PROJ01918 ‎(2)‎

• Contract/PO #: FS0077FX
• Contract Type: Grant
• Water District: 0
• Loan Projects - Doc Type: Feasibility Study

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Conclusions

Analyses of water inflow~ and decreed water rights f~JJeroux Creek showed that water is over
allocated. If all decreed water rights senior to the GMWCb'condftional w~ater iightwere-~~---
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claimeo, then the amount of water remaining for storage is very small. This result was reached
through analyses of both monthly and daily data. The monthly analyses between the years of
1970 and 2001 indicated that an average of 1,000 acre-feet is transferable from Leroux Creek
and an average of 1,700 acre-feet is transferable from Leroux Creek with the addition of Cow
Creek. Analyses of daily data for 1948 and 1949 showed that an average of 1,000 acre-feet is
transferable from Leroux Creek and 1,400 acre-feet is transferable from Leroux Creek with the
addition of Cow Creek.

()

Diversion records confirmed that actual water diversions are less than decreed water rights. As a
result, there is unused water during the months of April, May and June. Analyses of monthly
data for the period 1970 to 2001 showed that the average total unused volume is about 13,000
acre-feet. Analyses of daily data for 1948 and 1949 showed that the a~e unused volume is
about 14,000 acre-feet. These two years are average y~rs (normal flow years), therefore,
unused water dlii1i1gthese two years was similar to the average.

A storage reservoir could be used to store unused flows during wet months. Due to the high
variability of runoff from Leroux Creek, the actual annual yield of any storage facility will be
less than 15,000 acre-feet. A storage reservoir with a capacity of 15,000 acre-feet would have an
average annual yield of 7,200 acre-feet. Increasing this capacity to 25,000 acre-feet will result in
an average annual yield of 11,500 acre-feet.

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