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• Low opening must be Low opening must be Low opening must be a minimum of 2 feet <br /> a minimum of 2 feet a minimum of 2 feet above the 100-year flood or one foot above <br /> above the 100-year above the back to the emergency overflow elevation. <br />Underground flood elevation. back 100-year flood <br />Parking Structures elevation. <br /> • Roadway shall not Roadway shall not Roadway shall not flood when adjacent to <br /> flood when adjacent flood when adjacent stormwater storage basin designed to store <br /> to stormwater storage to stormwater storage the 100-year storm event. <br /> basin designed to basin designed to <br />Public Roadway store the 100-year store the back to back 2 foot Freeboard requirement <br /> storm event. 100-year storm event. <br /> • 2 foot Freeboard 2 foot Freeboard <br /> requirement requirement <br />c. For water bodies without a piped outlet: <br />(1) The normal water level of a water body without a piped <br />outlet shall be determined by a qualified licensed geologist <br />or hydrogeologist. Aground water analysis using existing <br />or installed monitoring wells on or near the site and soil <br />conditions in the basin shall be used. Ideally, the peak <br />groundwater elevation over a continuous three-year <br />monitoring period shall be considered the normal water <br />level of a basin without a piped outlet, provided soil <br />conditions allow full drainage of recent storm event within <br />48 hours. <br />(2) For existing water bodies without piped outlets, mottled <br />soils may be considered in establishing a water body's <br />normal water level in lieu of groundwater analysis. <br />(3) An emergency response plan shall be developed for <br />addressing potential flooding in homes below the overland <br />emergency overflow swale around each water body without <br />a piped outlet. The plans shall be adopted by the City and <br />be included in a maintenance agreement for the <br />development. <br />d. For underground parking structures: <br />(1) Underground parking structures shall be flood protected to <br />minimize impacts from high groundwater during flood <br />events. <br />Stormwater Ordinance 928- 11 <br />