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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 />II <br /> <br />ANALYSIS OF EXCHANGE POTENTIAL <br /> <br />In order to examine the potential for upstream exchange, call records were <br />used to identify periods during which the calling ditch was located in Water District <br />67, or when the John Martin Reservoir "1948 call" was in effect. During these <br />periods, stream flow records and ditch diversion records were examined to estimate <br />the potential rate of upstream exchange. The data used in this analysis are <br />described below. <br /> <br />Call Records <br /> <br />The Division Engineer has maintained records of calls on the Arkansas River <br />beginning in 1967. So that a representative call history could be examined, only <br />the years 1974 through 1983 were examined. Years prior to 1974 were not <br />considered to be valid since Pueblo Reservoir was not in existence. The years <br />1984 and 1985 were unusually wet and do not add to our understanding of more <br />typical Arkansas River operations. <br /> <br />Streamflow Records <br /> <br />For those days on which the calling ditch was in Water District 67, or the <br />1948 John Martin "call" was in effect, streamflow records were collected for <br />each gaging station between Pueblo Reservoir and John Martin Reservoir. The <br />total releases from Pueblo Reservoir and the lowest river flow at any gage were <br />tabula ted. <br /> <br />Ditch Diverion Records <br /> <br />For the identified call dates, ditch diversion records in Water District 14 <br />and 17 were collected and summed to determine the total demand between Pueblo <br />Reservoir and John Martin Reservoir. <br /> <br />Method of Analysis <br /> <br />A simplified river accounting method was used to estimate, the rate of <br />upstream exchange. On each day in which an exchange opportunity was identifed, <br />a Minimum Rate of Exchange and a Probable Rate of Exchange were calculated. <br /> <br />-6- <br />