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I I I I I I I I I I I I I I I I I I I B. Historical Consumptive Use of the Keesee Water Rights. Historical consumptive use of the Keesee Ditch was derived for this study from the H-I Model's output and efficiency factors for the period of1950 to 1994. Values obtained from the 1996 "Compact Run" version of the H-I Model include acres, simulated river headgate diversions, total crop evapotranspiration, and effective precipitation. Canal loss was calculated as 3.3% ofriver headgate diversions with a 3.5% off-farm lateral loss and 3.5% on-farm lateral loss. As shown in Table 2 the average annual consumptive for all of the Keesee water rights was 3,201 acre-feet (1,600.5 acre-feet for one-half of the Keesee water rights) during 1950-94 with a firm annual consumptive use of2, 123 acre-feet (1,061.5 acre-feet for one-half of the Keesee water rights) in 1951 and a maximum consumptive use of 4,294 acre-feet (2, 147 acre-feet for one-half of the Keesee water rights) in 1974. The average annual consumptive use of 3 ,522 acre-feet (1,761 acre-feet for one-half of the Keesee water rights) during 1980-94 represents the historical operations under the 1980 Operating Agreement for John Martin Reservoir. The firm and maximum annual consumptive use during this period was 2,593 acre-feet (1,296.5 acre-feet for one-half of the Keesee water rights) in 1993 and 4,235 acre-feet (2,117.5 acre-feet for one-half of the Keesee water rights) in 1988 respectively. C. Inflows to the Keesee Article II Storage Account. As previously mentioned, the Keesee water rights have storage available in the Article II Account System within John Martin Reservoir and one-half of the deliveries made to the Keesee Article II Storage Account would be available for LA WMA to use as a replacement source. Inflows to the Keesee Article II Storage Account in John Martin Reservoir are shown on page 3, column 5 of Table 3. This water may be delivered to the Offset Account at LA WMA's discretion or released to the river for replacement purposes. The average annual consumptive use factor of 64.9%, which is based on the average monthly water balance for the Keesee water rights, would be used to determine the replacement credits for that water. D. LA WMA's Need for Additional Replacement Water. As the CWCB is aware, the final phase of the Kansas v. Colorado litigation was completed earlier this year and LA WMA's participation in that litigation, although necessary, was very expensive and is discussed in more detail in Section VLB. of this study. That litigation, and its potential outcome, has forced LA WMA to take a closer look at its replacement water sources and the adequacy of those sources for meeting LA WMA's replacement requirements especially during a series of dry years such as the ones recently experienced in Colorado. During the final phase ofthe trial the Special Master made it clear that LA WMA' s continued and expanded use of the Offset Account in John Martin Reservoir would be critical to insuring Colorado's compliance with the Arkansas River Compact now and in the future. Furthermore, the extreme state-wide drought that peaked in 2002 - 2003 has also forced LA WMA to take a closer look at the adequacy of its replacement water sources. For example, 6