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f <br /> approximately 3,190 cfs leaves the main channel of South Boulder Creek and discharges <br /> onto the southern portion (South Overflow) of the Flatiron Property, between Cross <br /> ' Sections 30060 and 30080, see Figure 5 for delineation of these flows and the resulting <br /> 100-year floodplain. <br /> In addition, the main channel of South Boulder Creek will overflow (Main Channel <br /> ' Overflow) to the west at US Highway 36 running parallel with U.S. 36 on the northern <br /> edge of the Flatiron Property. The "no berm with 200-foot channel' HEC-2 analysis <br /> indicates approximately 490 cfs will discharge to the west along U.S. 36. The spill <br /> discharge from the South Overflow (those floodwaters which enter the Flatiron Property <br /> at the southeast comer of the property and are intercepted by the interceptor channel) of <br /> 3,190 cfs meets the U.S. 36 spill of 490 cfs, and the resulting backwater results in a spill <br /> of about 530 cfs through the opening at the RTD Park-N-Ride facility. The overflows <br /> (both South Overflow and Main Channel Overflow) continue west and northward and <br /> exit at a low point in U.S. 36 discharging an additional 3,150 cfs towards Apache Road, <br /> ' at Cross Section 90. The spill discharge estimates and the 100-year floodplain for <br /> Condition 1, in the vicinity of the Flatiron Property, is shown on Figure 5. Under the <br /> ' "No Berm - with 200-foot Channel' floodplain condition, approximately 113 of the 308 <br /> acres of the Flatiron Property would be inundated during the 100-year flood. <br /> Approximately ten (10) acres of the property inundated by the floodwaters under <br /> Condition 1 could be removed from the floodplain by widening the interceptor charnel at <br /> ' the point of entrance into the property to accommodate the flood flows entering the site <br /> at this location. The HEC-2 hydraulic model for Condition 1 is found in the Technical <br /> Appendix of this report. <br /> ' -15- <br />