Draft 2025 Urban Water Management Plan

Table of Contents

3.2.1 Groundwater Elevation Contours .............................................................. 3-7

3.2.2 Regional Pumping Patterns..................................................................... 3-10

3.2.3 Long-Term Groundwater Elevation Hydrographs.................................... 3-11

3.2.4 Groundwater Storage Data ..................................................................... 3-18

3.3 BASIN MODEL..........................................................................................................3-18

3.3.1

Groundwater Quality Conditions .......................................................... 3-19

3.3.2 Coastal Gaps .......................................................................................... 3-26

3.3.3 Land Subsidence .................................................................................... 3-27

3.3.4 Groundwater/Surface Water Interactions and Groundwater Dependent Ecosystems......................................................................................... 3-28

SECTION 4 WATER BUDGET .............................................................................................4-1

4.1 WATER BUDGET COMPONENTS .............................................................................4-1

4.1.1 Measured Recharge.................................................................................. 4-1

4.1.2 Unmeasured Recharge ............................................................................. 4-1

4.1.3 Groundwater Production ........................................................................... 4-2

4.1.4 Subsurface Outflow ................................................................................... 4-3

4.1.5 Evaporation ............................................................................................... 4-3

4.2 WATER YEAR TYPE ..................................................................................................4-3

4.3 ESTIMATE OF SUSTAINABLE YIELD........................................................................4-4

4.4 WATER BUDGETS .....................................................................................................4-4

SECTION 5 WATER RESOURCE MONITORING PROGRAMS...........................................5-1

5.1 OVERVIEW ................................................................................................................. 5-1

5.2 GROUNDWATER MONITORING PROGRAMS..........................................................5-1

5.2.1 Groundwater Production Monitoring.......................................................... 5-4

5.2.2 Groundwater Elevation Monitoring ............................................................ 5-5

5.2.3 Groundwater Quality Monitoring................................................................ 5-8

BASIN 8-1 ALTERNATIVE 2022 UPDATE

Table of Contents

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Appendix F - 61

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