Greater Kaweah GSA Board Meeting www.GreaterKaweahGSA.org Monday, - - PDF document

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Greater Kaweah GSA Board Meeting www.GreaterKaweahGSA.org Monday, - - PDF document

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6/10/2019 Greater Kaweah GSA Board Meeting www.GreaterKaweahGSA.org Monday, June 10, 2019 APPROVAL OF MINUTES 1 6/10/2019 SUBBASIN & GSP ACTIVITIES Kaweah Subbasin Activities Subbasin Basin Setting Components Report Nearing

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6/10/2019 1

Greater Kaweah GSA Board Meeting

Monday, June 10, 2019

www.GreaterKaweahGSA.org

APPROVAL OF MINUTES

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6/10/2019 2

SUBBASIN & GSP ACTIVITIES

Kaweah Subbasin Activities

  • Subbasin Basin Setting Components Report

– Nearing completion of incorporating clean up comments

  • Numerical Model

– GSI completed Base Run Scenarios – GSI currently running scenarios with Projects and Management Actions

  • Draft Coordination Agreement discussions are ongoing.
  • Completion of SkyTEM study
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Kaweah Subbasin Activities (cont.)

  • DMS funds from GSP grant to be reallocated to Basin contract
  • Upcoming Management Team Committee meeting agenda to

include:

– DMS update and walk-through – Groundwater Quality suggested approach presentation by Richard Meyerhoff (GEI) – Prop 68 funding discussion – Public Review Drafts of GSPs – change management and response to comments approach. – Preliminary modeling results

1) Develop a 3D hydrogeological framework to assist in water resources management. 2) Produce maps of aquifer materials along the flight lines 3) Locate potential Managed Aquifer Recharge (MAR) areas along the flight lines 4) Provide information to identify optimal drilling locations for production, monitoring, and test wells

SkyTEM Investigation Objectives

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Generator Generator

Usually 2-3 Flights/day Totaling about 180-250 line-miles/day

  • Approx. 100’ – 150’ above ground

Along-Line Data Density Approximately Every ~ 10 ft

SkyTEM Helicopter AEM Operation

Abraham et al., 2016

SkyTEM In Field QA/QC

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SkyTEM: Kaweah As Flown Flight Lines

Blue dots- 440 Borehole with lithology only Yellow dots-52 Borehole with lithology and geophysical log

SkyTEM: Boreholes Near Flight Lines

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Flight Line

SkyTEM: Interpretation of the Profiles

Flight Line

Water Table

SkyTEM: Interpretation of the Profiles

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N Visalia Tulare

SkyTEM: Example Fence Diagram SkyTEM: Depth to Top of Basement

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SkyTEM: Depth to Top of Corcoran Clay SkyTEM: Thickness of Corcoran Clay

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Resistivity Greater than 25 ohm-m is optimal Good Poor

SkyTEM: Recharge Potential Based

  • n Results
  • 1. Additional AEM mapping with high density block flights would allow for improved

hydrogeologic framework for identifying recharge areas, managed aquifer recharge sites and estimating groundwater in storage and hydrogeologic boundary identification.

  • 2. Siting new boreholes used for water quality and water quantity should use the results

from this survey and future surveys to optimize locations.

  • 3. Aquifer characteristic studies such as aquifer tests and other methods should be planned

using the data from this study to optimize location for studies and observation- production well installation.

  • 4. Improved geophysical bore hole logs will benefit current and future studies. This logging

should use calibrated equipment for best results.

