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<br />SMO-260.081 <br /> <br />DRAFT <br />Revised July 23, 1998 <br /> <br />above the highest known water level, or three feet above the <br />ordinary high water level, whichever is higher; <br /> <br />(2) for rivers and streams, by placing the lowest floor at least three feet <br />above the flood of record, if data are available. If data are not <br />available, by placing the lowest floor at least three feet above the <br />ordinary high water level, or by conducting a technical evaluation <br />to determine effects of proposed construction upon flood stages and <br />flood flows and to establish a flood protection elevation. Under all <br />three approaches, technical evaluations must be done by a qualified <br />engineer or hydrologist consistent with parts 6120.5000 to <br />6120.6200 governing the management of flood plain areas. If more <br />than one approach is used, the highest flood protection elevation <br />determined must be used for placing structures and other facilities; <br />and <br /> <br />(3) water-oriented accessory structures may have the lowest floor placed <br />lower than the elevation determined in this item if the structure is <br />constructed of flood-resistant materials to the elevation, electrical <br />and mechanical equipment is placed above the elevation and, if long <br />duration flooding is anticipated, the structure is built to withstand <br />ice action and wind-driven waves and debris. <br /> <br />B. Water-oriented Accessory Structures.' Each lot may have one <br />water -oriented accessory structure not meeting the normal structure setback <br />in Section 5.21 of this ordinance if this water-oriented accessory structure <br />complies with the following provisions: <br /> <br />(1) the structure or facility must not exceed ten feet in height, exclusive <br />of safety rails, and cannot occupy an area greater than 250 square <br />feet. Detached decks must not exceed eight feet above grade at any <br />point; <br /> <br />(2) the setback of the structure or facility from the ordinary high water <br />level must be at least ten feet; <br /> <br />, <br />(3) the structure or facility must be treated to reduce visibility as viewed <br />from public waters and adjacent shorelands by vegetation, <br />topography, increased setbacks or color, assuming summer, leaf-on <br />conditions; <br /> <br />(4) the roof may be used as a deck with safety rails, but must not be <br />enclosed or used as a storage area; <br /> <br />(5) the structure or facility must not be designed or used for human <br />habitation and must not contain water supply or sewage treatment <br />facilities; and <br /> <br />-20- <br /> <br />260-081-10 <br />