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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 />d. Rio Grande River <br /> <br />Flow in the Rio Grande River is measured about 6 miles upstream <br /> <br /> <br />from Del Norte, above major canal diversions such as the Rio Grande, <br /> <br /> <br />Monte Vista, and Farmer's Union canals, and also above the Pinos Creek <br /> <br /> <br />and San Francisco Creek tributaries. <br /> <br />The USGS gaging station records for the Rio Grande River gage at <br />Del Norte for the study period are complete and this gage was the <br />basis for much of the missing data interpretation and derivation. The <br />historic inflow was adjusted by subtracting the upstream inflow into <br />the three reservoirs to arrive at the Rio Grande River inflow at Del <br />Norte, and wi th thi s adjustment fl ow vol ume averaged 418,500 acre-feet <br />per year with a maximum of 702,100 acre-feet in 1986. <br /> <br />e. Other Tributaries <br /> <br />By utilizing flow records of the Rio Grande River at Del Norte, <br />thereby incorporating all upstream inflow and losses, the only major <br />tributaries affecting avail able irrigation water are Pinos Creek and <br />San Franci sco Creek. The confl uence of these streams are located <br />downstream of the USGS gage at Del Norte. Pinos Creek fl ow is gaged <br />by the USGS, and San Franci sco Creek fl ows were estimated from the <br />Pinos Creek gaging station by calculating basin areas and analyzing <br />historic precipitation for the two watersheds. The flows in the two <br />tributaries were summed for the operation study and averaged 23,000 <br />acre-feet per year wi th a peak of 52,000 acre-feet. <br /> <br />IV - 7 <br />