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<br />r . Low opening must be . Low opening must be . Low opening must be a minimum of2 feet <br />Underground a minimum of 2 feet a minimum of 2 feet above the JOO-year flood or one foot above <br />Parking above the IOO-year above the JOO-year the emergency overflow elevation. <br />Structures""* flood elevation. flood 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 desigoed to store <br /> to stormwater storage to stormwater storage the IOO-year storm event. <br /> basin desigoed to basin desigoed to <br /> store the IOO-year store the JOO-year . Freeboard requirement set by road <br />Public Roadway storm event. storm event. authority. <br /> . Freeboard . Freeboard <br /> requirement set by requirement set by <br /> road authority. road authority. <br /> <br />1. <br /> <br /> <br />ody without a piped outlet <br />alified icensed geologist or <br />water analysis using existing or <br />n or near the site and soil <br />be used. Ideally, the peak <br />over a continuous three-year monitoring <br />ered the normal water level of a basin <br />t, provided soil conditions allow full <br />ent storm event within 48 hours. <br /> <br />(2) * For water bodies without a pipe <br /> <br />11. <br /> <br />water bodies without piped outlets, mottled soils <br />idered in establishing a water body's normal water <br />u of groundwater analysis. <br /> <br />iii. An emergency response plan shall be developed for addressing <br />potential flooding in homes below the overland emergency <br />overflow swale around each water body without a piped outlet. <br />The plans shall be adopted by the City and be included in a <br />maintenance agreement for the development. <br /> <br />(3) **F or underground parking structures: <br /> <br />i. Underground parking structures shall be flood protected to <br />minimize impacts from high groundwater during flood events. <br /> <br />11. All drainage structures within underground parking shall <br />include an anti-backflow device to prevent stormwater from <br />surcharging into the area. <br /> <br />06/12/2006 CRWD DRAFT <br /> <br />19 <br />