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<br />I <br />I <br />I <br />t <br />I <br />t <br />t <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 />0:2148 <br /> <br />general trend line beginning In the early 1950's. From this method <br />of analysis, It was determined that the August and September diversions <br />were decreased during these latter years by approximately 30 percent. <br />Studies of other months and other major canals showed a similar pattern. <br />As a check on the validity of this analysis, a double mass curve of <br />the August diversions of the Fort Lyon Canal was plotted against the <br />accumulated August discharges of the Arkansas River near Pueblo, and <br />this Is shown on Exhibit D. The same conclusion was drawn from the <br />double mass curve as was Indicated by the single mass curve. <br />Beginning at the bottom of Page 7 of the report are two <br />short paragraphs which cover multiple regression studies. Five basic <br />studies developing 61 different relationships of natural occurrences <br />In the Arkansas River Basin were developed on a digital computor. <br />Questions which might be asked regarding the analyses we <br />made might Include the following: <br /> <br />1. What is the multiple regression analyses? <br /> <br /> <br />2. Why is it used? <br /> <br /> <br />3. What does It prove? <br /> <br /> <br />4. What ingredients are Involved? <br /> <br /> <br />5. Why should they be used In any analysis of the <br /> <br /> <br />Arkansas River Basin water studies? <br /> <br /> <br />6. What kind of results do you expect? <br /> <br />The results of one of the 61 relationships computed by the <br /> <br /> <br />regression analyses is shown on Exhibit E. This study is of return <br /> <br /> <br />flow or accretions to the stream In the reach between Pueblo and <br /> <br /> <br />La Junta. In the left column under Variable No., there are numbers <br /> <br /> <br />from I to 17, each of which Identifies a natural occurrence which <br /> <br /> <br />may affect the return flow to the stream. Some of the natural <br /> <br /> <br />occurrences included In this particular relationship are precipitation, <br /> <br /> <br />seepage losses from canals, irrigation water applied in excess of the <br /> <br /> <br />consumptive use of irrigation water, nonbeneflclal consumptive use <br /> <br /> <br />of Irrigation water and well pumpage. It Is elementary that all of <br /> <br /> <br />these Items have a bearing to some degree upon the return flow In any <br /> <br />-6- <br />