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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />The spill discharge estimates and the lOO-year floodplain for the FEMA Certified Levee <br />Condition in the vicinity of the Flatiron Property is shown on Figure 6. The floodplain <br />map for the certified flood levee condition indicates that approximately 82 of the 308 <br />acres of the Flatiron Property would be inundated during the lOO-year flood. <br />Approximately 48 of these inundated acres are at the south and southeast edge of the <br />property outside the flood protection levee and would remain in the 100-year floodplain <br />under both conditions 1 an 2. <br /> <br />The HEC-2 analysis indicates the South Boulder Creek flow regime adjacent to the berm <br />during the 100-year flood is flowing critical (Cross Sections 30030 through 30080). <br />Average velocities adjacent to the berm range from a low of 1.22 feet per second (fps) to <br />a high of 9.5 fps. <br /> <br />A comparison of main channel 100-year spill discharges found in the regulatory (G&O) <br />model to Condition 1 - "lOO-Year Floodplain Model - No Levee with 200-Foot Wide <br />Channel and Condition 2 - lOO-Year Floodplain Model - FEMA Certified Flood <br />Protection Levee are shown in Table 1 below. The results indicate the total volume of <br />100-year flood waters that split from the main channel of South Boulder Creek is greater <br />under Condition 1, No Berm Condition than under Condition 2, the FEMA Certified <br />Levee Condition. <br /> <br />-20- <br />