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Parking E <br />tructures <br />above the 100 -vear <br />above the 100 -year <br />die emereecev nverllnw elevation. <br />fleed. elevation. <br />flood elevation. <br />Public i <br />.>adwory <br />• <br />Roadway shall not <br />• <br />Roadway shall not <br />• <br />Roadway shall not flood when adjacent to <br />• <br />flog(' when adjacent <br />to stormwater storage <br />• <br />flood when adjacent <br />• <br />.stormwater storage basin designed to store <br />to stormwater storage <br />the 100 -year storm event. <br />basin designed to <br />basin designed to <br />Freeboard requirement set by road <br />store -.th _100 -year <br />storm event. <br />store the t OQ -year <br />storm event. <br />authority, <br />Freeboard <br />Freeboard <br />requirement set by <br />reoujrctnent set by <br />road authority. <br />road authority. <br />c. For water bodies without a piped outlet: <br />The normal water Level or a water body without a piped <br />outlet shall be determined by a qualified licensed geologist or <br />hydrogeologist. A ground water analysis using existing or <br />installed monitoring wells on or near the site and soil <br />conditions in the basin shall be used. Ideally. the peak <br />> roundwater elevation over a continuous three -year <br />monitoring period shall be considered the normal water level <br />of a basin without a piped outlet provided soil conditions <br />allow Rill drainage of recent storm event within 48 hours. <br />For existing water bodies without piped outlets. tnottled soils <br />may be considered in establishing a water body's normal <br />water level in lieu of (groundwater analysis. <br />:ln emergency response plan shall be developed for <br />addressinggotential flooding in homes below the overlaid <br />emergency overflow Swale around each water body without a <br />piped outlet. The plans shall be adopted by the City and be <br />included in a maintenance agreement for the development, <br />d. For underrrround parkitur structures: <br />Underground parking structures shall be flood protected to <br />minimize impacts from high groundwater during flood <br />events. <br />All drainage structures within underground. parking shall <br />include an anti- backtlow device to prevent stormwater from <br />surcharging into the area. <br />Model Stonnwater Ordinance Page 10 NEMO Ordinance Project <br />- 1 4 - <br />