The State of the Hudson 2009

The State of the Hudson 2009

Date: 2009
Creator: New York (State). Hudson River Estuary Program.
Description: This report describes the environmental quality of the Hudson River and its watershed, including issues such as pollution, population growth, and biodiversity. The report also describes the habitats of estuaries, watersheds, and rivers in general.
Contributing Partner: UNT Libraries
Development, validation, and evaluation of a continuous, real-time, bivalve biomonitoring system.

Development, validation, and evaluation of a continuous, real-time, bivalve biomonitoring system.

Access: Use of this item is restricted to the UNT Community.
Date: December 2002
Creator: Allen, H. Joel
Description: A biological monitoring tool to assess water quality using bivalve gape behavior was developed and demonstrated. The purpose of this work was to develop methodologies for screening water quality appropriate to the goals of the watershed paradigm. A model of bivalve gape behavior based on prediction of behavior using autoregressive techniques was the foundation of the bivalve biomonitoring system. Current technology was used in developing the system to provide bivalve gape state data in a continuous real-time manner. A laboratory version of the system, including data collection and analysis hardware and software, was developed for use as a toxicological assay for determination of effective concentrations of toxicant(s) or other types of stress on bivalve gape behavior. Corbicula fluminea was monitored and challenged with copper, zinc, and chlorpyrifos using the system. Effective concentrations of 176±23µg/L copper, 768±412µg/L zinc, and 68µg/L chlorpyrifos were observed using a natural water with high dissolved organic carbon concentrations. A rugged field version of the bivalve biomonitoring system was developed and deployed in two locations. The field systems were fitted with a photovoltaic array, a single board computer, and a CDPD telemetry modem for robust remote operation. Data were telemetered at a time relevant rate of once ...
Contributing Partner: UNT Libraries
Water Quality: Federal Role in Addressing and Contributing to Nonpoint Source Pollution

Water Quality: Federal Role in Addressing and Contributing to Nonpoint Source Pollution

Date: February 26, 1999
Creator: United States. General Accounting Office.
Description: A chapter report issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO provided information on the impacts of nonpoint source water pollution and the potential costs of dealing with the problem, focusing on: (1) funding levels for federal programs that primarily address nonpoint source pollution; (2) the way Environmental Protection Agency (EPA) assesses the overall potential costs of reducing nonpoint pollution nationwide and alternative methods for doing so; and (3) nonpoint source pollution from federal facilities, lands, and activities that federal agencies manage or authorize, or for which they issue permits or licenses."
Contributing Partner: UNT Libraries Government Documents Department
Water Quality: Inconsistent State Approaches Complicate Nation's Efforts to Identify Its Most Polluted Waters

Water Quality: Inconsistent State Approaches Complicate Nation's Efforts to Identify Its Most Polluted Waters

Date: January 11, 2002
Creator: United States. General Accounting Office.
Description: A letter report issued by the General Accounting Office with an abstract that begins "The Environmental Protection Agency (EPA) believes that more than 20,000 bodies of water throughout the country are too polluted to meet water quality standards. States use different approaches to identify impaired waters. This variation has led not only to inconsistencies in the listing of impaired waters but also to difficulties in identifying the total number of impaired waters nationwide and the total number of total maximum daily loads (TMDL) needed to bring such waters up to standards. Under the Clean Water Act and its regulations, EPA has given the states some flexibility to develop listing approaches that are tailored to their circumstances. However, some of the approaches have no appropriate scientific basis. States apply a range of quality assurance procedures to ensure the quality of data used to make impairment decisions. Although states have long used quality assurance procedures for the data they collect directly, they have become increasingly vigilant about applying such procedures to data from other sources. Because of inconsistencies in states' approaches to identifying impaired waters, the information in EPA's database of impaired waters is of questionable reliability. The number of impaired waters ...
Contributing Partner: UNT Libraries Government Documents Department
The Impacts and Costs of Climate Change

The Impacts and Costs of Climate Change

Date: September 2005
Creator: Watkiss, Paul; Downing, Tom; Handley, Claire & Butterfield, Ruth
Description: The effects of global climate change from greenhouse gas emissions (GHGs) are diverse and potentially very large, and probably constitute the most serious long-term environmental issue currently facing the world. This paper is prepared as task 1 of the project 'Modelling support for Future Actions - Benefits and Cost of Climate Change Policies and Measures', ENV.C.2/2004/0088, led by K.U.Leuven, Katholieke Universiteit Leuven. The paper provides a rapid review and analysis of the impacts and economic costs from climate change. The objective is to provide estimates of the benefits of climate change policy, i.e. from avoided impacts, for support to the Commission in considering the benefits and costs of mitigation efforts, and to support DG Environment in its report to the Spring Council 2005 and in future international negotiations on climate change.
Contributing Partner: UNT Libraries
Water Quality: Problems in the New River and Imperial County, California

