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Bulletin 118, which was first published in
1975. This update is the compilation of a four-year effort and is
referred to as 'Bulletin 118 Update 2003'. Bulletin 118 Update 2003
includes the written report and supplemental material consisting of
individual hydrogeologic descriptions, maps, and GIS compatible data
files of each delineated groundwater basin in California. The written
report is available in hard copy and is posted on this website. The
basin descriptions and maps are available only on the website. The
basin descriptions and maps will be updated as new information becomes
available. Basin descriptions are not published in the hard copy version
of Bulletin 118 Update 2003.
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Background
Despite California's heavy reliance on groundwater, basic information
for many of the groundwater basins is lacking. Particular essential
data necessary to provide for both the protection and optimal
use of this resource is not available. To this end, the California
Legislature mandated in the Budget Act of 1999 that the Department
of Water Resources prepare:
"... the statewide update of the inventory of groundwater
basins contained in Bulletin 118-80, which includes, but is
not limited to, the following: the review and summary of boundaries
and hydrographic features, hydrogeologic units, yield data,
water budgets, well production characteristics, and water quality
and active monitoring data; development of a water budget for
each groundwater basin; development of a format and procedures
for publication of water budgets on the Internet; development
of the model groundwater management ordinance; and development
of guidelines for evaluating local groundwater management plans."
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