13 research outputs found
Watershed Management on Range and Forest Lands Proceedings of the Fifth Workshop of the United States/Australia Rangelands Panel
Preface: The U.S.-Australia Cooperative Rangeland Science Program In October 1968 the governments of the United States and Australia entered into an agreement for the purpose of facilitating close cooperative activities between the scientific communities of the two countries. The joint communique issued at that time designated the U.S. National Science Foundation and the Australian Commonwealth Department of Education and Science as the coordinating agencies. Both countries were to encourage binational teamwork in research, interchanges of scientists, joint seminars, and exchanges of information. A United States-Australia Rangeland Panel was established in December 1969 to further cooperation between the two countries in the rangeland sciences. The present panel includes the following
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Water Resources Research on Forest and Rangelands in Arizona (invited)
From the Proceedings of the 1974 Meetings of the Arizona Section - American Water Resources Assn. and the Hydrology Section - Arizona Academy of Science - April 19-20, 1974, Flagstaff, ArizonaA progressive and coordinated effort is underway to provide a sound technical basis for managing water resources on forest and rangelands in the Southwest. An in-house Forest Service (USDA) research program including pilot testing and economic evaluations of multiple-use alternatives provides information necessary for this purpose. Demands for other goods and services also are increasing on these lands in the face of a burgeoning population. homeseekers, vacationers, and recreationists seek a variety of recreational. experiences that require open space and a relatively undisturbed environment. Frequently these uses conflict, and the combined pressure from too many activities can damage the environment. A new research effort has been organized in the central and southern Rocky Mountain Region to cope with these problems. Nine Western universities including Northern Arizona University, Arizona State University, and University of Arizona have joined forces with the Rocky Mountain Forest and Range Experiment Station to form the Eisenhower Consortium for Western Environmental Forestry Research. Simply stated, the consortium seeks to better our understanding of the relationships between man and his open-space environment in order that its quality might be maintained.This article is part of the Hydrology and Water Resources in Arizona and the Southwest collections. Digital access to this material is made possible by the Arizona-Nevada Academy of Science and the University of Arizona Libraries. For more information about items in this collection, contact [email protected]
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Storm Runoff and Sediment Production After Wildfire in Chaparral
From the Proceedings of the 1985 Meetings of the Arizona Section - American Water Resources Association and the Hydrology Section - Arizona-Nevada Academy of Science - April 27, 1985, Las Vegas, NevadaStormflow and sediment production increased greatly after a wildfire on three small cha3parrlal watersheds in .entral Arizona. Peaks frequently exceeded 5 m³ s⁻¹ km⁻² (450 cfg mi⁻²) when 15-minute rainfall intensity exceeded 50 mm hr⁻¹ (2 in hr⁻¹) on catchments that, before burning, responded little to intense rainfall. Source water for the flashy spates and heavy erosion was surface runoff on the severely burned, unprotected, water -repellent soils. For a few years after the fire, intense summer rains produced a disproportionate amount of the runoff and sediment. Early postfire recovery was rapid; severe flooding and erosion were over in 3 years, and within 5 to 10 years stormflows and peaks declined to near prefire levels. Postfire conversion to grass on one watershed did not appreciably change the rate of recovery.This article is part of the Hydrology and Water Resources in Arizona and the Southwest collections. Digital access to this material is made possible by the Arizona-Nevada Academy of Science and the University of Arizona Libraries. For more information about items in this collection, contact [email protected]
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Barometric Response of Water Levels in Flagstaff Municipal Wells
From the Proceedings of the 1977 Meetings of the Arizona Section - American Water Resources Assn. and the Hydrology Section - Arizona Academy of Science - April 15-16, 1977, Las Vegas, NevadaThis article is part of the Hydrology and Water Resources in Arizona and the Southwest collections. Digital access to this material is made possible by the Arizona-Nevada Academy of Science and the University of Arizona Libraries. For more information about items in this collection, contact [email protected]
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Sediment Production from a Chaparral Watershed in Central Arizona
From the Proceedings of the 1979 Meetings of the Arizona Section - American Water Resources Assn. and the Hydrology Section - Arizona - Nevada Academy of Science - April 13,1979, Tempe, ArizonaSediment production from two chaparral watersheds in central Arizona during a period of heavy winter rainfall in 1978 was compared with sediment production over a 14-year period (1964-78). Results indicate sediment production from chaparral is primarily the result of seasonal periods of heavy precipitation and runoff and not from ephemeral summer rainstorms. Sediments from 300 acres (122 ha) above a newly constructed stock watering tank were produced within a few days time in the late winter of 1978 at an accelerated annual rate of 41.1 ft /acre (2.9 m /ha). The sediments came mostly from cutting in channel alluvium in upstream tributaries where the sediments are presumed to have accumulated from downslope creep, dry ravel, and overland flow produced by ephemeral, convective rainstorms. The accelerated rate of sediment production was more than 4 times the average annual rate of 9.8 ft /acre (0.7 m /ha) determined from 14 years of cumulative sediment deposits in a stock tank constructed in 1964.This article is part of the Hydrology and Water Resources in Arizona and the Southwest collections. Digital access to this material is made possible by the Arizona-Nevada Academy of Science and the University of Arizona Libraries. For more information about items in this collection, contact [email protected]
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Stormflow Analysis of Chaparral Conversion of Small, Central Arizona Watersheds
From the Proceedings of the 1984 Meetings of the Arizona Section - American Water Resources Assn. and the Hydrology Section - Arizona-Nevada Academy of Science - April 7, 1984, Flagstaff, ArizonaA stormflow analysis was done on streamflow records from low density chaparral watersheds, located in central Arizona, that had been converted from brush to grass to determine the effect of vegetation manipulation on stormflow parameters. The Hewlett-Hibbert hydrograph separation technique was used to separate streamflow into quickflow (flashier response) and delayed flow (more controlled response). Differences in quickflow and delayed flows between treated and untreated watersheds were tested statistically by using covariance techniques based on paired watersheds. The results of the stormflow analysis showed that the conversion of brush to grass increased both quickflow and delayed flow about 30 percent. When this increase was based on an average stormflow it resulted in about a 0.04 inch rise in quickflow and a 0.01 inch rise in delayed flow. Brush to grass conversion affected the complete range of streamflows measured although the larger flows were more variable. The 30 percent increase in the quick and delayed flow components suggested that: 1) conversion produced a uniform rise in the stormflow hydrograph as opposed to affecting any single parameter, and 2) as such, produced no major changes in the runoff patterns.This article is part of the Hydrology and Water Resources in Arizona and the Southwest collections. Digital access to this material is made possible by the Arizona-Nevada Academy of Science and the University of Arizona Libraries. For more information about items in this collection, contact [email protected]