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I' I I I I I I I I I I I I I I I I I I 0- C', t\) . ~ ~ Mr. Steven J. Witte August 8, 1997 Page 2 November December January February March April May June July August September October ......................................... 9.9% 8.1% 8.7% 12.6% 21.3% 29.1% 34.8% 42.0% 45.3% 38.7% 29.4% 20.1% ......................................... ......................................... ......................................... . . . .. . . . . . .. . .. " . . .. . . . . . . . .. " . . . . . . . . . I modified our computer program used for the July 10 submittal to mimic the H-I model's calculations of lateral seepage and secondary evaporation. The deep percolation and net seepage were routed back to the river by a response function developed using Glover techniques which is consistent with the procedure used by Kansas to develop response functions for the Colorado ditches. The results of our analyses are summarized in Table 1 which is similar in format to the summary presented in our July 10 submittal. On an annual basis, the stream depletions amount to about 64.6 percent of the river diversion, and the monthly values range from 0.9 percent in February to 82.8 percent in August. The monthly values are very similar to the depletion rates presented in our July 10 submittal. In December and January, the return flow exceeds the diversion, i.e., net gain in streamflow. These monthly volumes represent 4.5 percent of the sum of the stream depletions in the other 10 months. In our July 10 submittal, the December through February river gain averaged 5.0 percent of the stream depletions in the other 9 months. Also shown is the amount of consumptive use, attributable to on-farm uses as a percent of the farm delivery. The consumptive U$e includes crop consumptive use, secondary evaporation aS$ociated with on-farm lateral$ and tail water, and change in soil moisture storage. The annual value averages 69.0 percent of the farm delivery, and the monthly values range from 63.7 percent in November to 70.0 percent in July. Until such time that a river gage is installed at the Highland Canal diversion dam, LAWMA's water will be delivered to the Purgatoire River through Wasteway NO.3. Accordingly, these percentages would represent the consumptive use when delivering water through this wasteway. The values presented above and in Table 1 are not substantially different from the values presented in our July 10 submittal. LAWMA has obtained ownership of 2,682 shares (about 71 percent of the outstanding shares) and anticipates purchasing 887 shares before next spring. At that time, LAWMA will own 3,569 shares out of 3,800 shares outstanding. The owners, which have sold their shares to LAWMA, have discontinued irrigation of the fields at the time of the closing. The purchase contracts -have provisions for revegetation and dry-up.