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. 002535 . A. Mountain Inflow. While the amounts of tributary inflo.... and ground....ater pumping ....ere sharply contested during the trial. the t....o states essentially agreed upon the mainstream supply at Pueblo. Kansas computed the average annual flow to be 585,157 acre-feet for the 1950-85 period. while Colorado put the average at 582,805. Colo. Exh. 831.ul The difference over this period of time is not material for the issues in this case. Most of this water comes from melting snow, and the flows are largest during the spring and early summer. Winter flows are relatively low. Precipitation downstream of Pueblo averages only 12 inches a year, although it increases toward the east and into Kansas. Colo. Exh. 379; Jt. Exh. 105 at 7. Eighty percent of the precipitation occurs during the growing season of April through October, but without irriga- tion, rainfall is not sufficient to mature crops. Jt. Exh. 105 at 7. III These figures can be compared with longer-term averages at Canon City, where the river emerges from the mountains. An engineering committee report prepared for the compact negotiations shows an average annual flow at Canon City of 502,300 acre-feet for the period 1908-42. Jt. Exh. 5, Table D at 16. A 1968 Colorado report computes the Canon City annual average at 518,000 acre-feet for the years 1924-66. Jt. Exh. 92 at i. Another Colorado report done in 1975 estimates the 1935-50 average annual flow at 509,400 acre- feet, and the 1951-72 average at 513,600 acre-feet. Jt. Exh. 94 at 49, There is unexplained evidence, however, that Colorado used an annual average flow for Pueblo of only 481,717 acre-feet in its water budget analysis. Colo. Exh. 4 at A.1; RT Vol. 101 at 82. And in its opening post-trial brief, Kansas states that the mean annual flow at Pueblo is 479,600 acre-feet for 1949-85. At 6, citing Kan. Exh. 23.. ~L1366n - 55-