Design and implementation of an emergency environmental responsesystem to protect migrating salmon in the lower San Joaquin River,California

In the past decade tens of millions of dollars have beenspent by water resource agencies in California to restore the nativesalmon fishery in the San Joaquin River and its major tributaries. Anexcavated deep water ship channel (DWSC), through which the river runs onits way to the Bay/Delta and Pacific Ocean, experiences episodes of lowdissolved oxygen which acts as a barrier to anadromous fish migration anda threat to the long-term survival of the salmon run. An emergencyresponse management system is under development to forecast theseepisodes of low dissolved oxygen and to deploy measures that will raisedissolved oxygen concentrations to prevent damage to the fisheryresource. The emergency response management system has been designed tointeract with a real-time water quality monitoring network and is servedby a comprehensive data management and forecasting model toolbox. TheBay/Delta and Tributaries (BDAT) Cooperative Data Management System is adistributed, web accessible database that contains terabytes ofinformation on all aspects of the ecology of the Bay/Delta and upperwatersheds. The complexity of the problem dictates data integration froma variety of monitoring programs. A unique data templating system hasbeen constructed to serve the needs of cooperating scientists who wish toshare their data and to simplify and streamline data uploading into themaster database. In this paper we demonstrate the utility of such asystem in providing decision support for management of the San JoaquinRiver fishery. We discuss how the system might be expanded to havefurther utility in coping with other emergencies and threats to watersupply system serving California's costal communities

Transitions for the Delta Economy

Details threats to the Sacramento-San Joaquin Delta, policy proposals to improve environmental management and water supply reliability, how these changes will affect land and water conditions, and implications for the area's and regional economies

California Water Myths

Presents eight common myths about water supply, ecosystems, and the legal and political aspects of governing California's water system and explains how each myth drives the debate, the reality, and alternatives for better informed policy discussions

Thirsty for Justice: A People's Blueprint for California Water

The report's first chapter analyzes the origins of environmental discrimination in California water policy. After an overview of how low income communities and communities of color have been historically left out of California water management, we analyze political, economic and social trends that produce the current exclusionary system and emerging policies and technologies that could further harm low-income communities and communities of color.In the second chapter, we provide an overview of what we term "water governance": who controls water supply and quality and what agencies are responsible for ensuring that people have enough clean water. We explain the current system of water governance, examine changing patterns in control over water, and provide examples of communities that face profound barriers to participating in water decisions. We conclude by discussing barriers within water regulatory entities that prevent community voices from entering into water decision-making.In the third chapter, we provide a picture of water-related environmental injustices that low-income communities and communities of color face on a daily basis. These communities' lack of access to safe, affordable drinking water and healthy watersheds exemplifies the health burdens many communities bear as a result of California's water policies.Our report concludes with policy recommendations for how to remedy some of the most pressing water concerns low-income communities and communities of color face, in order to guarantee the basic right to safe and affordable water

Climate change and the Delta, San Francisco Estuary and Watershed Science

Anthropogenic climate change amounts to a rapidly approaching, “new” stressor in the Sacramento–San Joaquin Delta system. In response to California’s extreme natural hydroclimatic variability, complex water-management systems have been developed, even as the Delta’s natural ecosystems have been largely devastated. Climate change is projected to challenge these management and ecological systems in different ways that are characterized by different levels of uncertainty. For example, there is high certainty that climate will warm by about 2°C more (than late-20th-century averages) by mid-century and about 4°C by end of century, if greenhouse-gas emissions continue their current rates of acceleration. Future precipitation changes are much less certain, with as many climate models projecting wetter conditions as drier. However, the same projections agree that precipitation will be more intense when storms do arrive, even as more dry days will separate storms. Warmer temperatures will likely enhance evaporative demands and raise water temperatures. Consequently, climate change is projected to yield both more extreme flood risks and greater drought risks. Sea level rise (SLR) during the 20th century was about 22cm, and is projected to increase by at least 3-fold this century. SLR together with land subsidence threatens the Delta with greater vulnerabilities to inundation and salinity intrusion. Effects on the Delta ecosystem that are traceable to warming include SLR, reduced snowpack, earlier snowmelt and larger storm-driven streamflows, warmer and longer summers, warmer summer water temperatures, and water-quality changes. These changes and their uncertainties will challenge the operations of water projects and uses throughout the Delta’s watershed and delivery areas. Although the effects of climate change on Delta ecosystems may be profound, the end results are difficult to predict, except that native species will fare worse than invaders. Successful preparation for the coming changes will require greater integration of monitoring, modeling, and decision making across time, variables, and space than has been historically normal

Conserving California Landscapes: Midterm Report

Provides a review at the halfway point of a program that was designed to conserve large expanses of open space, farmlands, and wildlife habitat in three California regions: the Central Coast, the Central Valley, and the Sierra Nevada

Fixing the Delta: How Will We Pay for It?

Reviews proposals for preserving the Sacramento-San Joaquin Delta, such as levee repair and construction of new reservoirs; the debate over beneficiary financing; and implications of recent court decisions. Identifies feasible beneficiary payment options

An integrated study of earth resources in the State of California using remote sensing techniques

The author has identified the following significant results. The supply, demand, and impact relationships of California's water resources as exemplified by the Feather River project and other aspects of the California Water Plan are discussed

Simulating California reservoir operation using the classification and regression-tree algorithm combined with a shuffled cross-validation scheme

The controlled outflows from a reservoir or dam are highly dependent on the decisions made by the reservoir operators, instead of a natural hydrological process. Difference exists between the natural upstream inflows to reservoirs and the controlled outflows from reservoirs that supply the downstream users. With the decision maker's awareness of changing climate, reservoir management requires adaptable means to incorporate more information into decision making, such as water delivery requirement, environmental constraints, dry/wet conditions, etc. In this paper, a robust reservoir outflow simulation model is presented, which incorporates one of the well-developed data-mining models (Classification and Regression Tree) to predict the complicated human-controlled reservoir outflows and extract the reservoir operation patterns. A shuffled cross-validation approach is further implemented to improve CART's predictive performance. An application study of nine major reservoirs in California is carried out. Results produced by the enhanced CART, original CART, and random forest are compared with observation. The statistical measurements show that the enhanced CART and random forest overperform the CART control run in general, and the enhanced CART algorithm gives a better predictive performance over random forest in simulating the peak flows. The results also show that the proposed model is able to consistently and reasonably predict the expert release decisions. Experiments indicate that the release operation in the Oroville Lake is significantly dominated by SWP allocation amount and reservoirs with low elevation are more sensitive to inflow amount than others