Greater Kaweah GSA Technical Advisory Committee Meeting - - PDF document

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Greater Kaweah GSA Technical Advisory Committee Meeting

Friday, April 26, 2019

www.GreaterKaweahGSA.org

ITEM 2: ANNOUNCEMENTS

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ITEM 3: MINUTES ITEM 4: REVIEW OF DRAFT BASIN SETTING

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ITEM 5: UPDATE ON DRAFT GSP MONITORING NETWORK CHAPTER

Monitoring Network Chapter

• The Monitoring Network Chapter consists of 3 parts:

– A description of existing monitoring programs and the data collected – Identification of data gaps with respect to the requirements of SGMA – Plans to address the data gaps identified in the 2020 GSP

• Use of Existing Monitoring Programs
• Development of a SGMA-Compliant Monitoring Network

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Monitoring Network Chapter

• SGMA requires that a coordinated, subbasin wide

monitoring network be developed and used for the evaluation of the subbasin’s performance in the Sustainability Indicators defined by SGMA.

– SGMA allows for the use of Representative Monitoring Sites and Proxy Measurements for evaluating SI performance.

Overview of Existing Monitoring

The following have been identified at the Subbasin level:

• Existing groundwater level monitoring programs
• Existing groundwater quality programs
• Existing land surface subsidence monitoring, and
• Existing surface water flow monitoring

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Existing Groundwater Level Monitoring

Agency Frequency of Monitoring Period of Record for Monitoring Types of Wells Monitored Number of Wells (Approx.) Known Completion of Wells Monitored Number of Dual Completion Wells Automated Monitoring Alta ID Monthly to bi- annually 1921 – 2011 Ag/ Domestic 5 None None Unknown Bureau of Reclamation Monthly to bi- annually 1924 – 2008 Unknown 118 15 Unknown Unknown Cal Water (City of Visalia) Monthly 1971 – 2018 Municipal 104 None Unknown Unknown Dept of Water Resources Bi-annually 1930 – 2016 Various 182 7 Unknown Unknown Exeter ID Bi-annually 1963 – 2016 Agricultural 40 None Unknown Unknown KDWCD Monthly to Bi- Annually 1919 – 2018 Agricultural 425 30 4 Unknown Kings County Water District Bi-annually 2011 – 2018 Agricultural 6 3 Unknown Unknown Lakeside ID Bi-annually 2012 – 2017 Agricultural 33 2 Unknown Unknown

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Groundwater Level Data Gaps

• There are a total of 14 Dedicated Groundwater Level

Monitoring Wells throughout the entire Subbasin.

• An additional 6 wells are proposed with the TSS funding

application at DWR, bringing the total to 20 wells.

– The desired density of wells, according the DWR’s BMP on Monitoring Networks ranges between 4 and 10 wells per 100

• sq. miles.
• Between 28 wells and 70 wells for the entire Kaweah Subbasin.

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Existing Groundwater Quality Monitoring

Water Quality Monitoring Program Participating Agencies Parameters Frequency AB 3030 and SB 1938

Exeter ID, KDWCD, Lakeside ID Ag suitability analysis (limited suite of general minerals) Annually to Once Every 3 Years

CA SDWIS

City of Exeter, City of Farmersville, Ivanhoe Public Utility District, City of Woodlake All Title 22 regulated constituents Title 22 General Minerals & Metals, every 3 years Nitrates, annually (quartertlyif ≥ 5 ppm) VOCs and SOCs, every 3 years Uranium, dependent on historical sampling. Varies between 1 sample every 3 (when ≥ 10 pCi/L), 6 (when < 10 pCi/L) or 9 (when no historical detection) years

CV-SALTS

Most constituents sampled monthly, quarterly General Minerals from source water and annual General Minerals from waste discharge. Kaweah is a Priority 1 Basin, meaning that management strategies will be initiated in 2019

Dept of Pesticide Regulation (DPR)

City of Exeter, City of Farmersville, Ivanhoe Public Utility District, City of Woodlake Pesticides Annual

GAMA

SWRCB, Central Valley RWQCB, DWR, DPR, NWIS, LLNL Constituents sampled vary by Program Objectives USGS is typically the technical lead in conducting the studies and reporting data The Priority Basin Project performed baseline and trend assessments, sampling 2,900 public and domestic wells statewide. The Domestic Well Project sampled over 180 wells in Tulare County (29 wells were in the Kaweah Subbasin).

