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Exhibit 3 (cont'd). COLORADO RIVER DECISION SUPPORT SYSTEM (CROSS) <br />Historic Data Extension Feasibility. <br />Streamtlow and climate gages used in the Water Resources Planning and CU Models. <br />Colorado River Basin <br />Streamflow <br /> No. of gages <br />Data Extension Date with data to ext. date' <br /> <br />1960 41 53 <br />1950 34 44 <br />1940 25 32 <br />1930 12 15 <br />1920 10 13 <br />1910 10 13 <br /> Total gages in model: 78 <br />Precipitation <br />No. of gages <br />Data Extension Date with data to ext. date' °lo <br />1960 11 85 <br />1950 10 77 <br />1940 3 23 <br />1930 3 23 <br />1920 3 23 <br />1910 3 23 <br /> Total gages in model: 13 <br />Temperature <br />\ro. of gages <br />Data Extension Date with data to ext. date' <br />1960 9 75 <br />1950 7 58 <br />1940 3 25 <br />1930 3 25 <br />1920 3 25 <br />1910 3 25 <br />Total gages in model 12 <br />`The gage record may no[ be complete from the current calibration period (197 - 199 f) to the extension date. Gages were chosen based on <br />whether they had data from the extension date before, to, or beyond the calibration period. <br />Appendix E E-37 <br />