Water Quality: Problems in the New River and Imperial County, California

Date: August 5, 1999
Creator: United States. General Accounting Office.
Description: Correspondence issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO examined a number of issues concerning water quality problems in the New River and Imperial County in southern California, focusing on the: (1) types and the sources of pollutants entering the New River; (2) agencies and the organizations responsible for monitoring and regulating pollution in the New River; (3) risks to human health and the environment from water pollution in Imperial County; (4) health advisories and the precautions in place to protect the public from pollution in the New River; and (5) actions being taken to reduce the flow of pollutants into the Salton Sea."
Contributing Partner: UNT Libraries Government Documents Department
Simulation of physical and chemical processes in reservoirs: Two case studies.

Simulation of physical and chemical processes in reservoirs: Two case studies.

Date: December 2005
Creator: García Iturbe, Selma L.
Description: Managing water quality aspects requires the use of integrative tools that allow a holistic approach to this problem. Water quality models coupled to hydrodynamic models are these tools. This study presents the application of the water quality model WASP coupled to the hydrodynamic model DYNHYD for two distinct reservoirs: Lake Texoma and Tocoma Reservoir. Modeling the former included simulations of water velocities, water level, and four chemical and physical compounds: chlorides, dissolved oxygen (DO), biochemical oxygen demand (BOD), and total suspended solids (TSS); and validation of the results by comparing with observed values during March - May, 1997. The latter is still under project status and the simulation was performed in a prospective way. The analysis included simulations of water velocities under current and for expected conditions, DO and BOD. Both models, DYNHYD and WASP, fitted pretty well to observed conditions for Lake Texoma and for where Tocoma Reservoir has been planned. Considering management and decision support purposes, the role of boundary and loading conditions also was tested. For Lake Texoma, controlling boundary conditions for chlorides is a determinant factor for water quality of the system. However, DO and TSS in the reservoir are governed by additional process besides the ...
Contributing Partner: UNT Libraries
Water Quality: Better Data and Evaluation of Urban Runoff Programs Needed to Assess Effectiveness

Water Quality: Better Data and Evaluation of Urban Runoff Programs Needed to Assess Effectiveness

Date: June 29, 2001
Creator: United States. General Accounting Office.
Description: A letter report issued by the General Accounting Office with an abstract that begins "The Environmental Protection Agency (EPA) considers the contaminants in storm water runoff as a significant threat to water quality across the nation. Prompted by Congress, EPA has responded with various initiatives, including the National Pollutant Discharge Elimination System Storm Water Program, which requires more than 1,000 local governments to undertake storm water management programs. Those municipalities in Phase I of the program have been trying to reduce pollutants in storm water runoff for several years, and it is time to begin evaluating their efforts. EPA however, has not established measurable goals for this program, nor has it attempted to evaluate the program's effectiveness in reducing storm water pollution or to determine its cost. EPA attributes its inaction to inconsistent data reporting from municipalities, insufficient staff resources, and other competing priorities within the Office of Wastewater Management. Although municipalities report monitoring and cost data to EPA or state regulatory agencies annually, these agencies have not reviewed this information to determine whether it can be useful in determining the program's overall effectiveness or cost. GAO found that the reported cost information will be difficult to analyze unless EPA ...
Contributing Partner: UNT Libraries Government Documents Department
ReSource, Volume 12, 2000

ReSource, Volume 12, 2000

Date: 2000
Creator: University of North Texas
Description: ReSource magazine includes articles and notes about research at University of North Texas in various academic fields.
Contributing Partner: University Relations, Communications & Marketing department for UNT
Water Quality: Key EPA and State Decisions Limited by Inconsistent and Incomplete Data

Water Quality: Key EPA and State Decisions Limited by Inconsistent and Incomplete Data

Date: March 15, 2000
Creator: United States. General Accounting Office.
Description: A chapter report issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO provided information on the Environmental Protection Agency's (EPA) National Water Quality Inventory, focusing on whether: (1) the information in EPA's National Water Quality Inventory is reliable and representative of water quality conditions nationwide; and (2) available data are sufficient to allow state officials to make key decisions about activities required by the Clean Water Act, such as identifying waters that do not meet water quality standards and developing strategies to address those waters."
Contributing Partner: UNT Libraries Government Documents Department
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