Update on the Status of Hydrogeological Work in the Tule Subbasin - - PowerPoint PPT Presentation

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Feb 12, 2023 159 likes •407 views

Update on the Status of Hydrogeological Work in the Tule Subbasin in Support of SGMA Compliance May 3, 2018 Prepared for: Eastern Tule Groundwater Sustainability Agency Presentation Overview Short History of Our Involvement in the Tule

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Update on the Status of Hydrogeological Work in the Tule Subbasin in Support of SGMA Compliance

May 3, 2018 Prepared for: Eastern Tule Groundwater Sustainability Agency

SLIDE 2

Presentation Overview

 Short History of Our Involvement in the Tule

Subbasin

 Work Conducted to Date

 Hydrogeological Conceptual Model  Preliminary Detailed Water Budget  Preliminary Estimate of Sustainable Yield

 Work in Progress – Groundwater Flow Model  Next Steps

SLIDE 3

Ultimate Objective – Basin Sustainability

Sustainable Yield: The maximum quantity of water, calculated

ver a base period representative of long-term

conditions in the basin and including any temporary surplus, that can be withdrawn annually from a groundwater supply without causing an undesirable result.

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Best Management Practices

Source: California Department of Water Resources Best Management Practice Framework, Dated December 2016

SLIDE 5

Study Area

SLIDE 6

Data for the Analysis are Stored in a Database that Includes:

SLIDE 7

Sources for the Data Have Included:

 Deer Creek Tule River Authority  Tule River Association  California Statewide Groundwater Elevation

Monitoring Database (CASGEM)

 California Department of Water Resources (DWR)  Cities and Agencies within the Tule Subbasin  Kern County Water Agency  Tulare Lake Bed Coordinated Groundwater

Management Plan

 United States Geological Survey (USGS)

SLIDE 8

Wells in the Database

More than 1,000 Wells in the Groundwater Level Database More than 9,000 Driller’s Logs Records

SLIDE 9

Cross Sections (A-E)

A A’ B B’ C C’ E E’

SLIDE 10

Cross Section Along C-C′

SLIDE 11

Shallow Aquifer Deep Aquifer Confining Layer

1,200 ft bgs

Santa Margarita Fm

1,200 – 2,300 ft bgs

SLIDE 12

1998 Groundwater Contours – Shallow Aquifer

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Historical Groundwater Level Trends – Shallow Aquifer

SLIDE 14

Surface Geology

Cross Section

SLIDE 15

Iss + Imb + Ipr + Istr + Irf + Iar - Oss + Oet+ Op = ∆S

Modified from USGS PP 1766

Imb Ipr Istr Irf Op Oet Oss

Inflow Outflow Change in Storage

SLIDE 16

Tule Subbasin Surface Water Budget Inflow

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Tule Subbasin Surface Water Budget Outflow

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Tule Subbasin Groundwater Budget Inflows

SLIDE 19

Tule Subbasin Groundwater Budget Inflows/Outflows

Approx. Average Annual Overdraft: -118,000 acre-ft/yr
Approx. Cumulative Change in Storage: -2,350,000 acre-ft

SLIDE 20

Tule Subbasin Preliminary Sustainable Yield Estimate

Annual Average Sustainable Yield: 257,725 acre-ft/yr 0.54 acre-ft/acre

SLIDE 21

Work in Progress

 A Groundwater Flow Model of the Subbasin is

Being Developed (BMP-5)

 Refine the Preliminary Water Budget  Refine the Estimate of Sustainable Yield  Develop Water Budgets Specific to Each GSA  Identify Key Well Locations  Assess the Impact of Neighboring Basins on the

Tule Subbasin Sustainable Yield

 Preparing a Basin-Wide Monitoring Plan

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What is the Schedule for Making Model Results Available to the GSAs?

Model Calibration Mar – Apr 2018 Present Preliminary Model Results:

Subbasin Sustainable Yield
GSA Groundwater Budgets
Identification of Key Wells

August 2018 Authorize Preparation of the Subbasin Monitoring Plan March 2018 Prepare Surface Water, Groundwater and Land Subsidence Monitoring Plan April – August 2018 Present Draft Monitoring Plan with Recommended Prioritization for Monitoring Features/Locations August 2018 Analyze Future Basin Projections May – Aug 2018 Refine Monitoring Locations

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