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<br />o <br />!:'- <br />C'J <br />, ,~) <br />(7,) <br />[~....:.:.\ <br /> <br />summer, A few rec~rds exist for some stages during the winter period. <br /> <br />Fairly continuous records exist from 1911 for the runoff of streams <br /> <br />rising in the same mountain range as the Costilla and in the same general <br /> <br />vicinity, These include the Rio Taos, Rio Hondo, and Rio Colorado, <br /> <br />The water supply of the Costilla River at Costilla was estimated <br /> <br />on the basis of correlation found to exist between the runoff of the <br /> <br />Costilla at that point and the runoff of the adjacent streams during the <br /> <br />period when records existed for the runoff of both streams, The curves <br /> <br />showing the annual relation between the runoff of the Costilla and ad- <br /> <br />jacent streams are shovm on drawing No, CC-2, The detailed estimates of <br /> <br />the monthly rtmoff of the Costilla were made from the CUrve showing the <br /> <br />correlation between the runoff of the Costilla and the Rio Taos at <br /> <br />Cordova, This relationship is shown on dra~~ng CC-3, The runoff during <br /> <br />the summer months during the period when no record existed was determined <br /> <br />from this drawing, <br /> <br />Drawing !fo, cc-4 shows the relation between the sUIll1ller runoff <br /> <br />and the annual runoff of Costilla Creek at Costilla, The winter rQ~off <br /> <br />for the period of no records was estimated from this dra1ving using the <br /> <br />estimate of the summer runoff as determined from drawing No. CC-3. <br /> <br />Drawing No, CC-5 shows the relation bet1vaen discharge of <br /> <br />~ <br />t <br /> <br />Costilla Creek at the Costilla gaging station and at the gaging station <br /> <br />" <br /> <br />located below the reservoir. From this drawing was estimat ed the dis- <br /> <br />charge of the river below the reservoir under natural flow conditions, <br /> <br />All of the curves showing correlation bevNeen the flm~ of Costilla Creek <br /> <br />and other streams are on the basis of the natural flow of Costilla, that <br /> <br />is, the recorded flow corrected for change in stage of Costilla Reservoir, <br /> <br />- 8 - <br />