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<br />timing~nd pattern qf well pumping. However, as the dis- <br />tance between the well and river is increased, the timing of <br /> <br />depletions lag behind that of well pumping. Thus, pumping <br /> <br />of a well which is located at a relatively great distance <br />from the river may cause depletions to the streamflow for <br /> <br />several months or years after the actual pumping occurs. <br /> <br />As noted earlier, breaks in the slope of a doublemass <br /> <br />diagram indicate a change in the relationship between the <br /> <br />quantities massed. In comparing the upstream and downstream <br /> <br />I streamflows, a distinct break in the slope of the double <br /> <br /> <br />! <br /> <br />mass diagrams reflecting depletions from well development in <br /> <br />Colorado may not appear because of the following factors:. <br /> <br />a) Well development occurred over a multi-year <br /> <br />period; <br /> <br />b) Timing of well development above and below John <br /> <br />Martin Reservoir occurred in different patterns; <br /> <br />c) A majority of the Colorado wells are used as a <br />supplemental supply for irrigation. Their usage should be <br />expected to vary depending upon both climatic conditions and <br />._availability of water from surface supplies. During a <br />drought period, particularly during a multi-year drought, <br />the impact of wells on streamflows is expected to be more <br /> <br />pronounced; and <br /> <br />d) The depletive effect of ground water usage should <br />not be expected to coincide with well pumping. Pumping of <br />given a well may result in depletions several months 'or <br />years after the pumping occurred. <br /> <br />-23- <br />