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• Board Meeting Date: 7/11/2007
• Description: ISF Section - Hat Creek Water Right Acquisition
• Board Meetings - Doc Type: Memo

< p, Fritz Holleman, Esq,
January 25, 2006
Page 4

4, A water budget shows tllat there was a full water supply available to the Hat Creek Ditch,
Using the diversion amounts for those years with diversions, 23 years, the historical
consumptive use averaged 35.4 acre-feet annually, The stream depletions, diversions
minus return flows, varied monthly during the irrigation season from 0.04 cfs in May to
0.31 cfs in June. In October and November, return flows exceed diversions so there is a
net accretion of 0.03 cfs and 0.02 cfs, respectively. The lag is caused by the factors used
to delay the ground water return flows, If years of non-use must be considered, the
historical consumptive use and stream depletions would have to be reduced by 41
percent.

5, The Hat Creek Ditch water right of 2.0 cfs could be used in its entirety for instream flow
purposes on Hat Creek, Most, if not all, the return flows from the Hat Creek Ditch
diversions accrued to East Brush Creek.

6. The use of the Hat Creek Ditch water right on East Brush Creek and Brush Creek would
be limited to the monthly net depletion rates or historical consumptive use rates, The
depletion amounts could be quantified and then carried downstream, less transit losses,
through the segments of East Brush and Brush Creeks,

Sincerely yours,

HELTON &. WilLIAMSEN, P.C.

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Thomas A. Williamsen

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Enclosure

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