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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 />20+65) was determined to be the approximate location at which the flow splits into four <br /> <br />separate directions. After the rating curves at cross section #8 for each split flow model <br /> <br />were determined, the energy grade (EG) elevation versus discharge at cross section #8 was <br /> <br />plotted for each split flow model as well as for the composite model used before the split <br /> <br />flow models were constructed. Using the composite model curve, the 10, 50, 100, and 500- <br /> <br />year discharges were located on the graph. The discharges for the individual flow splits <br /> <br />MOON GULCH <br />Lower Reach Split Flow Analysis <br />AT CROSS SECTION NO.8 (STA. 20+65) <br /> <br />were then determined from the EG versus discharge curve for each flow split. The graphs <br /> <br />(Braun Ct.) is 1400 cfs, and the discharge for the west split (Cole and Coors Cts.) is 510 cfs. <br /> <br /> 5510 <br /> 5509 <br />g 5508 <br />z 5507 <br />0 <br />~ 5506 <br />w <br />-l 5505 <br />w <br />C) <br />w 5504 <br /> 5503 <br /> 5502 <br /> 0 <br /> <br />Main Stem <br />(BEECH ST. & CT.) <br /> <br /> <br />~ <br /> <br />of EG versus elevation for the split flow analysis are found in Figure 5. For example, as <br /> <br />Figure 5 shows, the total 100-year discharge for Moon Gulch at cross section #8 (station <br /> <br />20+65) is 2600 cfs at an energy grade elevation (EG) of 5505.4 feet. At this EG elevation, <br /> <br />the discharge for the main stem split (Beech S1.) is 670 cfs, the discharge for the center split <br /> <br />Once the discharges for each flow split were developed, the discharges were input into each <br /> <br /> <br />West <br />Center (BRAUN CT.) <br /> <br />(COORS & <br />COLE CT.) <br /> <br />The flows for the remaining frequencies of interest can be determined in the same manner. <br /> <br />individual HEC-2 model to determine the water surface elevations along the individual <br /> <br />Composite <br /> <br />streets due to the split flow. The floodplain was delineated as shown on Sheet #3 of the <br /> <br />FHAD maps. <br /> <br />500 <br /> <br />1000 1500 2000 <br />DISCHARGE (cfs) <br /> <br />2500 <br /> <br />3000 <br /> <br />Figure 5 - Split Flow Analysis Below 72nd Avenue <br /> <br />-18- <br /> <br />-19- <br />