ITEM 3: SkyTEM Recommendations

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  • 1. Summary of Base Run Scenarios
  • 1. Average Hydrologic Conditions
  • 2. Historical Conditions
  • 3. Historical Conditions, backwards Order
  • 1. Base Run Scenario 1 - 3

Future No Project Scenarios

1) Future “No Project” Scenarios

– Current water budget conditions modified by climate data and forecasts of supply and demand. – Forecasts future groundwater levels for comparison against minimum thresholds

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  • 1. Base Run Scenario 1 - 3

Future No Project Scenarios

Future “No Project” Scenarios

  • 1. Base Run Scenario 1

Average Conditions

1) Average Hydrology

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  • 1. Base Run Scenario 2

Historical Conditions

2) Historical Hydrology

  • 1. Base Run Scenario 3

Historical Conditions - Backwards

3) Historical Hydrology in reverse order

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  • 2. Results of Base Scenarios
  • 3. Projects and Management Actions

Future Management Actions Only: Pumping Reductions Future Management Actions Only: Pumping Reductions + Projects

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  • 3. Projects and Management Actions

Greater Kaweah:

Kings County Water District

  • 3. Projects and Management Actions

Greater Kaweah:

Possible Projects and/or Management Actions Alternatives Targets as a Percentage of Average Annual Sustainable Yield Deficit (overdraft)

Alt. 2020-25 2026-30 2031-35 2036-40 Total 1 0% 20% 35% 45% 100% 2 5% 25% 30% 40% 100% 3 5% 20% 35% 40% 100% 4 10% 20% 30% 40% 100% 5 10% 30% 30% 30% 100% 6 25% 25% 25% 25% 100%

Alternatives Apportionment of Average Annual Net Increase in Supply Minus Reduction in Demand in Acre-Feet

Alt. 2020-25 2026-30 2031-35 2036-40 Total 1 8,535 14,936 19,204 42,675 2 2,134 10,669 12,803 17,070 42,675 3 2,134 8,535 14,936 17,070 42,675 4 4,268 8,535 12,803 17,070 42,675 5 4,268 12,803 12,803 12,803 42,675 6 10,669 10,669 10,669 10,669 42,675 Minimum Optimal

  • GKGSA’s Target (1997-2017 Water Budget Apportioned to WAF) = 42,675 acre-feet/year
  • Annual Native Yield of the Basin and GKGSA = 363,784 acre-feet or 0.82 acre-feet/acre/year
  • Preliminary model results using projects and management actions received

suggest above target outcomes for the first 10-15 years

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Sustainable Management Goal

  • Must be coordinated / agreed to by all three GSAs
  • Draft language has been circulated through various

committees and GSA boards for several months with only minor revisions

  • Latest language changes address comments regarding water

quality

Combined RCC/SC Recommendation: SMCs Approach for Groundwater Storage and Groundwater Levels

  • The change in groundwater storage is correlated to the chronic

decline in groundwater levels. Therefore, the SMCs for groundwater levels will be used as a proxy for the change in storage.

  • For each Representative Monitoring Site, the Minimum Threshold

for Groundwater Levels would be established at the projected 2040 GWL and the Measurable Objective would be the projected 2030 GWL.

– Provides 10 years of drought storage in the “worst-case scenario”. – This approach is subject to modification in order to avoid harm to EKGSA

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SMCs for Water Quality

  • The Basin Setting has identified existing water quality issues.

However, undesirable results related directly to groundwater levels have not been observed to-date.

  • To re-evaluate a Minimum Threshold and Measurable

Objective for each of the Constituents of Concern discussed in the Basin Setting, ongoing and future water quality monitoring will coincide with GWL measurements.

– e.g. The Kaweah Watershed Coalition has begun to collect water quality samples coincidental with GWL measurements.

SMCs for Water Quality

  • In addition to the IRLP, there are other existing programs (i.e.

Title 22 Drinking Water Program) which monitor water quality and will be used to determine the occurrence of an Undesirable Result, due to the migration of existing groundwater contamination.

  • GEI is preparing a proposed coordinated approach to SMCs for

Water Quality

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SMCs for Subsidence

  • The Basin Setting identifies Land Subsidence as a current condition in the
  • subbasin. However, damage to critical infrastructure within the Kaweah

Subbasin has not been observed to-date.

  • To establish an Minimum Threshold and Measurable Objective for

subsidence, one method would use the change in storage (with respect to the SMCs for GWLs) to develop correlations between change in storage and rates of subsidence.

