Open-File Report 02-112

Preliminary United States - Mexico Border Watershed Analysis, Twin Cities Area Of Nogales, Arizona And Nogales, Sonora

by Laura Margaret Brady1, Floyd Gray1, Mario Castaneda2, Mark Bultman1, and Karen Sue Bolm1

2002

1U.S. Geological Survey, Tucson, Arizona
2Arizona Department of Environmental Quality, Phoenix, Arizona

The United States - Mexico border area faces the challenge of integrating aspects of its binational physical boundaries to form a unified or, at least, compatible natural resource management plan. Specified geospatial components such as stream drainages, mineral occurrences, vegetation, wildlife, and land-use can be analyzed in terms of their overlapping impacts upon one another. Watersheds have been utilized as a basic unit in resource analysis because they contain components that are interrelated and can be viewed as a single interactive ecological system. In developing and analyzing critical regional natural resource databases, the Environmental Protection Agency (EPA) and other federal and non-governmental agencies have adopted a "watershed by watershed" approach to dealing with such complicated issues as ecosystem health, natural resource use, urban growth, and pollutant transport within hydrologic systems.

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