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<br />OJ1736 <br /> <br />In certain cases, unmeasured canal losses are distributed by river mile as in the case of the missed <br />canal measurement on Citizen Ditch at mile 209,10. <br /> <br />The mass balance on the river reach calculated the downstream reach flow by using the upstream <br />reach measured flow, diversions, irrigation return tlow, wasteway flow, M&I return flow, and <br />any tributary inflow, and calculated canal loss, Table 6 shows the calculations for the river <br />balance, It shows the order of diversions and return flows to the river in relation to the river <br />station by station number, river mile and description. It displays the values for diversions, return <br />flows and river losses and the resultant calculated river flow versus the measured river flow. <br />Lastly, it shows the estimated effect of releasing 250 cfs from Navajo Reservoir. River stations <br />values are displayed along with diversions, return flows and river losses in the analysis column <br />and the river flow at each diversion or return flow point are displayed in the Streamflow by River <br />Mile column. <br /> <br />Flows at the 9 river stations were calculated for the 250 cfs Navajo Reservoir release scenario by <br />substituting 250 cfs for the averaged measured 272 cfs that occurred at the USGS Archuleta gage <br />during the field test. All diversions, uses, losses and gains were assumed to be unchanged. The <br />only exception is for Citizen Ditch, The measured diversion for this ditch waS about 142 cfs. <br />This is apparently about 18 cfs less than their water right. It was assumed that the headgate <br />inflow would be increased from the measured 142 cfs to about 160 cfs. The canal was operating <br />at or near its maximum capacity at Station 16-Citizen Ditch behind Blanco Church during the <br />field test. Therefore, it was assumed wasteway 32 would return an additional 18,1 cfs to the river <br />below the Hammond Diversion. In any case, the flows (recorded during the test) in the reach of <br />river below Citizen Ditch Intake Diversion (mile 217.75) and some where below Hammond <br />Diversion could be reduced as much as about 40 cfs. <br /> <br />3 <br />