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'I ~ I I I I I I I P I I I I I I Table 2.1 Historical flow supplies and demands, in acre-feet Loca t ion Volume Water supplied to irrigation systew Gunnison River (through Tunne6) Uncompahgre River (at Colona) Water demands supplied by South Canala AS Lateral demands Cedar Creek wasteway West Canal Other lateral demands 336,411 168,685 18,112 11 ,017 49,177 22,453 Water demands supplied by Uncompahgre Rivera Montrose & Delta Canal 163,326 Loutzenhizer Canal 42,925 Selig Canal 60,081 Ironstone Canal 102,309 East Canal 45,868 Garnet Canal 21,307 Non-UVRP between Colona & Selig Can.c 22,437 Sources: a. UVWUA records b. Reclamation c. Est i mated ( i L. L. Flows are diverted into the AB Lateral between the Tunnel portal and the gauging station. This lateral is a small, unlined channel which flows northwesterly direction about five miles, where it discharges into the Loutzenhizer Wash. The lateral provides irrigation water to about 4,000 acres along the east edge of the UVRP (see Appendix A). Additional flows are diverted from this lateral into the Cedar Creek Wasteway. The wasteway is actually Cedar Creek, a small tributary of the Uncompah9re River. The purpose of this diversion is to convey additional flows into the river to meet irrigation demands downstream of the Selig Canal. Historically, flows diverted through the wasteway (see Appendix A) have been quite small in comparison to the total flow in the South Canal. Downstream from the gauging station, flows are diverted from the South Canal into the West Canal, which is described in subsequent sections of this report. Other diversions are made into smaller laterals which irrigate about 3,000 acres adjacent to the canal. These diversions are recorded, although long-term records are not available. Estimates of flow diverted into these laterals were made using ditch rider records provided by the UVWUA. Six years of records were available (see Table 2.2). Added to these flows are estimates of losses due to seepage and evaporation from the South Canal (assumed to be equal to the lateral demands), and estimates of diversions made for the Project 7 Water Treatment facility. For the latter quantity, an average diversion of 5,792 acre-feet per year was assumed. - 2.5 - ~" . i-'.:- ......