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Chapter 910 Shoreland Overlay District <br /> <br /> <br /> Page 910-6 <br />Highest Known Water Level 1, <br />whichever is higher. <br />1. Determining lowest floor elevations. Structures must be placed at an elevation consistent with the <br />applicable floodplain regulatory elevations. Where these elevations are not known, the lowest <br />floor, including basement, must be placed or flood-proofed at an elevation determined using the <br />following methodology: <br />a. For lakes, by placing the lowest floor at a level at least three feet above the highest <br />known water level, or three feet above the ordinary high water level, whichever is higher; <br />b. For rivers and streams, by placing the lowest floor at least three feet above the highest <br />known flood elevation. If highest known flood elevation is not available, by placing the <br />lowest floor at least three feet above the ordinary high water level, or by conducting a <br />technical evaluation to establish a flood protection elevation. Technical evaluations must <br />be done by a qualified engineer or hydrologist consistent with Minnesota Rules, parts <br />6120.5000 to 6120.6200. <br /> <br />E. Impervious Surface Limits <br />Impervious Surfaces, as defined in Chapter 919 of the Zoning Code are subject to the following <br />restrictions in the shoreland overlay district: <br />Table 910-14: Impervious Surface Limits <br />Maximum Impervious Surface Allowance - <br />Residentially Zoned Properties <br />Maximum Impervious Surface Allowance – <br />Commercial, Industrial, and Public Zoned <br />Properties <br />25% 75% 1 <br />1. Allowed to be up to 75% provided that all stipulations of the City’s stormwater management plan <br />are met. Additionally, this allotment may be exceeded provided a Conditional Use Permit is <br />approved. <br /> <br />F. Accessory Structures and Buildings <br />Accessory Structure and Buildings shall follow the underlying zoning district standards except for <br />where the provisions of these chapters provide a stricter standard. No structure besides WOAS as <br />regulated in this chapter shall be permitted to encroach the OHWL setback. <br /> <br />1. Deck additions may be allowed without a variance to a structure not meeting the required <br />setback from the ordinary high-water level if all of the following criteria and standards are <br />met: <br />a. The structure existed on the date the structure setbacks were established <br />b. A thorough evaluation of the property and structure reveals no reasonable location for a <br />deck meeting or exceeding the existing ordinary high-water level setback of the structure; <br />c. The deck encroachment toward the ordinary high-water level does not exceed fifteen (15) <br />percent of the existing setback of the structure from the ordinary high water level or does <br />not encroach closer than thirty (30) feet, whichever is more restrictive; and <br />d. The deck is constructed primarily of wood, and is not roofed or screened. <br /> <br />G. Water-oriented Accessory Structures or Facilities <br />Each residential lot may have one (1) water-oriented accessory structure or facility if it complies <br />with the following provisions: <br />1. The structure or facility must not exceed ten (10) feet in height, exclusive of safety rails, and <br />must not exceed a total area of two hundred and fifty (250) square feet. Any attached or