Sea water has already invaded or is an immediate or potential danger in at least 80 major and minor ground‐water basins in California. Of this total, there is definite evidence of intrusion into 13 basins and immediate danger exists in seven additional basins. Where the normal seaward hydraulic gradient has been reversed for protracted periods of time, sea‐water intrusion has occurred. Possible methods of control to restrain encroachment or reduce the area already affected include: (1) raising of ground‐water levels to or above sea level by reduction or rearrangement of pattern of pumping draft, or both; (2) direct recharge of overdrawn aquifers to maintain ground‐water levels at or above sea level; (3) maintenance of a freshwater ridge above sea level along the coast; (4) construction of artificial subsurface dikes; and (5) development of a pumping trough adjacent to the coast. The California Legislature has appropriated $750,000 for an experimental program to determine design criteria for the prevention and control of sea‐water intrusion.
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