum Impervious Surface Allowance - Residentially Zoned Properties Maximum Impervious Surface Allowance – Commercial, Industrial, and Public Zoned Properties 25% 75% 1 1. Allowed to be up to 75% provided that all stipulations of the City’s stormwater management plan are met. Additionally, this allotment may be exceeded provided a Conditional Use Permit is approvedreceived. F. Accessory Structures and Buildings Accessory Structure and Buildings shall follow the underlying zoning district standards except for where the provisions of these chapters provide a stricter standard. No structure besides WOAS as regulated in this chapter shall be permitted to encroach the OHWL setback. 1. a. Deck additions may be allowed without a variance to a structure not meeting the required setback from the ordinary high-water level if all of the following criteria and standards are met: a. (1) The structure existed on the date the structure setbacks were established; b.(2) A thorough evaluation of the property and structure reveals no reasonable location for a deck meeting or exceeding the existing ordinary high-water level setback of the structure; c. (3) The deck encroachment toward the ordinary high-water level does not exceed fifteen (15) percent of the existing setback of the structure from the ordinary high water level or does not encroach closer than thirty (30) feet, whichever is more restrictive; and d. (4) The deck is constructed primarily of wood, and is not roofed or screened. G. Water-oriented Accessory Structures or Facilities Each residential lot may have one (1) water-oriented accessory structure or facility if it complies with the following provisions: 1. The structure or facility must not exceed ten (10) feet in height, exclusive of safety rails, and must not exceed a total area of two hundred and fifty (250) square feet. Any attached or detached deck Formatted: Font: (Default) Times New Roman, 11 pt Formatted Commented [DS17]: Please add this required model ordinance language regarding lowest floor elevations in shoreland. Formatted: Font: (Default) Times New Roman, 11 pt Formatted: Font: (Default) Times New Roman, 11 pt Formatted: Font: (Default) Tahoma, 9.5 pt Commented [BH18]: Changed from 30% which was modification made by LC at some point without DNR approval Commented [BH19]: Permitted by DNR as specific deviation for LC in 1997, including lower qualification Commented [DS20]: Shouldn’t this be “approved”, not “received”? Commented [BH21]: Moved from 910.020 as it fits better here.