Westside Subbasins Draft Groundwater Sustainability Plan Westlands - - PowerPoint PPT Presentation

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Westside Subbasins Draft Groundwater Sustainability Plan Westlands Water District Board of Directors Serving as the Groundwater Sustainability Agency of the Westside Subbasin October 15, 2019 DRAFT 1 Outline Groundwater Sustainability

SLIDE 1

Westside Subbasin’s Draft Groundwater Sustainability Plan

Westlands Water District Board of Directors Serving as the Groundwater Sustainability Agency

f the Westside Subbasin

October 15, 2019

DRAFT 1

SLIDE 2

Outline

 Groundwater Sustainability Agency  Basin Setting  Monitoring Network  Projects and Management Actions (PMAs)  Implementation Costs  Governance  Questions

PRELIMINARY 2

SLIDE 3

Groundwater Sustainability Agency (GSA)

Chapter 1  Sustainable Groundwater Management Act requirements  Westlands Water District and Fresno County are the GSAs  Required to submit and adopt Groundwater Sustainability Plan (GSP) by January 31, 2020 to address undesirable results

PRELIMINARY 3

SLIDE 4

Notice and Communication

Chapter 2

 Hosted 15 Public Outreach Events  Provided 43 Board Updates

PRELIMINARY 4

SLIDE 5

Plan Area

Western Area of the

San Joaquin Groundwater Basin

Adjacent Subbasins:
Delta‐Mendota,
Kings,
Tulare Lake and
Pleasant Valley
Groundwater

Conditions

Land Use
Water Supplies
Water Quaility

Chapter 2

SLIDE 6

6 6

Basin Setting (Subsidence)

Chapter 2

Land Surface Clay and silt (aquitard) Sand and gravel Pre-Development Post-Development

PRELIMINARY

Radar Subsidence Measurements July 2013 to March 2015

SLIDE 7

Basin Setting (Subsidence)

Chapter 2

Check 20 Check 19 Check 18 Check 17 Check 16 Check 15

PRELIMINARY 7

SLIDE 8

PRELIMINARY

Monitoring Network (Considerations)

 Sustainability Criteria

Groundwater Levels

 Undesirable Results  Minimum Threshold  Measurable Objective

Chapter 3

Groundwater Quality

SLIDE 9

Monitoring Network (Groundwater Levels)

Monitoring Sites

Chapter 3

Land Surface Subsidence & Compaction Monitoring Sites

DRAFT

SLIDE 10

PMA No. 1 – Surface Water Deliveries

Chapter 4

Total Delivered Water (taf) PRELIMINARY 10

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PMA No. 2 ‐ Groundwater Extraction Allocation

Chapter 4  Extraction amount based

n estimated Sustainable

Yield:

Previous estimates
Numerical model

 Distribution on per‐ gross acre  Provisional amount: 0.45 AF/acre  Provisional Aquifer‐specific allocation: 0.60 AF/acre  Carryover/banking permitted  Augmented through GW Credit Program  Designed to Promote Conjunctive Use

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 Feasibility demonstrated in 2017 pilot study  Retrofitting existing wells  Report of Waste Discharge Permit complete  CEQA Review complete

PMA No. 3 – Aquifer Storage and Recovery

Chapter 4

DRAFT

SLIDE 13

PMA No. 4 – Targeted Pumping Reduction

Chapter 4

 Incentives to reduce pumping in sensitive areas/period

Determined at start of

water contract year

Subsidence areas

 Alternative sources of water

Pumping from unaffected

areas (Upper Aquifer)

In‐lieu surface water

provided by District

 PMA No. 2 may be sufficient

PRELIMINARY 13

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PMA No. 5 – Recharge Basins

Chapter 4

 Currently in exploratory and planning phase  Located on District

wned land in western

portion of Subbasin  Recharge rate up to 18 acre‐ft/day  Contingent on demonstrating feasibility

PRELIMINARY 14

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Estimated Annual GSP Monitoring Costs

Chapter 5

No. Description Estimated Annual Cost 1

Groundwater Level Monitoring $10,000

Water Quality Monitoring $20,000

Land Subsidence Monitoring $14,000

Administrative Personnel $170,000

Annual Comprehensive DWR Reporting $50,000 Total $264,000 PRELIMINARY 15

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Estimated Annual GSP Management, Administration and Other Costs

Chapter 5

No. Description Estimated Annual Cost 1

Groundwater Metering $15,000

Operation and Maintenance $45,000

Project Management and Coordination $100,000

Administrative Personnel $70,000

Engineering & Consulting Services $20,000

Legal Expenses $50,000

Public Outreach $15,000 Total $315,000 PRELIMINARY 16

SLIDE 17

Governance

Chapter 6

 Powers of the GSA

Rules and Regulations
Specific Powers
Replenishment
Groundwater Storage
Transfers (water, credits, allocations, stored water)
Accounting
Committee formation

– Advisory Committee – Technical Advisory Committee

Variances

PRELIMINARY 17

SLIDE 18

Next Steps

 Host a workshop on October 18th at 1:30 P.M.  Host a Special Board Meeting on October 30th at 3:00 P.M. to receive public comments  Review and respond to public comments  Consider adopting the GSP on December 17, 2019

PRELIMINARY 18

SLIDE 19

Questions

Kiti Campbell 559‐241‐6226 sgma@wwd.ca.gov

PRELIMINARY 19