  • Another method would be to calculate the potential land subsidence,

based on the change in storage, and set a land elevation for Minimum Thresholds and Measurable Objectives at the Representative Monitoring Sites.

  • TAC directed GEI to prepare a correlation analysis between storage and

subsidence rate to establish a rate of change.

GSP Development

  • Basin Setting Chapter

– GKGSA Basin Setting Chapter to be completed with Basin Setting Components Report. The TAC has provided comments on the report, which are being reviewed and addressed.

  • Monitoring Network Chapter

– Chapter has been revised to reflect comments and is under internal review. Discussions with other GSAs on coordinated Monitoring Network improvements to finalize Representative Monitoring Sites selection.

  • Sustainability Goal and Undesirable Results Chapter

– In draft, to be completed with incorporation of GSAs’ feedback and approval of Undesirable Results definitions and adoption of Sustainability Goal for the Subbasin.

  • Sustainable Management Criteria Chapter

– Draft chapter to be revised with Minimum Thresholds and Measurable Objectives, based on TAC, RCC, and SC recommendations.

  • Projects and Management Actions Chapter

– Draft chapter under internal review, includes projects and management actions discussed so far, at committees. Follow up discussions with JPA members for input and inclusion of their projects.

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GSP Development Milestones

GSP Section/Sub Section Completion Date Revised Completion Date Percent Complete

1. Introduction Draft in for Review 95% 2. Basin Setting Friday, March 29, 2019 Friday, June 14, 2019 80% 3. Sustainability Goal & Undesirable Results Friday, April 19, 2019 Friday, June 21, 2019 75% 4. Monitoring Networks Friday, April 12, 2019 Tuesday, June 18, 2019 80% 5. Minimum Thresholds, Measurable Objectives, & Interim Milestones Friday, April 26, 2019 80% 6. Water Supply Accounting Friday, April 19, 2019 65% 7. Projects, Management Actions and Adaptive Management Friday, April 26, 2019 Tuesday, June 21, 2019 60% 8. GSP Reporting Friday, April 26, 2019 75%

SMC Thresholds and Objectives – Iterative Process Developed by Stakeholders Informed by technical information including groundwater modeling Basin Setting/Water Budget Refinements Projects and Management Actions GSA Specific Model Simulations

SUBBASIN ACTIVITIES

Groundwater Model Refinement SMC Goal and SI Assessment Complete Basin Setting Chapter Groundwater Model Simulations

GSA Deliverable

Define Management Areas Develop Thresholds and Objectives for MAs Water Level Projections Draft Monitoring Network Chapter Complete Monitoring Network Chapter Complete SMC Chapter

Jan Feb Mar Apr May Jun

Water Supply Accounting Framework Draft Water Supply Accounting Chapter

Draft GSP Development Schedule

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GSP Public Review Draft

  • Goal is to have Board approval of Public Review Draft GSP at a special

meeting in late July (Mid-Kaweah mid-July, East Kaweah late-July)

  • Required 90-day comment period and public hearing notice (late October)
  • Schedule allows 2 months to address comments (comments will be

addressed as they come in) followed by one month to adopt and submit the GSP to DWR

  • DWR is required to establish its own GSP public comment period of no less

than 60 days for an adopted plan

  • A GSP that is determined to be incomplete after the deadline may be

revised and resubmitted to DWR within 180 days from the date DWR issues the assessment

GKGSA Meetings

  • May 15th Kaweah Subbasin Management Team Committee Mtg

– Coordination Agreement status, approval of project management task order amendment, discussion of modeling scenario runs, SkyTEM presentation – Next meeting June 19th@ 9:00am

  • May 16th Combined RCC / SC meeting

– Continued work to define SMCs, SkyTEM presentation, update/discussion regarding communications & engagement – Next meeting TBD (special meetings TBD)

  • June 4th TAC meeting

– Continued work to define SMCs – Next meeting July 2nd @ 1:30pm (special meetings TBD)

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NEXT MEETING DATE CLOSED SESSION