OCWD Management Area
* Due to impacts from COVID-19 FY 2018-19 groundwater production was chosen to be representative of typical pumping patterns. Figure 3-8: Groundwater Production, WY2018-19
3.2.3 Long-Term Groundwater Elevation Hydrographs
Groundwater elevation trends exhibit both short-term (seasonal) and long-term fluctuations. Seasonal elevation changes reflect short-term variations in pumping and recharge, while multi- year trends reflect the effects of extended periods of above- or below-average precipitation and/or availability of imported water. OCWD measures elevations in three principal aquifer systems. In general, groundwater elevations in the Shallow Aquifer system show less amplitude than those in the underlying Principal and Deep Aquifer systems due to the higher degree of pumping and confinement of the Principal and Deep Aquifer systems. Because approximately 95 percent of all production occurs from wells screened within the Principal Aquifer system, groundwater elevations within this system are typically lower than those in the overlying Shallow Aquifer system and, in some areas, the underlying Deep Aquifer system. As a result, vertical gradients created by pumping
BASIN 8-1 ALTERNATIVE 2022 UPDATE
Management Area Description 3-11
Appendix F - 91
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