Water & Operations
DEID has various sources of water supplies available to it depending on the year type. The primary sources of water are:
The District contracts with the U.S. Bureau of Reclamation for its primary surface water supply which comes from the Friant Division of the federal Central Valley Project.
The Friant Division of the CVP employs a unique “Class 1/Class 2” water contracting system. Class 1 water is commonly referred to as the “firm yield” of the project, but there years where the project does not provide the full amount of Class 1 water . The first 800,000 acre-feet that is made available from the project is Class 1 water.
Class 2 water is the next 1.4 million acre-feet that develops from the project. Class 2 water is available only after all of the Class 1 water has been made available. In an “average” water year, about 650,000 acre-feet of Class 2 water develops from the project.
DEID has contracted for 108,800 acre-feet of Class 1 water, making it the largest Class 1 contractor in the Friant system. It also contracts for 74,500 acre-feet of Class 2 water.
DEID has a long history of supplementing its contracted surface water with water banked during above-average water years and recovered in a later year. Water is stored in groundwater banks, typically recovered in a below-average water year and used to augment available surface water supplies.
The District utilizes both an in-district water banking program and out-of-district water banks as a supplemental water supply.
Transfers and Exchanges
This District has historically employed water management strategies that involved strategic transfers and exchanges of surface water supplies to create new water supplies for either current or future water year needs.
The District’s water distribution system was originally constructed in three phases between 1951 and 1955. It is a fully pressurized pipeline system consisting of 172 miles of rubber-gasket, reinforced concrete pipe with diameters ranging from 84″ to 12″ in size. This system allows the District to make water deliveries with little water loss, creating an extremely efficient water delivery project that is the foundation for the District’s overall water conservation and management program. The premise of this highly efficient District distribution system has been extended to many of the District’s growers through on-farm use of drip, micro-jet, and micro-sprinkler irrigation system technology.
The District has over 600 water user delivery points (turnouts). All turnouts are metered and have been since the system was originally constructed.
O & M
Water operations, grower water orders, and daily changes are coordinated through DEID’s office by a dedicated staff of office and field employees. Staff are available to react to any in-field need or emergency 24 hours a day.
Most routine maintenance is completed by District employees including pipeline repairs, pump and motor maintenance, and meter maintenance. the District does utilize outside contractors for preventative and predictive maintenance on motor control centers and pumps, meter repairs, and SCADA system management.
Historically the District has made significant investments in distribution system capital improvements. Those improvements have included reconstruction of all grower distribution points (turnouts), conversion to digital water meters, installation new electronic motor control centers and meter mains, motor control center housing, an a SCADA system to monitor and control all pumping plants in the District.
Click here to visit the Bulletin Board for district notices of scheduled maintenance projects.
Legacy Groundwater Maps
|DTW Spring||DTW Fall|
|Spring 2010||Fall 2010|
|Spring 2011||Fall 2011|
|Spring 2012||Fall 2012|
|Spring 2013||Fall 2013|
|Spring 2014||Fall 2014|
|Spring 2015||Fall 2015|
|Spring 2016||Fall 2016|
|Spring 2017||Fall 2017|
|Spring 2018||Fall 2018|