Author: Cristel Tufenkjian

August 15, 2019 Board Meeting

The South Fork Kings GSA has scheduled a Board meeting on Thursday, August 15, 2019. The Board Meeting will begin at 5:30 pm. The meeting will take place at the Lemoore City Council Chambers, 429 C Street, Lemoore, CA 93245.

Board Approves $9.80 Assessment

The Board approved an assessment of $9.80 per acre for fiscal year 2020 at their June 20 meeting. Based on assessable acreage of 71,332.5, this generates a projected revenue of $699,059. This amount covers the 2020 budget of $666,246, which is the amount approved by South Fork Kings GSA landowners in the assessment election passed in 2018. Items included in the 2020 budget are administrative costs of $73,130, professional services in the amount of $377,650, and a $43,586 contingency fund. The $9.80 assessment also provides approximately $33,000 in additional revenue.

For Board consideration, Assistant Treasurer Brian Trevarrow presented Board members with two assessment options, $9.34 and $9.80. Trevarrow stated the proposed budget amount of $666,246 does not include money for legal expenses nor allow much cushion for cost increases. Another concern is the potential unplanned costs that may arise from implementing a new regulation as comprehensive and complex as SGMA (Sustainable Groundwater Management Act). Trevarrow also noted to date only $627,000 of the $698,000 revenue assessed last year is collected potentially leaving a $71,000 gap in uncollected revenue for fiscal year 2019.

Considering all of these factors, the Board decided it was prudent to approve the $9.80 rate for fiscal year 2020 to ensure the basic costs of implementing SGMA are funded and to lessen the impact of any possible shortfall in revenue due to unpaid assessments.

Twelve Wells will Monitor Groundwater

South Fork Kings GSA’s technical consultant, Geosyntec presented at the May 23 Board workshop the proposed well network to be included in the Groundwater Sustainability Plan. Three locations within the SFKGSA service area have been identified. The wells at these locations are where the GSA will measure water levels to report to the State Department of Water Resources.

The wells will provide data from three separate levels in the aquifer from shallow to deep: zones A, B, and C. A-zone wells are located in the shallow perched area of the aquifer within the top 100 feet above the A Clay. The B-zone wells are below the A Clay layer and above the Corcoran Clay, the deepest clay layer. It is an unsaturated aquifer so water levels go up and down. The C-zone are wells installed below the Corcoran Clay. It is a confined aquifer so there is less variation of what is occurring in the aquifer at that level.

The network will use existing wells but will also require the drilling of additional wells to ensure adequate data is collected. Currently, there are seven existing wells in the three locations that are part of the Kings River Conservation District’s monitoring network. There is one well in the A-zone and six wells in the B-zone. Five additional wells will need to be installed to complete the network, two in the A-zone and three wells in the C-zone.

Preliminary Monitoring Network Identified

SFKGSA’s technical consultant, Geosyntec, has researched and identified wells for consideration as part of the Groundwater Sustainability Plan monitoring network. The wells will provide data from three separate levels in the aquifer, zones A, B, and C. A zone wells are located in a perched area of the aquifer within the top 100 feet above the A Clay. The B zone wells are below the A Clay layer and above the Corcoran Clay. It is an unsaturated aquifer so water levels go up and down. The C zone are wells installed below the Corcoran Clay. It is a confined aquifer so there is less variation of what is occurring in the aquifer at that level.

Additional wells will be considered for the monitoring network, and new wells may need to be installed to ensure there are no data gaps in the network. In addition, data sharing is anticipated with neighboring GSA wells along the outer boundaries of the South Fork Kings GSA area.

Monitoring Network Preliminary Wells Map

The Model, the Data and Groundwater Sustainability

At the February 1 Board meeting, South Fork Kings Groundwater Sustainability Agency (GSA) technical consultant, Bob Anderson of Geosyntec Consultants, covered what a model can and cannot do and the importance of data and how they will be used in determining groundwater sustainability in the Tulare Lake Subbasin.

To guide regional activities necessary to implementing the Sustainable Groundwater Management Act of 2014 (SGMA), a Groundwater Sustainability Plan (GSP) will be prepared to cover the entire Tulare Lake Subbasin (see diagram below). The South Fork Kings GSA is one of six GSAs within the subbasin that must coordinate their planning to complete a shared GSP, but coordination is not limited to the six GSAs.

The Tulare Lake Subbasin is delineated by a political rather than scientific boundary. The geological or physical boundary of the principal aquifer, the San Joaquin Valley Basin, is bound on the east by the Sierra Nevada, to the west by the Coastal Range and north and south by Sacramento and the Tehachapi Mountains. The Tulare Lake Subbasin is 1 of 16 subbasins within very large (9-million acre/14,000 sq/mi) San Joaquin Valley Basin.

In order to understand and address water flow between political boundaries SGMA also requires that GSAs in each subbasin coordinate with GSAs in neighboring subbasins. The visual below shows the South Fork Kings GSA, the five other GSAs in the Tulare Lake Subbasin and their neighboring subbasins.

The core element for the GSP is its water budget, which describes the amount of water coming into a subbasin versus the amount going out. A good comparison for understanding how a water budget works is to think of it as a bank account. SGMA requires that a subbasin identify impacts of over-pumping and then take corrective actions that will result in long-term sustainability. It is up to the South Fork Kings GSA Board to define what “sustainable” means within its jurisdiction and in the entire Tulare Lake Subbasin through coordination with neighboring GSAs.

Water Budget Diagram

A computer model is a tool that breaks down an area into thousands of individual water balance cubes that when combined can make very complex groundwater flow and water balance calculations.

The computer model for the Tulare Lake Subbasin will assess the six undesirable results as defined by SGMA. Defining these six undesirable results for the South Fork Kings will be the roadmap to sustainability for the groundwater subbasin. The diagram below illustrates how a model computes one undesirable result, the chronic lowering of groundwater levels.

Models need data. Data is the best indication of what is going on. Where data does not exist, assumptions must be made and therefore the more data there is the better the analysis will be. Some data is already available through sources like the Department of Water Resources (DWR) that has collected depth to groundwater data for years.

Other important data needed include surface water diversions and cropping patterns. In the absence of measured groundwater well pumping rates, the Tulare Lake Subbasin model will back its way into a groundwater pumping estimate using cropping pattern data coupled with irrigation estimates and measured surface water diversions.

Tulare Lake Subbasin Pumping = Crop Consumptive UseSurface Water Delivery

The model and data are a couple of the pieces needed to complete the GSP by the State’s deadline of January 2020. 

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