Tehama County Groundwater Sustainability Plan Implementation 

Client: Luhdorff & Scalmanini Consulting Engineers (LSCE; TCFCWCD is LSCE’s client)

Funder: DWR (SGMA Round 2 Prop 68 grant)

Location: Corning, Red Bluff, Antelope, and Los Molinos Subbasins (Glenn and Tehama Counties, CA)

Date: 2023-2026

As a key partner in the Luhdorff and Scalmanini Consulting Engineers (LSCE) team, Davids Engineering, Inc. (DE) is currently supporting the Tehama County Flood Control and Water Conservation District (TCFCWCD) and the Corning Subbasin Groundwater Sustainability Agency (CSGSA) in their Groundwater Sustainability Plan (GSP) implementation efforts. GSP implementation efforts are supported under Sustainable Groundwater Management Act (SGMA) Implementation Round 2 grants awarded for the Red Bluff, Los Molinos, Antelope, and Corning Subbasins.

As part of these efforts from 2023-2026, DE is supporting:

• Developing and implementing a policy framework for demand management, and/or water and land use restrictions, and/or well permitting in the Corning Subbasin.

• Planning and implementing a synoptic stream gage study to evaluate interconnected surface water, including work plan development, data collection and field work, as well as data analysis, evaluation, and reporting.

• Planning and implementing various multi-benefit, direct, and in-lieu recharge projects across the Red Bluff and Corning Subbasins, including:
– Planning, design, and documentation related to feasibility studies and evaluations.
– Identifying potential recharge sites, in coordination with growers, landowners, and agencies.
– Identifying potential water supplies, recharge techniques, and recharge infrastructure, as appropriate.
– Creating design materials and documents for recharge infrastructure and site preparation.
– Supporting project permitting efforts and CEQA documentation, as appropriate.
– Developing implementation plans, monitoring and efficiency evaluation strategies, and related documentation.

• Creating and implementing a planning, design, and implementation study to facilitate regional water transfers to support enhanced use of available surface water for in-lieu recharge in the Corning Subbasin.

• Supporting SGMA reporting efforts, including GSP periodic evaluations and annual reports for the Red Bluff, Los Molinos, Antelope, Corning, and Bowman Subbasins (as applicable).

• Developing and updating a regional integrated surface water-groundwater model.

• Revising GSPs for the Red Bluff, Los Molinos, Antelope, and Corning Subbasins in response to the incomplete determinations by DWR.

Through these many efforts, DE is supporting the TCFCWCD and CSGSA in their endeavor to achieve and maintain sustainable groundwater conditions in the Red Bluff, Los Molinos, Antelope and Corning Subbasins by 2042.

All Projects

Tehama County Groundwater Sustainability Plan Implementation 

Colusa Subbasin Groundwater Sustainability Plan Revisions

Madera Subbasin Groundwater Sustainability Plan Revisions 

Chowchilla Subbasin Groundwater Sustainability Plan Revisions

Moore Siphon Replacement Project

Dos Rios Ranch SB88 Compliance and Crop Planning Analysis

Hart Ranch On-Farm Irrigation Efficiency Improvements

Orland Project Distribution System Modernization

Water Management Plan Compliance Mapping

Agricultural Development Feasibility Assessment

Analysis of Effects of Water Management on Evapotranspiration from Managed Wetlands

Garden Highway Mutual Water Company Water Control Projects

Richvale Irrigation District Phase I Infrastructure Modernization

Joint Water Districts Board SCADA

Sutter Mutual Water Company Modernization Support

Shasta Valley Groundwater Monitoring

Time Series Evapotranspiration and Applied Water Estimates from Remote Sensing

Customer Delivery Measurement Data Collection and Accounting (RemoteTracker Implementation)

SGMA Technical Support Services and Prop 1 Stressed Basin Grant Project

Efficiency Conservation Definite Plan and Conservation Program

Boundary Outflow Measurements

Oakdale Irrigation District Agricultural Water Management Plan

Yuba Water Agency Agricultural Water Managment Plan

Feather River Agricultural Water Management Plan (FRRAWMP)

Colusa Subbasin Groundwater Sustainability Plan Development

Madera and Chowchilla Subbasins Groundwater Sustainability Plans

2022 Verification Project for Madera County GSAs

Little Shasta River Efficiency Study

Mill Creek Flow Measurement Improvements

Kettle Spring Improvement Project

Antelope Creek Fish Passage Improvement Project

Conservation Planning and Operations Decision Support