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DRAFT <br /> Revised August 21, 1998 <br /> above the highest known water level, or three feet above the <br /> ordinary high water level, whichever is higher; <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 /> (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 /> 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 /> (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 /> (2) the setback of the structure or facility from the ordinary high water <br /> level must be at least ten feet; <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 /> (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 /> (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 /> SMO- 260.081 -20- 260- 081 -10 <br />