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<br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />0745 <br /> <br />17. Estimate:o~dischargE-. - Honthly and annual flm,s are avail- <br /> <br /> <br />able at the Trinidad gaging station for the period Jahuary IJ 1921, <br /> <br /> <br />through December 31, 1950. The published records in the Biennial Reports <br /> <br /> <br />of the Colorado State Engineer were used for the period January 1, 1921, <br /> <br /> <br />through September 30, 1933. The published records in the U.S. Geological <br /> <br /> <br />Survey Water-Supp1y Papers were used for the period October 1, 1933, <br /> <br /> <br />through December 31, 1950. The estimated flows at the Trinidad dam site <br /> <br /> <br />_(drainage area 698 square miles) were computed by applying the drainage <br /> <br /> <br />area ratio to the recorded flows at Trinidad (drainage area 795 square <br /> <br /> <br />miles) . <br /> <br /> <br />18. In order to check the esti.mated flows at the dam site, a study <br /> <br /> <br />was made by selecting the minimum (1934) and the maximum (1942) years <br /> <br /> <br />of runoff. The average monthly precipitation was computed for the water- <br /> <br /> <br />shed above Trinidad by using the precipitation stations located at North <br /> <br /> <br />Lake, Trinidad and Raton. The r1C.noff factor for each month was computed <br /> <br /> <br />from the average monthly precipitation and the recorded monthly flow for <br /> <br /> <br />the drainage area above the gage. The -assumption was made that these <br /> <br /> <br />runoff factors were indicative of the runoff for other portions of the <br /> <br /> <br />wa tershed above Trinidad. Proceeding ,,,i t:1 this hypothesis, the estimated <br /> <br /> <br />flow at the Trinidad dam site was cOl,'puted for the years 1934 and 1942 <br /> <br /> <br />by applying the monthly runoff factors to the average monthly precipita- <br /> <br /> <br />tion above.the dam site. The flow at the dam site was also estimated by <br /> <br /> <br />applying the monthly runoff factors to the average monthly precipitation <br /> <br /> <br />for the intervening drainage area of 97 square miles between the dam site <br /> <br /> <br />and the Trinidad gaging station. The monthly runoff values obtained for <br /> <br /> <br />the intervening area were deducted from the recorded monthly flows at <br /> <br /> <br />thE gage to obtain the monthly flows at the dam site. Comparison bfthe <br /> <br /> <br />results of this method to the flows obtained by the drainage area -method <br /> <br /> <br />indicated a maximum variation of p~us- or minus eight percen~- for tive <br /> <br /> <br />months out of the twenty-four. However, the annual flmm checked wi thin <br /> <br />18 <br /> <br />,APPENDIX B <br /> <br />