Irrigated Lands Regulatory Program (IRLP)

Kaweah River Watershed Coalition Static Water Level, temperature, pH, electrical conductance, Nitrate as Nitrogen, dissolved Oxygen (Annually) General Minerals suite (every 5 years) Varies; Annually to every 5 years (first samples collected in fall 2018)

Water Quality Data Gaps

• In areas with two aquifer systems, do the existing monitoring

programs identify which aquifer is being monitored?

– GEI and GSI have reviewed the well completion data available and identified the aquifers being monitored for water quality with the existing monitoring programs.

• Implementation of CV-SALTS should help address areas

beyond municipal and domestic groundwater use.

– Use of information from the IRLP, which includes GWLs taken at the water quality sampling sites, will also help address coverage in rural areas.

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Existing Subsidence Monitoring

Category Monitoring Entity (Entities) Period of Record Historical Monitoring

National Geodetic Survey of benchmarks (repeat level surveys) 1926 – 1970

Recent Monitoring

National Geodetic Survey of benchmarks (repeat level surveys). Installation and measurement of Deer Creek extensometer (8.5 miles south of Kaweah Subbasin, in the Tule Subbasin) KDWCD Land Surface Elevation Monitoring (local benchmark monitoring network) CGPS data from UNAVCO and CVSRN stations: P056, P566, CRCN, LEMA, and RAPT NASA (InSAR and UAVSAR programs) NGS: 1970 to present 2016 to present CGPS: 2006 to Present (depending on station) NASA: 2006 – 2017 (except for 2011 – 2014)

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Subsidence Data Gaps

• While there is extensive coverage with the KDWCD Land

Surface Elevation Monitoring Stations, the data has only been collected since 2016.

– Continued collection of this data and use of other existing programs, with InSAR imagery, will need to be evaluated in the implementation of SGMA to determine if any additional monitoring is needed. – KDWCD has provided feedback and updates on the Land Surface Elevation Monitoring network and an up-to-date description of the procedures for GEI’s use in the Monitoring Network chapter.

Representative Monitoring Sites

• Can have multiple sites per Management Area
• Can monitor multiple SIs at a Site

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Representative Monitoring Sites

• Criteria for Selection of Representative Monitoring Sites:

– Is there already a dedicated monitoring well at the location? – If not, are there wells of known construction that can be converted to monitoring wells or used for the interim?

• In areas with two aquifer systems, in which system are these wells

completed?

– Is there adequate well density and distribution for the management area? – Is there a good record of hydrology for the well?

• Of the Key Wells in the Basin Setting, 85 meet this

criteria.

Representative Monitoring Sites

Completion

• No. of Wells

Single Aquifer 56 Lower Aquifer 2 Upper Aquifer 27 TOTAL 85

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Management Area Concepts Management Area Concepts

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ITEM 6: UPDATE ON SUSTAINABLE MANAGEMENT CRITERIA DEVELOPMENT

SMCs Approach for Groundwater Levels

• For each Representative Monitoring Site, the Minimum

Threshold for Groundwater Levels would be established at the projected 2040 GWL.

– This approach is meant to account for a “worst-case scenario” in which we experience worse drought conditions than we have historically.

• The Measurable Objective for Groundwater Levels would be

the projected 2030 GWL.

– Provides 10 years of drought storage in the “worst-case scenario”.

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SMCs for Change in Storage

• 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.

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.

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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.

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.

