An aquifer is a geologic formation that stores, transmits, and yields significant quantities of water to wells or springs.
Aquifers come in two types. Some are formed in the space between porous materials such as sand, gravel, silt or clay and are known as alluvial aquifers or unconfined aquifers. However, in many places in California, there are aquifers beneath a rock layer that does not allow water to permeate in measurable amounts. These are known as confined aquifers.
Confined aquifers under pressure are known as artesian aquifers. This pressure can push water to the surface, which when drilled are called artesian wells.
In 1983, a landmark California Supreme Court ruling extended the public trust doctrine to tributary creeks that feed Mono Lake, which is a navigable water body even though the creeks themselves were not. The ruling marked a dramatic shift in water law and forced Los Angeles to cut back its take of water from those creeks in the Eastern Sierra to preserve the lake.
Now, a state appellate court has for the first time extended that same public trust doctrine to groundwater that feeds a navigable river, in this case the Scott River flowing through a picturesque valley of farms and alfalfa in Siskiyou County in the northern reaches of California.
As California embarks on its unprecedented mission to harness groundwater pumping, the Arizona desert may provide one guide that local managers can look to as they seek to arrest years of overdraft.
Groundwater is stressed by a demand that often outpaces natural and artificial recharge. In California, awareness of groundwater’s importance resulted in the landmark Sustainable Groundwater Management Act in 2014 that aims to have the most severely depleted basins in a state of balance in about 20 years.
Spurred by drought and a major policy shift, groundwater management has assumed an unprecedented mantle of importance in California. Local agencies in the hardest-hit areas of groundwater depletion are drawing plans to halt overdraft and bring stressed aquifers to the road of recovery.
When the Water Replenishment District of Southern California located a 30-year supply trapped between the ocean and an aquifer, it was like a prospector finding gold. … A pilot project that began in 2002 proved new technology could turn brackish water into drinking water.
Springs are where groundwater becomes surface water, acting as openings where subsurface water can discharge onto the ground or directly into other water bodies. They can also be considered the consequence of an overflowing aquifer. As a result, springs often serve as headwaters to streams.
This winter, dozens of water agencies across the state are counting on a drenching El Niño to produce surplus water to stash in the earth and make up for what’s been pumped out at unprecedented rates due to the recent absence of surface supplies.
This printed issue of Western Water looks at California groundwater and whether its sustainability can be assured by local, regional and state management. For more background information on groundwater please refer to the Foundation’s Layperson’s Guide to Groundwater.
This printed issue of Western Water looks at hydraulic fracturing, or “fracking,” in California. Much of the information in the article was presented at a conference hosted by the Groundwater Resources Association of California.
This 25-minute documentary-style DVD, developed in partnership with the California Department of Water Resources, provides an excellent overview of climate change and how it is already affecting California. The DVD also explains what scientists anticipate in the future related to sea level rise and precipitation/runoff changes and explores the efforts that are underway to plan and adapt to climate.
This 11-minute video simplifies the often-misunderstood concept of conjunctive use – coordinating surface water and groundwater supplies, which are often managed as separate resources. It explains in an easy-to-understand manner the relationship between groundwater and surface water, outlines different forms of conjunctive use, and identifies issues of concern that must be resolved for each project. Includes extensive computer graphics that illustrate these concepts.
This 15-minute video explains in an easy-to-understand manner the importance of groundwater, defines technical terms, describes sources of groundwater contamination and outlines steps communities can take to protect underground aquifers. Includes extensive computer graphics that illustrate these groundwater concepts. The short running times makes it ideal for presentations and community group meetings. Available on VHS and DVD.
Water as a renewable resource is depicted in this 18×24 inch poster. Water is renewed again and again by the natural hydrologic cycle where water evaporates, transpires from plants, rises to form clouds, and returns to the earth as precipitation. Excellent for elementary school classroom use.
Fashioned after the popular California Water Map, this 24×36 inch poster was extensively re-designed in 2017 to better illustrate the value and use of groundwater in California, the main types of aquifers, and the connection between groundwater and surface water.
The 28-page Layperson’s Guide to Groundwater is an in-depth, easy-to-understand publication that provides background and perspective on groundwater. The guide explains what groundwater is – not an underground network of rivers and lakes! – and the history of its use in California.
The 28-page Layperson’s Guide to Water Rights Law, recognized as the most thorough explanation of California water rights law available to non-lawyers, traces the authority for water flowing in a stream or reservoir, from a faucet or into an irrigation ditch through the complex web of California water rights.