OCWD Management Area
facilities, seawater barriers and areas of special investigation where drawdown, water quality impacts or contaminants are of concern.
Groundwater elevation contour maps for the Shallow, Principal and Deep Aquifers are prepared annually and are scanned and digitized into OCWD ’s GIS database. Figures 3-5, 3-6, and 3-7 show the groundwater elevation contours for June 2021 for all three basin aquifers. The changes in groundwater elevations for the three aquifers are also calculated on an annual basis. The water level changes for each of the three aquifers for June 2020 to June 2021 are shown in Figures 9-1, 9-2 and 9-3.
9.3 MANAGEMENT OF GROUNDWATER LEVELS FOR SUSTAINABILITY
For each of the three major aquifer systems, GIS mapping is used to multiply the water level changes by a grid of aquifer storage properties from OCWD’s calibrated groundwater flow model. This results in a storage change volume for each of the three aquifer layers which are totaled to provide a net annual storage change for the basin. Thus, measurements of groundwater elevations are ultimately used to calculate total basin storage levels each year.
2017 BASIN 8-1 ALTERNATIVE
Sustainable Management: Groundwater Levels 9-2
Appendix F - 150
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