National Water-Quality Assessment Program: Central Arizona Basins

Cordy, Gail E.

doi:10.3133/fs01694

Cited by 4 publications

(5 citation statements)

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“…Average annual precipitation ranges from about 64 cm to 102 cm at the higher elevations in the northern part of the study area and from about 15 cm to 25 cm in the lower elevations in the southern part. About 90 to 99 percent of precipitation is evaporated or transpired by plants (Cordy, 1994). Consequently, many water courses in the area are intermittent or ephemeral.…”

Section: Description Of Study Areamentioning

confidence: 99%

Organochlorine compounds in streambed sediment and in biological tissue from streams and their relations to land use, central Arizona

Gebler¹

2000

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The mission of the U.S. Geological Survey (USGS) is to assess the quantity and quality of the earth resources of the Nation and to provide information that will assist resource managers and policymakers at Federal, State, and local levels in making sound decisions. Assessment of water-quality conditions and trends is an important part of this overall mission. One of the greatest challenges faced by water-resources scientists is acquiring reliable information that will guide the use and protection of the Nation's water resources. That challenge is being addressed by Federal, State, interstate, and local water-resources agencies and by many academic institutions. These organizations are collecting water-quality data for a host of purposes that include: compliance with permits and water-supply standards; development of remediation plans for a specific contamination problem; operational decisions on industrial, wastewater, or water-supply facilities; and research on factors that affect water quality. An additional need for water-quality information is to provide a basis on which regional and national-level policy decisions can be based. Wise decisions must be based on sound information. As a society we need to know whether certain types of water-quality problems are isolated or ubiquitous, whether there are significant differences in conditions among regions, whether the conditions are changing over time, and why these conditions change from place to place and over time. The information can be used to help determine the efficacy of existing water-quality policies and to help analysts determine the need for and likely consequences of new policies. To address these needs, the Congress appropriated funds in 1986 for the USGS to begin a pilot program in seven project areas to develop and refine the National Water-Quality Assessment (NAWQA) program. In 1991, the USGS began full implementation of the program. The NAWQA program builds upon an existing base of water-quality studies of the USGS, as well as those of other Federal, State, and local agencies. The objectives of the NAWQA program are to: • Describe current water-quality conditions for a large part of the Nation's freshwater streams, rivers, and aquifers. • Describe how water quality is changing over time. • Improve understanding of the primary natural and human factors that affect water-quality conditions. This information will help support the development and evaluation of management, regulatory, and monitoring decisions by other Federal, State, and local agencies to protect, use, and enhance water resources. The goals of the NAWQA program are being achieved through ongoing and proposed investigations of 60 of the Nation's most important river basins and aquifer systems, which are referred to as study units. These study units are distributed throughout the Nation and cover a diversity of hydrogeologic settings. More than two-thirds of the people served by public water-supply systems live within their boundaries. National synthesis of data analysis, based on aggre...

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Section: Description Of Study Areamentioning

confidence: 99%

Organochlorine compounds in streambed sediment and in biological tissue from streams and their relations to land use, central Arizona

Gebler¹

2000

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“…The major water-quality issues identified in the CAZB study area by a liaison committee composed of representatives from a variety of local, State, and Federal agencies, as well as educational and volunteer organizations (Cordy, 1994) with interests in water quality are: Nitrate in ground water from natural and anthropogenic sources at concentrations that exceed National drinking-water standards;…”

Section: Overview Of Water Qualitymentioning

confidence: 99%

Water-quality assessment of the Central Arizona Basins, Arizona and northern Mexico – Environmental setting and overview of water quality

Cordy¹,

Rees²,

Edmonds³

et al. 1998

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The mission of the U.S. Geological Survey (USGS) is to assess the quantity and quality of the earth resources of the Nation and to provide information that will assist resource managers and policymakers at Federal, State, and local levels in making sound decisions. Assessment of water-quality conditions and trends is an important part of this overall mission. One of the greatest challenges faced by water-resources scientists is acquiring reliable information that will guide the use and protection of the Nation's water resources. That challenge is being addressed by Federal, State, interstate, and local water-resources agencies and by many academic institutions. These organizations are collecting water-quality data for a host of purposes that include: compliance with permits and water-supply standards; development of remediation plans for a specific contamination problem; operational decisions on industrial, wastewater, or water-supply facilities; and research on factors that affect water quality. An additional need for water-quality information is to provide a basis on which regional and national-level policy decisions can be based. Wise decisions must be based on sound information. As a society we need to know whether certain types of water-quality problems are isolated or ubiquitous, whether there are significant differences in conditions among regions, whether the conditions are changing over time, and why these conditions change from place to place and over time. The information can be used to help determine the efficacy of existing waterquality policies and to help analysts determine the need for and likely consequences of new policies. To address these needs, the Congress appropriated funds in 1986 for the USGS to begin a pilot program in seven project areas to develop and refine the National Water-Quality Assessment (NAWQA) program. In 1991, the USGS began full implementation of the program. The NAWQA program builds upon an existing base of water-quality studies of the USGS, as well as those of other Federal, State, and local agencies. The objectives of the NAWQA program are to: Describe current water-quality conditions for a large part of the Nation's freshwater streams, rivers, and aquifers. Describe how water quality is changing over time. Improve understanding of the primary natural and human factors that affect water-quality conditions. This information will help support the development and evaluation of management, regulatory, and monitoring decisions by other Federal, State, and local agencies to protect, use, and enhance water resources. The goals of the NAWQA program are being achieved through ongoing and proposed investigations of 60 of the Nation's most important river basins and aquifer systems, which are referred to as study units. These study units are distributed throughout the Nation and cover a diversity of hydrogeologic settings. More than two-thirds of the people served by public water-supply systems live within their boundaries. National synthesis of data analysis, based on aggregation ...

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“…Overall, water is used primarily for crop irrigation and other agricultural uses; however, as the statewide population increases, the demand for good-quality drinking water will increare. Land used for agriculture could be a source of pesticides and other chemical constituents in ground water (Cordy, 1994).…”

Section: Introductionmentioning

confidence: 99%

Converting contour-line data into data sets for a multilayered aquifer using a geographic information system

Rees¹

1999

Open-File Report

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National Water-Quality Assessment Program: Central Arizona Basins

Cited by 4 publications

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Organochlorine compounds in streambed sediment and in biological tissue from streams and their relations to land use, central Arizona

Organochlorine compounds in streambed sediment and in biological tissue from streams and their relations to land use, central Arizona

Water-quality assessment of the Central Arizona Basins, Arizona and northern Mexico – Environmental setting and overview of water quality

Converting contour-line data into data sets for a multilayered aquifer using a geographic information system

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