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ITEM 7: Measurement & Monitoring Options

Vendor Product Accuracy Pros Cons Unit Cost Rosemount 8750 Mag Meter 0.25% - 0.5%

• Proven Record
• Expandable Wireless Network

Capabilities for Remote Communication

• Cost
• Wireless network will be an

add’l cost ~ $5200/unit PowWow +/- 4%

• Inexpensive
• No Add’l Installation Cost
• Bulk Discounts up to ~60%
• Maintains Title 23 Certification

(< 10% error)

• Yearly recurring payments
• No option to add GWL

monitoring instruments to system $500/unit $200-$300/unit on bulk orders McCrometer

• FPI Mag

Meter

• Ultra Mag

Meter 0.5% - 1.0% 0.5%

• Meter installed on Pump
• Multiple Meters can track flow

to individual fields/crops

• Cost
• Add’l installation cost
• May not fit for all

applications

• Add’l cost for network

~$5500/unit McCrometer Propeller Meters 2%

• Inexpensive, compared to mag

meters

• Moving parts that can be

damaged/become worn

• Require longer pipe runs for

installation

• Add’l installation cost

~$2,800/unit

TSS Funding for Monitoring Wells

• The Kaweah Subbasin was approved for TSS funding to provide

additional, SGMA-compliant monitoring wells.

– In February, the GSAs were notified that DWR was still working with its drilling contractor to develop the schedule and negotiating on the costs to be able to complete as many wells as possible in this first round of funding. – As of earlier this week, the draft language for the Agreement was provided to the GSAs for their review. – DWR will provide the Agreement documents, completed with information provided in the TSS application in the coming weeks. – DWR is also asking each basin to prioritize the order of wells to be drilled, in case there is not sufficient funding to complete all wells in the basin.

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ITEM 8: TECH SERVICES UPDATE

Kaweah Subbasin Activities

• Subbasin Basin Setting Components Report

– Delivered to GSA Managers and discussed at Subbasin Management Team meeting on March 20th.

• Numerical Model

– Refined with water budget refinements, discussed at Management Team

• meeting. GSAs to decide which simulations to run at the subbasin-level.
• Draft Coordination Agreement discussions are ongoing.
• Water Budget components have been applied to Water Supply Accounting

Framework that has been agreed upon at the Subbasin-level. Currently under review with the GSA managers.

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Kaweah Subbasin Coordination (cont.) KSB Basin Setting Status

• KSB Managers and GSA TAC recently completed review of

December 1, 2019 Draft Basin Setting

• Approved Amended Task Order KSB-05.2018 – Basin Setting at

February Meeting

• GEI Team has incorporate KSB Managers comments

addressing these issues: 1. Decrease Kaweah River and CVP Water deliveries 2. Decrease Mountain Front Recharge in EKGSA and portions of GKGSA 3. Recalculate percolation or precipitation and applied water during period 1981-1999 using different methodology 4. Improve boundary flux estimates using numerical groundwater model 5. Document the specific yield method for calculating change in groundwater basin storage

Kaweah Subbasin Coordination (cont.) Revised Water Budgets

Each of these three water budgets periods have been refined with the recent Basin Setting Update

• Historic Period – 1981 to 2017
• Current Period – 1997 to 2017
• Projected Future – 2017 to 2070

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Kaweah Subbasin Coordination (cont.) QC Checks on Water Budget Accounting

Specific Yield Analysis Groundwater Modeling

Method Historic Period Modeling Period Water Budget (Inventory)

• 2,428,500
• 2,715,500

Specific Yield

• 3,127,300
• 2,948,600

Numerical Model

• 2,656,000

Kaweah Subbasin Coordination (cont.) Ave Overdraft – Historical vs. Current

Historical Average Overdraft: 65,600 AF/Y Current Average Overdraft: 77,591 AF/Y

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Kaweah Subbasin Coordination (cont.) Projected Water Budget

Water Supply Accounting Framework

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Native Water (Segregated by GSA Acreage)

East Greater Mid Total Perc of Precip (Ag and 'Native' non-Ag land) 23,666 44,213 20,974 88,854 Streambed Perc from Kaweah River Sources 16,767 31,324 14,860 62,952 Irrigation Ret. Flow from Pumped GW 41,484 77,501 36,766 155,752 Mountain Front Recharge 14,976 27,978 13,273 56,227 Total Native 96,894 181,017 85,874 363,784 GSA % of Total Native 27% 50% 24% Native Water

Foreign Water (Segregated by Appropriator)

East Greater Mid Total Streambed Perc from Imported Sources 1,638 12,615 14,253 Ditch Perc from Imported Sources 1,204 21,745 22,949 Basin Perc from Imported Sources 1,050 14,305 15,355 Irrigation Ret. Flow from Imported Sources 12,073 1,241 7,140 20,453 Total Foreign 12,073 5,133 55,805 73,010 GSA % of Total Foreign 17% 7% 76% Foreign Water

