June 18, 2007
1. Management
Objectives
The
District desires to maximize the long-term production potential and protect the
environmental quality of the Carmel River and Seaside
Groundwater Basins. In addition, the District desires to maximize
the amount of water that can be diverted from the Carmel
River Basin and injected into the Seaside Groundwater
Basin while complying with the
instream flow requirements recommended by the National Marine Fisheries Service
(NMFS) to protect the Carmel
River steelhead
population. To accomplish these goals, a
water supply strategy and budget for production within the California American
Water (CAW) main water distribution system is reviewed quarterly to determine
the optimal strategy for operations, given the current hydrologic and system
conditions.
2. Quarterly
Water Supply Strategy: July - September 2007
On
June 6, 2007, staff from the District, CAW, the California Department of Fish
and Game (CDFG), and NMFS met and discussed the proposed water supply strategy
and related topics for the remainder of June 2007 and the July-September 2007
period. Currently, flow in the Carmel River
is fully regulated and San Clemente Reservoir is being drawn down, as required
by the Division of Safety of Dams (DSOD).
Flow in the Carmel
River is discontinuous
below river mile 5.4, with dry reaches between river miles 3.3 and 2.5 and
river miles 5.4 and 5.2. For the first
eight months of Water Year 2007 (October 2006 through May 2007), rainfall at
San Clemente Dam in the upper watershed totaled 11.4 inches or 54% of the
long-term average at this site. Further,
runoff at San Clemente Dam in the upper watershed totaled 11,790 AF or only 18%
of the long-term average at this site.
Carmel
River Basin Given these conditions and
the assumption that “critically-dry” inflows (similar to flows that occurred in
Water Year 1990) are expected to occur during the July- September 2007 period,
it was agreed that CAW would divert no surface water from its San Clemente
Reservoir and would divert no more than approximately 30 AF of groundwater each
month from its wells in the Upper Carmel Valley. To meet customer demand, Cal-Am would operate
its wells in the Lower
Carmel Valley
in a downstream-to-upstream sequence, as needed. For the quarterly budget, it was agreed that
Cal-Am would produce approximately 1,208, 1,208, and 1,055 AF of groundwater
from its wells in the Lower
Carmel Valley
during July, August, and September 2007, respectively. Table 1
shows projected monthly releases and diversions from Los Padres and San
Clemente Reservoirs for the June through September 2007 period. As shown, water stored in Los Padres
Reservoir will be released in June 2007 to maintain downstream streamflow.
Seaside Groundwater
Basin It was also agreed that CAW would maximize
production from the Seaside Basin during the July - September 2007 period
consistent with the production limit specified in the 2006 Seaside Basin
adjudication decision. Specifically, it
was agreed that CAW would produce approximately 350 of groundwater from its
wells in the coastal subareas of the Seaside
Basin during July,
August, and September 2007, respectively.
Lastly, it was assumed that no water would be diverted from the Carmel River Basin
and injected into the Seaside
Groundwater Basin
during the July – September 2007 period.
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