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<br />the CoLorado State Engineer acknowledges the impact of wells <br />on surface diversion by approving the plan for augmentation. <br />~hile the plan ostensibly augments depletion in Colorado, no <br />provision is made for the depletion of streamflow caused by <br />the augmentation wells and their ensuing impact on stateline <br />flows. There is no provision in the plan to replace the <br />depletion caused by the augmentation wells, and it is <br />reasonable to assume that the pumping of these augmentation <br />wells directly impacts stateline flows. <br />Single and Double Mass Analyses was a Preliminary overview <br />With these and 9ther studies in mind, Kansas agreed at <br />the Committee's meeting on May 7, 1985, in Denver, to <br />undertake a preliminary overview of the regimen of the river <br />by means of a series of single and double mass analyses. It <br />was contemplated that when the initial work program was <br />completed a decision would be made as to what further <br />engineering analyses, if any, would be prudent. <br />In regard to the utility of single and double mass <br />analyses, the states agree that the 1960 U.S.G.S. paper <br />entitled "Double Mass Curves" accurately describes the <br />theory and technique of using mass diagrams to analyze <br />'streamflow data. Basically, a mass diagram or curve can be <br />used to identify longterm changes in streamflow or in the <br />case of a double mass diagram changes in the relationship of <br />streamflow between two locations in a basin. According to <br />the U.S.G.S., "the theory of the double-mass curve is based <br />on the fact that a graph of the cumulation of one quantity <br />. against the cumulation of an other quantity during the same <br />-11- <br /> <br />~ <br />