Colorado River

Strategic stream gauging network design for sustainable water management

Nature Portfolio (Springer Nature) | June 3rd, 2024

Stream gauging stations that monitor the flow of water in rivers and streams provide critical information to water managers, but biases and gaps in gauge placement, compo

Stream gauging stations that monitor the flow of water in rivers and streams provide critical information to water managers, but biases and gaps in gauge placement, compounded by gauge deactivations, limit our ability to track river flows and address global water challenges. Here we introduce an approach for identifying gauging sites to efficiently fill gaps in monitoring coverage within river networks while also addressing water management priorities, including reservoir operations, biodiversity conservation and hydroclimatic monitoring. Applying this approach to gauges in California, United States, we found substantial gaps in the stream monitoring network. Hypothetically reconfiguring gauges to locations that maximize coverage and representation of management objectives highlights the current network’s biases. Through the strategic reactivation and placement of additional gauges, we demonstrate how stream gauging networks can be designed to support sustainable water management.

Studies of Geology and Hydrology in the Basin and Range Province, Southwestern United States, For Isolation of High-Level Radioactive Waste Characterization of the Sonoran Region, California

U.S. Geological Survey (USGS) | July 15th, 1989

A study by the U.S. Geological Survey to evaluate potential hydrogeologic environments for isolation of high-level radioactive waste in the Basin and Range physiographic

A study by the U.S. Geological Survey to evaluate potential hydrogeologic environments for isolation of high-level radioactive waste in the Basin and Range physiographic province of the southwestern United States was begun in May 1981, with the introduction of the study to the Governors of eight Basin and Range States Arizona, California, Idaho, Nevada, New Mexico, Oregon, Texas, and Utah and to respective Indian tribes in those States. Accordingly, these States were invited to participate in the study by designating an earth scientist to serve on a Province Working Group with the U.S. Geological Survey membership of the working group is shown following the title page. State representatives have provided consultation in selecting guidelines, assembling geologic and hydrologic data, and assessing such information to identify environments that meet the guidelines for further study.

Subsidence (2004-2009) in and near lakebeds of the Mojave River and Morongo groundwater basins, southwest Mojave Desert, California

U.S. Geological Survey (USGS) | July 1st, 2014

Subsurface Geometry of the San Andreas Fault in Southern California: Results from the Salton Seismic Imaging Project (SSIP) and Strong Ground Motion Expectations

Seismological Society of America (SSA) | August 1st, 2017

The San Andreas fault (SAF) is one of the most studied strike‐slip faults in the world; yet its subsurface geometry is still uncertain in most locations. The Salton S

The San Andreas fault (SAF) is one of the most studied strike‐slip faults in the world; yet its subsurface geometry is still uncertain in most locations. The Salton Seismic Imaging Project (SSIP) was undertaken to image the structure surrounding the SAF and also its subsurface geometry. We present SSIP studies at two locations in the Coachella Valley of the northern Salton trough. On our line 4, a fault‐crossing profile just north of the Salton Sea, sedimentary basin depth reaches 4 km southwest of the SAF. On our line 6, a fault‐crossing profile at the north end of the Coachella Valley, sedimentary basin depth is ∼2–3km∼2–3  km and centered on the central, most active trace of the SAF. Subsurface geometry of the SAF and nearby faults along these two lines is determined using a new method of seismic‐reflection imaging, combined with potential‐field studies and earthquakes. Below a 6–9 km depth range, the SAF dips ∼50°–60°∼50°–60° NE, and above this depth range it dips more steeply. Nearby faults are also imaged in the upper 10 km, many of which dip steeply and project to mapped surface fault traces. These secondary faults may join the SAF at depths below about 10 km to form a flower‐like structure. In Appendix D, we show that rupture on a northeast‐dipping SAF, using a single plane that approximates the two dips seen in our study, produces shaking that differs from shaking calculated for the Great California ShakeOut, for which the southern SAF was modeled as vertical in most places: shorter‐period (⁠T<1sT<1  s⁠) shaking is increased locally by up to a factor of 2 on the hanging wall and is decreased locally by up to a factor of 2 on the footwall, compared to shaking calculated for a vertical fault.

Supporting sustainable groundwater management

California Agriculture (UCANR) | March 13th, 2018

Implementation of the 2014 Sustainable Groundwater Management Act is on schedule. The first phase, completed in 2017, created a new layer of local government —

Implementation of the 2014 Sustainable Groundwater Management Act is on schedule. The first phase, completed in 2017, created a new layer of local government — groundwater sustainability agencies. Now, these new agencies must prepare groundwater sustainability plans. These plans will lay out a basic reckoning for every overdrafted basin: without additional water to replace groundwater pumping or to recharge aquifers, there will be less available to produce food, supply homes and businesses, and ensure there is enough water for the environment.

