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<br />I <br />I <br />t <br />t <br />t <br />t <br />, <br />I <br />I <br />t <br />t <br />, <br />,t <br />I <br />t <br />t <br />t <br />t <br />t <br /> <br />~ <br /> <br />OC2147 <br /> <br />Human factors Influence the beneficial use of water and this <br /> <br /> <br />extends down to the individual farmers. There is no question but <br /> <br /> <br />that many farmers attempt to Irrigate with too long of runs. This <br /> <br /> <br />results In excessive loss of water at the upper end of the runs and <br /> <br />leaches nutrients from the soil profile. Another human element <br /> <br />Involved is that the irrigation of rough land requi res much more <br /> <br /> <br />water than does properly leveled land. These are some of the factors <br /> <br /> <br />involved in Irrigation In the Arkansas River Basin, which in my <br /> <br /> <br />opinion, will be difficult to resolve by legislation. These <br /> <br /> <br />present practices must be included in any basin study because we will <br /> <br /> <br />never have perfect farming operations. <br /> <br />The natural hydrologic regime of the Arkansas River has <br /> <br /> <br />continuously changed throughout many years due to man made works. <br /> <br /> <br />One change that has taken place has been the construction of and <br /> <br /> <br />use of the John Martin Dam and Reservoir. The reservoir has Increased <br /> <br /> <br />the water supply to canals below it because of storage releases and <br /> <br /> <br />above It by reducing calls needed to supply canals below the reservoir. <br /> <br /> <br />To determine whether the water supply received at the head- <br /> <br /> <br />gates of the various ditches has changed In the recent years, a single <br /> <br />mass diagram of the total diversions was plotted as shown on Exhibit C <br /> <br /> <br />for the period 1943 through 1965. The lower curve indicates the winter <br /> <br /> <br />diversions only and, as shown by the line, there Is no appreciable <br /> <br /> <br />change during this time period. . The upper curve shows summer <br /> <br /> <br />diversions only and a straight line cannot be drawn through the points <br /> <br /> <br />as In the case of winter diversions. It Is concluded that the average <br /> <br /> <br />summer diversions have decreased beginning about 1952. <br /> <br />Mass diagram tests were applied to individual canals. For <br /> <br /> <br />the purpose of this presentation only the Fort Lyon Canal was used to <br /> <br /> <br />demonstrate the water supply characteristics since 1943. The Fort <br /> <br /> <br />Lyon Canal has a number of junior decrees and almost always has a <br /> <br /> <br />shortage of water supply. Single mass diagrams covering diversions <br /> <br /> <br />In August and September for the years 1943 through 1965 were developed. <br /> <br /> <br />Inspection of these diagrams revealed a noticeable deviation from the <br /> <br />-5- <br /> <br />...~ <br />