OCWD Management Area
Figure 9-3: Deep Aquifer Water Level Change, June 2020 to June 2021
9.4 DEFINITION OF SIGNIFICANT AND UNREASONABLE LOWERING OF GROUNDWATER LEVELS
OCWD closely monitors groundwater levels in the three major aquifer systems (Shallow, Principal and Deep) for a number of purposes including determination of groundwater storage within the basin. OCWD uses groundwater storage conditions to manage the basin sustainably by keeping storage levels within an operating range up to 500,000 acre-feet below full condition. Significant and unreasonable reduction of groundwater in storage could occur in the event that the volume of groundwater in storage fell below the 500,000 acre-feet below full condition for an extended period of time. If OCWD were to consider an operating range below 500,000 acre- feet from full condition, additional analysis and monitoring would be needed.
2017 BASIN 8-1 ALTERNATIVE
Sustainable Management: Groundwater Levels 9-5
Appendix F - 153
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