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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 />When total diversions in Water District 14 and 17 exceed the total outflow <br />from Pueblo Reservoir, this indicates that some ditches are diverting water derived <br />from return flows, and that Pueblo release water is fully diverted above John <br />Martin Reservoir. Depending on the pattern of return flows and re-use of water, <br />exchange might not be possible. In this instance, the Minimum Rate of Exchange <br />was assumed to be zero. The Probable Rate of Exchange was assumed to be <br />the rate of the lowest flow in the river between Pueblo Reservoir and John Martin <br />Reservoir. Since this minimum streamflow is derived in part from return flows, <br />a Maximum Rate of Exchange could be even higher. This is because a further <br />dimunition of Pueblo Reservoir outflow would not necessarily result in an equal <br />dimunition of the gaged low flow. To calculate this maximum rate, however, <br />would require a complexity of analysis beyond the scope of this report. <br /> <br />When Pueblo Reservoir releases exceed the total demand for water in Water <br />Districts 14 and 17, then two rates of exchange can be calculated: <br /> <br />1. the lowest flow in the river, and <br />2. the difference between Pueblo Reservoir outflow and the total demand <br />in Districts 14 and 17. <br /> <br />Depending on which is larger, these rates are assigned as "minimum" and "probable" <br />exchange rates. <br /> <br />When the lowest flow on the river was measured at the La Junta gage and <br />the Las Animas Consolidated Ditch was diverting, the low flow was assumed <br />to be 80 cfs less than the amount measured, to account for a possible ungaged <br />low flow below the Las Animas Consolidated Ditch headgate. <br /> <br />The results of this analysis are shown in Tables 1 through 10. These tables <br />list Pueblo Reservoir releases, lowest streamflow, total diversions in Districts <br />14 and 17, Minimum Rate of Exchange, and Probable Rate of Exchange. <br /> <br />-7- <br />