Supreme Court Declines to Review Ninth Circuit Decision Applying Federal Reserved Water Rights Doctrine to Groundwater

Congressional Research Service (CRS) | December 21st, 2017

The 2012-2016 drought in California and parts of other western states may have ended, but availability of water will continue to present issues for Cong

The 2012-2016 drought in California and parts of other western states may have ended, but availability of water will continue to present issues for Congress to consider. While state, rather than federal , law typically governs allocations of water resources within a state , there are exceptions where federal law does affect water allocation. Thefederal reserved water rights doctrine, for example, holds that when the federal government reserves federal lands for a particular purpose (such as for a tribal reservation or national monument ) , it impliedly reserves a right to water necessary to accomplish the purposes for which the reservation was created . Si nce 1908, when the Supreme Court established the doctrine in Winters v. United States, courts have applied it to surface waters; a March 2017 decision of the U.S. Court of Appeals for the Ninth Circuit (Ninth Circuit) held, apparently for the first time, that the doctrine can encompass groundwater as well. On November 27, 2017, the Supreme Court declined to review this decision, which thus, for now, sets a potentially important precedent within the Ninth Circuit for other groundwater resource issues and disputes. The case Agua Caliente Band of Cahuilla Indians v. Coachella Valley Water District originated w hen a tribe sued local water agencies in 2013 in federal district court in California, alleging that the water agencies were adversely affecting the quantity and quality of water available to them by over-drafting an aquifer. Among other claims, the tribe sought a declaration that it had a federally reserved right to the groundwater underlying the reservation , which was established in the 1870s. The United States intervened to defend its ownership, tribal trust, and sovereign interests in the water rights and the tribe’s reservation. In 2015, t he district court ruled in favor of the tribe and the United States on the threshold claim that the government impliedly reserved appurtenant water sources — including underlying groundwater — when it created the tribe’ s reservation . (Subsequent phases of the Agua Caliente Band case are still being litigated. They involve whether the tribe owns the “pore space” or “storage space” of the groundwater basin.

Sustainable Groundwater Management Act and Local Agency Formation Commissions

California Association of Local Agency Formation Commissions (CALAFCO) | December 15th, 2016

The purpose of this white paper is to summarize how the Sustainable Groundwater Management Act will impact Local Agency Formation Commissions (LAFCOs) around the State of

The purpose of this white paper is to summarize how the Sustainable Groundwater Management Act will impact Local Agency Formation Commissions (LAFCOs) around the State of California. The paper will use a variety of existing documents and sources to describe SGMA and evaluate how this important new law might affect LAFCOs. It is important to note that LAFCOs do not have a formal role in implementing SGMA; however LAFCO can become involved in a number of ways that will be discussed in this paper. 

Sustainable Landscapes in California: A Guidebook for Commercial and Industrial Site Managers

Pacific Institute | August 20th, 2020

Sustainable landscaping offers a solution in balance with the local climate and ecology, and actively contributes to community and watershed health by providing economic,

Sustainable landscaping offers a solution in balance with the local climate and ecology, and actively contributes to community and watershed health by providing economic, social, and environmental benefits. This guidebook provides simple steps to consider, select, and install sustainable landscaping. Aimed specifically at businesses and communities in California, the guidebook includes information on turf replacement, installation of bioswales and rain gardens, permeable pavement, green roofs, and rain tanks and cisterns. Self-assessments guide the user through the selection and installation process.

Sustainable Use of Water in the Lower Colorado River Basin

Pacific Institute | November 26th, 1996

The Colorado River supplies water to nearly 30 million people and irrigates more than 1.5 million hectares of farmland in the United States and Mexico. But the diversion

The Colorado River supplies water to nearly 30 million people and irrigates more than 1.5 million hectares of farmland in the United States and Mexico. But the diversion of a huge amount of river water is seriously harming the delicate web of life that used to exist in the delta. The Sustainable Use of Water in the Lower Colorado River Basin, written by Sandra Postel of the Global Water Policy Project and Peter Gleick and Jason Morrison of the Pacific Institute, aims to clarify key concepts and criteria for sustainable water use within the Colorado basin, and then, using those criteria, present patterns of water management that can support economic prosperity and the environment. We do not presume to offer a single or best solution to water problems in the lower Colorado basin. The report’s goal is to define — both quantitatively and qualitatively — the unsustainable nature of current patterns of water use, and to demonstrate how technologies, policy actions, and management strategies can be combined to achieve more sustainable water use.

Taming wildfires in the context of climate change: The case of the United States

Organisation for Economic Co-operation and Development (OECD) | January 22nd, 2024

Shifts in climate cycles (e.g., Pacific Decadal Oscillation, El Niño-Southern Oscillation), combined with ongoing changes in drought, temperature and snowmelt, together,

Shifts in climate cycles (e.g., Pacific Decadal Oscillation, El Niño-Southern Oscillation), combined with ongoing changes in drought, temperature and snowmelt, together, have contributed to the overall warmer, drier conditions that fuel extreme wildfires (Environmental Protection Agency, 2022[4]; Kitzberger et al., 2007[10]; Westerling, 2016[11]). The period with the largest increase in area burned coincides with many of the warmest years on record nationwide (Environmental Protection Agency, 2022[4]). Such changes are especially visible in the western United States, where the peak extent of area burned now occurs about one month earlier than just two decades ago. Other factors including longer dry seasons and drier soils and vegetation are increasingly creating the conditions for catastrophic wildfires (Environmental Protection Agency, 2022[4]; US Global Change Research Program, 2018[9]). Wildfires are also further spreading into areas historically unaccustomed to fire, including high elevation areas in the west of the country (Figure 1.2) (OECD, 2023[2]; Alizadeh et al., 2021[12]), which may be less prepared for wildfires and potentially harmed by its impacts.