Results 201 to 210 of about 89,092 (237)
Geomorphic evolution of the San Pedro River channel since 1900 in the San Pedro Riparian National Conservation Area, southeast Arizona [PDF]
Open-File Report, 1992 Richard Hereford
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Determination of toxicity levels in the San Pedro River Watershed, Aguascalientes, Mexico
Journal of Environmental Science and Health, Part A, 2007A quantitative study of toxicity levels of the San Pedro River and its main tributaries around the city of Aguascalientes, Mexico was conducted. Our study determined individual CL(50) values for each sampling point at 3 different times of the year corresponding to the main seasons of the year in terms of the hydrological cycle (dry, low rain and high ...
Gustavo Emilio, Santos-Medrano +4 more
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Santa Cruz-San Pedro River Basin, Arizona: Main Report
1977Excerpts from the report: This report presents information in terms of two separate study areas, the Santa Cruz and the San Pedro areas. It covers 16,501 square miles of southeastern Arizona and includes all or portions of six counties (Cochise, Graham, Santa Cruz, Pima, Pinal, and Maricopa), the Coronado National Forest, fourteen natural resource ...
Soil Conservation Service +5 more
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Symposium on the Application of Geophysics to Engineering and Environmental Problems 2002, 2002
Ground-water flow to the ecologically important San Pedro River in southeastern Arizona is restricted by the distribution of underlying silt and clay layers. A better understanding of the distribution of these layers is needed to determine the effects of groundwater withdrawals on river flow.
John Fleming, Don Pool, Jim Leenhouts
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Ground-water flow to the ecologically important San Pedro River in southeastern Arizona is restricted by the distribution of underlying silt and clay layers. A better understanding of the distribution of these layers is needed to determine the effects of groundwater withdrawals on river flow.
John Fleming, Don Pool, Jim Leenhouts
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Santa Cruz-San Pedro River Basin, Arizona: Resource Inventory
1977Excerpts from the report: The Santa Cruz-San Pedro River Basins study area is located in southeastern Arizona. It includes 16,501 square miles located in parts of Pima, Cochise, Pinal, Santa Cruz, Graham, and Maricopa Counties. The boundaries of the study area are determined by the drainage areas of the Santa Cruz River, San Pedro River, Willcox Playa,
Soil Conservation Service +5 more
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Using Conservation Easements to Save the Upper San Pedro River
Federal Facilities Environmental Journal, 2002AbstractThis article will discuss how Fort Huachuca, in cooperation with The Nature Conservancy and the Bureau of Land Management (BLM), has become the first Army installation to use conservation easements2 to fulfill its responsibility under the Endangered Species Act to conserve endangered and threatened species dependent upon the Upper San Pedro ...
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Environmental Monitoring and Assessment, 2004
Studies of future management and policy options based on different assumptions provide a mechanism to examine possible outcomes and especially their likely benefits and consequences. The San Pedro River in Arizona and Sonora, Mexico is an area that has undergone rapid changes in land use and cover, and subsequently is facing keen environmental crises ...
William G, Kepner +4 more
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Studies of future management and policy options based on different assumptions provide a mechanism to examine possible outcomes and especially their likely benefits and consequences. The San Pedro River in Arizona and Sonora, Mexico is an area that has undergone rapid changes in land use and cover, and subsequently is facing keen environmental crises ...
William G, Kepner +4 more
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Bacterial Community Changes during Plant Establishment at the San Pedro River Mine Tailings Site
Journal of Environmental Quality, 2007AbstractMine tailings are moderately to severely impacted sites that lack normal plant cover, soil structure and development, and the associated microbial community. In arid and semiarid environments, tailings and their associated contaminants are prone to eolian dispersion and water erosion, thus becoming sources of metal contamination.
Karyna, Rosario +6 more
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Streamside herbaceous vegetation response to hydrologic restoration on the San Pedro River, Arizona
Ecohydrology, 2009AbstractRecovery of physical conditions and processes is increasingly emphasized in ecosystem restoration. We examined a restoration project aimed at recovery of groundwater levels and base flows on an undammed desert river. We sampled streamside plant communities and hydrology annually (2003–2008) at six restoration sites at two farms (Three Links ...
Gabrielle L. Katz +2 more
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Fact Sheet, 2006
In response to a need to better understand how ground-water and streamflow conditions are related to riparian vegetation condition and water use, a study was completed by the U.S. Geological Survey, Arizona State University, and the Department of AgricultureARS.
James M. Leenhouts +2 more
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In response to a need to better understand how ground-water and streamflow conditions are related to riparian vegetation condition and water use, a study was completed by the U.S. Geological Survey, Arizona State University, and the Department of AgricultureARS.
James M. Leenhouts +2 more
openaire +1 more source