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<br />estimate of approximately 150 cLlbic feet per second to an upper envelope <br /> <br />discharge estimate of approximately 10500 cubic feet per second. This span <br /> <br /> <br />involves almost 2 ~ I09~~ and almost 7,000% variation in discharge <br /> <br /> <br />estimates for the same drainage area. <br /> <br />Figure 2 shows the 100 year recurrence interval flood estimates for 202 <br /> <br />sites in the Arkansas River Basin with hand-drawn upper and lower maximum <br /> <br />discharge envelope curves. For basins with a drainage area of 10 sqLlare <br /> <br />miles, the discharge varies from a lower envelope discharge estimate of <br /> <br />approximately 250 cubic feet per second to an upper envelope discharge <br /> <br />estimate of approximately 15000 cubic feet per second. This span also <br /> <br />involves almost 2 fLlll log ttIWt!l and about 6,000% variation in discharge <br /> <br />estimates for the same drainage area. <br /> <br />Figure 3 shows the 100 year recurrence interval flood estimates for 5 <br /> <br />sites in the Rio Grande Basin. Due to the limited number of data points no <br /> <br />conclLlsion can be made. It is interesting to note that for the 4 basins with <br /> <br />a drainage area of between 1200 and 1700 square miles, the discharge varies <br /> <br />from :~~ estimateiof 10,700 <br />~~~, ' <br />12,600 cubic feet per second. <br /> <br />cLlbi c feet per second to <br /> <br />discharge estimates for a 40% <br /> <br />This involves about a 20% variation in~ <br />variation in drainage area. ~ <br /> <br />Figure 4 shows the 100 year recurrence interval flood estimates for 311 <br /> <br />sites in the Colorado River Basin with hand-drawn upper and lower maximum C? ~ <br /> <br />.-7 <br />(fJQ <br /> <br />discharge envelope curves. For basins with a drainage area of 10 square <br /> <br />miles, the discharge varies from a lower envelope discharge estimate of <br /> <br />approximately 105 cubic feet per second to an upper envelope discharge <br /> <br />estimate of approximately 10,000 cubic feet per second. This span involves <br /> <br />about 2 log units and almost 9,500% variation in discharge estimates for the <br /> <br />3 <br />