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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />ZORICH, SPRONK a ASSOCIATES, INC. <br /> <br />Page 9 <br /> <br />river diversions, The number of large capacity wells which <br />"') <br />pump from the Arkansas River alluvial aquifer has also increased <br />N <br />~ substantially since 1950. Whatever the reasons, it is evident <br />... <br />N that a relatively larger portion of the river flow has been <br />consumed in Districts 14 and 17 since the time the Compact was <br />adopted. Of further concern is the effect on District 67 ditches <br />of the winter storage program which has operated the last several <br />years, and is not reflected in this analysis. <br />SUHMARY <br />New operating criteria for John Hartin Reservoir have prompt- <br />ed an analysis of the effects of past administration of the <br />Arkansas River Compact, Basic ditch diversion and river discharge <br />data have been analyzed in order to compare the benefits received <br />by ditches in Districts 14 and 17 with those received by the <br />District 67 ditches due to the construction of John Hartin Re- <br />servoir and implementation of the Compact. <br />The annual diversions made by the combined District 67 <br />ditches were compared with those made by the Fort Lyon Canal <br />during the time periOdS prior to (1908 to 1949) and after (1950 <br />to 1978) adoption of the Compact. The Fort Lyon Canal was chosen <br />for this comparison because it is typically the "swing ditch". <br />Therefore, the amount of water diverted by the Fort Lyon Canal <br />is indicative of the effect of Compact administration on upstream <br />ditches, <br />The annual Fort Lyon Canal diversions decreased by 2.8 per- <br />cent from a pre-Compact average of 223,264 acre-feet per year <br /> <br />, <br />