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Lower San Miguel yVa~er Resource Planning Study Page 5 III.F Lower San Miguel River Water Resources Planning Study The current study, which was funded jointly between the CWCB and the SWCD, takes up where the Armburster Report left off. The purpose of this evaluation is to: 1) determine how to best utilize the Uravan Water Rights conveyed to, and to be conveyed to the CWCB to best meet instream flow needs and the needs of the local communities and water users with minimal impact to the basin, and 2) evaluate a possible water supply for the Uravan Ball Fields IV. Uravan Water Rights Historical Consumptive Use Analysis -Armbruster Report The Armbruster Report conducted a thorough investigation and analysis of the historical consumptive use of the Uravan Water Rights. Please consult the Armbruster Report for the analysis. The results of the analysis are presented here. No further analysis was conducted for this study. The information provided in the following subsections as well as that in Section V has been largely derived from the 2005 Armbruster Report. There has been no use of the Uravan ~Uater Rights since the completion of the Armbruster Report IV.A Miguel Power Company Canal Rights The San Miguel Power water rights were used for non-consumptive power generation purposes. Their diversion records are very spotty, and may not be a good representation of the actual diversions. According to Table 7 of the Armbruster Report, the recorded average daily diversion ranged from 0.2 cfs in 1943, to 160.0 cfs in 193 8. There were no diversions reported after 1974. The last recorded use of any significant quantity was 193 9 when 140.0 cfs was recorded as being used for 95 days. Since that time the record show small uses, i.e., 0.2 to 6.9 cfs for a period in the 1940s and a higher usage of 7.0 to 52.5 cfs in the early 1970s. Again, no consumptive use was associated with these uses. IV.B Johnson Ditch The Johnson Ditch Water Rights were originally decreed for irrigation. In 1956, these water rights were changed to include the year-round uses of domestic, milling, industrial, power, and other incidental uses. Table 12, of the Armbruster Report, summarizes the historical consumptive uses of these water rights as follows: Table 12 Estimated Historical Consum tive Use of the Uravan Water Ri hts Use T pe Consumptive Use c3~ (acre-feet per ear) Season of Use Irri ation 200 April to October Industrial ~2~ 350 Year-Round Notes: (1) Generally over the period 1891-1984 (April through October) (2) Generally over the period 1936-1984 (Year-Round) (3) Includes Johnson Ditch and Miguel Power Company Canal ~Iuly 2008