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<br />pre-well period prior to 1950. The departure of <br />the accumulated stream flow values from the <br />projected straight line becomes more pronounced <br />the farther downstream the gaging station is <br />located. Id., p. 27. <br /> <br />The effects of well pumping on surface water diversions <br /> <br />~ <br /> <br />were also analyzed in the study using the mass diagram <br /> <br />'. <br /> <br />technique. Four canals, i.e., Excelsior Ditch, Rocky Ford <br />Highline Canal, Otero Canal, and Amity Canal, were selected <br />as being representative of the study reach. Graphs of the <br /> <br />five,year moving means and mass diagrams of diversions for <br /> <br />the ditches were constructed. The study found that "the <br /> <br />annual diversions at. the headgates of the four ditches have <br /> <br />decreased as indicated by the straight line on the mass <br /> <br />diagrams representing essentially the pre-well period prior <br />to 1950 compared to the declining values in the years subse- <br />quent to 1950." Id., p. 37. To further evaluate the <br />effects of well pumping on surface diversions, a plot of <br />the ratio of total diversions between Canon City and the <br />stateline to the flow at Canon City versus time was con- <br />stru~ted. This ,graph shows a general decline in the total <br /> <br />surface water diversions as compared to the flow at Canon <br /> <br />City from 1945 to 1972. <br /> <br />The study also made water budget calculations for the <br /> <br />years 1940 through 1972 to determine the net river gain <br />between Canon City and the stateline. The data presented in <br /> <br />Table 14 of the report show that after 1950 the streamflow <br /> <br />.at the stateline, total diversions between Canon City and <br /> <br />the stateline, and net river gain have decreased while <br /> <br />. groundwater withdrawals have increased. A mass diagram <br /> <br />-6- <br /> <br />,1. _ <br /> <br />., <br />