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Salvaged Water

(Segregated by Appropriator)

East Greater Mid Total Ditch Perc from Kaweah River Sources 8,835 49,771 34,880 93,486 Additional Recharge 226 6,892 5,697 12,815 Stormwater Return Flows 508 2,370 8,491 11,368 WWTP Return Flows 1,470 3,129 13,878 18,477 Basin Perc from Kaweah River Sources 16,005 23,479 39,484

• Irrig. Ret. Flow from

Kaweah River Sources 4,555 31,039 11,981 47,574 Total Salvaged 15,593 109,205 98,406 223,205 GSA % of Total Salvaged 7% 49% 44% Salvaged Water

Allocation Summary

Allocation Bucket East Greater Mid Total Total Native 96,894 181,017 85,874 363,784 Total Foreign 12,073 5,133 55,805 73,010 Total Salvaged 15,593 109,205 98,406 223,205 Grand Total 124,560 295,355 240,084 659,999 GSA % of Total 19% 45% 36%

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Initial GW Model Runs

1) Water Allocation Verification

– Purpose of this run is to verify and refine the water allocation results just presented derived from the inventory method water budget

Initial GW Model Runs

2) Future No Project Scenario: Base Case

– Assumes current water budget conditions exist in the future modified only by DWR provided climate data sets and forecasts of supply and demand. Distribution of groundwater pumping is consistent with current water budget period – GW model forecasts future groundwater levels for comparison against minimum thresholds

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Initial GW Model Runs

3) Future Management Actions Only: Pumping Reductions

– Assumes current water budget conditions exist in the future modified only by DWR provided climate data sets and forecasts of supply and demand and pumping conforms to water allocations in water accounting framework – GW model forecasts future groundwater levels for setting groundwater level measurable objective and interim milestones

Initial GW Model Runs

4) Future Management Actions Only: Pumping Reductions + Projects

– Assumes current water budget conditions exist in the future modified only by DWR provided climate data sets and forecasts of supply and demand, pumping conforms to water allocations in water accounting framework, and projects area implemented on planned schedule. – GW model forecasts future groundwater levels for setting groundwater level optimal measurable objective and interim milestones

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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

GSP Development Schedule

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

GSP Development Milestones

GSP Section/Sub Section Completion Date Revised Completion Date (04/25/19) Percent Complete

1. Introduction Draft in for Review Friday, April 5, 2019 95% 2. Basin Setting Friday, March 29, 2019 Friday, April 12, 2019 80% 3. Sustainability Goal & Undesirable Results Friday, April 19, 2019 Friday, April 26, 2019 75% 4. Monitoring Networks Friday, April 12, 2019 Friday, April 26, 2019 80% 5. Minimum Thresholds, Measurable Objectives, & Interim Milestones Friday, April 26, 2019 Monday, April 29, 2019 80% 6. Water Supply Accounting Friday, April 19, 2019 Tuesday, April 30, 2019 65% 7. Projects, Management Actions and Adaptive Management Friday, April 26, 2019 Tuesday, April 30, 2019 60% 8. GSP Reporting Friday, April 26, 2019 Tuesday, April 30, 2019 75%

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GSP Development

• Basin Setting Chapter

– GKGSA Basin Setting Chapter to be completed with Basin Setting Components Report that was provided to GSA Managers on March 20th. Comments from GKGSA committee members to be incorporated into GKGSA chapter.

• Monitoring Network Chapter

– Comments received from GKGSA TAC members. Discussions with other GSAs on coordinated Monitoring Network improvements to finalize Representative Monitoring Sites selection.

• Sustainability Goal and Undesirable Results Chapter

– Draft of chapter under review. 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 narrative under review. To be completed with initial Minimum Thresholds and Measurable Objectives, then reviewed by TAC, RCC, and SC for recommendations.

• Projects and Management Actions Chapter

– Management Actions to be discussed in committees for consideration in the GSP.

ITEM 9: GKGSA MEETINGS REPORT

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ITEM 10: FUTURE AGENDA ITEMS AND MEETING DATE(s)