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HANSEN PARK 10 <br /> <br />Stage (NAVD88) <br />Discharge (cfs) <br />Rainfall Event Existing Condition Proposed Condition Difference <br />2-year, 24-hour 166 149 -17 <br />10-year, 24-hour 266 223 -43 <br />100-year, 24-hour 397 343 -54 <br /> <br />5.3 FEMA CONSIDERATIONS <br />The area directly adjacent the Hansen Park pond is currently designated as a FEMA floodplain, Zone AE <br />per Map Panel 27123C0012G as shown in Figure 2 below. The flood insurance rate map (FIRM) states a <br />100-year flood elevation of 884.8 for the site. However, the RCWD has developed very detailed hydrology <br />and hydraulics modeling for the watershed to Hansen Park which indicates a 100 year, 24-hour rainfall <br />peak flood elevation of 881.01 under existing conditions, and 880.92 under post-project conditions. This <br />results in a substantially reduced floodplain extent as shown in Figure 3 below. <br /> <br />The Hansen Park pond is located in a designated floodway. Although fill will placed on site in portions of <br />the designated floodway, substantially greater quanties of cut will be required, with a net overall balance <br />of 28,552 CY (bank yards) removed from the site. <br />