• A 12-Year, Post-Wildfire Geomorphologic Evaluation of Ellison Creek, Central Arizona

      Medina, Alvin L.; Royalty, Rebecca K.; Rocky Mountain Research Station (Arizona-Nevada Academy of Science, 2002-04-06)
    • Academic Training for Groundwater Quality Specialists

      Schmidt, Kenneth D. (Arizona-Nevada Academy of Science, 1976-05-01)
    • Accessing Watershed-Related Data Sets Through the World Wide Web

      Baker, Malchus B., Jr.; Huebner, Daniel P.; Ffolliott, Peter F.; USDA Forest Service, Rocky Mountain Research Station, Flagstaff, Arizona; School of Renewable Natural Resources, University of Arizona, Tucson, Arizona (Arizona-Nevada Academy of Science, 2000-04-15)
    • Accumulation of Heavy Metals and Petroleum Hydrocarbons in Urban Lakes: Preliminary Results

      Amalfi, Frederick A.; Sommerfeld, Milton R.; Department of Botany, Arizona State University, Tempe, Arizona 85287 (Arizona-Nevada Academy of Science, 1988-04-16)
      A preliminary survey of several urban lakes in the Phoenix metropolitan area was undertaken to assess the degree of accumulation of priority pollutant metals and petroleum -based hydrocarbons in these impoundments. Three sediment samples were collected from each lake along a transect (from a probable point of stormwater addition to the opposite shore), and were composited on an equal weight basis prior to analysis. Total petroleum hydrocarbon concentrations ranged from 30 to 8000 mg /kg dry weight. The concentration ranges (mg /kg dry weight) of total metals were: arsenic 7-26, copper 25-2800, chromium 14-55, nickel 5-40, lead < 1-138, selenium < 0.5-1.1, and zinc 33-239. Silver and cadmium were undetectable (< 5.0 and < 0.5 mg /kg, respectively). Factors that may be associated with the magnitude of accumulation in urban lakes include lake age, primary source of influent, reception of stormwater runoff, mechanical aeration of the water, and direct chemical addition.
    • Action Programs for Water Yield Improvement on Arizona's Watersheds: Political Constrains to Implementation

      Cortner, H. J.; Berry, M. P.; School of Renewable Natural Resources, University of Arizona; Department of Forestry, University of Wisconsin (Arizona-Nevada Academy of Science, 1978-04-15)
      Although the Arizona Watershed Program 's (AWP) research efforts have had considerable success over the past 22 years in its objective to further knowledge of the feasibility of vegetative manipulation and modification as a method of increasing surface water yields, its principal sponsor and supporter, the Arizona Water Resources (AWRC), has not, to date, met with similar success. Described are three of the AWRC 's unsuccessful attempts to implement on-going action programs of vegetative management for water yield improvement: The Barr Report, the Ffolliott-Thorud Report, and the Globe Chaparral controversy, to illustrate how overstated program goals, unrealistic assumptions about the political feasibility of treatment types, extent, and intensity; failure to recognize the emergence of significant new decision-making participants, and unsettled questions concerning program costs and beneficiaries have contributed to setbacks in these programs. It is suggested that political as well as scientific constraints have accounted for reported failures in the implementation of the AWP action program objectives.
    • Adaptability of a Daily Rainfall Disaggregation Model to the Midwestern United States

      Econopouly, Thomas W.; Davis, D. R.; Woolhiser, D. A. (Arizona-Nevada Academy of Science, 1987-04-18)
    • Addition of a Carbon Pulse to Stimulate Denitrification in Soil Columns Flooded with Sewage Water

      Lance, J. C.; Gilbert, R. G.; U. S. Water Conservation Laboratory, Phoenix, Arizona 85040 (Arizona-Nevada Academy of Science, 1976-05-01)
    • Aerial Snowpack Mapping

      Warksow, William L.; Salt River Project, Phoenix, Arizona (Arizona-Nevada Academy of Science, 1975-04-12)
      Arizona's continued growth and development depends upon sound management of water resources, especially melted snow which is the primary source of water for the 1.1. Million residents of Maricopa county. The method for snowpack information gathering practiced by watershed specialists of the Salt River project in Arizona is described. The method is outlined, describing aircraft reconnaissance, direct enroute mapping of extent and depth of snowpack, and techniques for identifying ice and/or melt conditions. Under optimal conditions, this technique is considered more than acceptable for determining snowpack levels. Limitations of the technique result from the observer's tolerance of vertigo which can arise under flying conditions; cloud cover, which can reduce contrast and shadows thereby reducing accuracy of observation; and vegetation zones where density of plant matter screens much of the snow.
    • An Agroforestry Demonstration in Avra Valley of Southeastern Arizona

      Fowler, Wm. Patrick; Ffolliott, Peter F.; School of Renewable Natural Resources, University of Arizona, Tucson, Arizona (Arizona-Nevada Academy of Science, 1986-04-19)
    • The Alternatives and Impacts Associated with a Future Water Source Transition for Tucson Water

      McLean, Thomas M.; Davis, Stephen E.; Tucson Water, Tucson, Arizona 85726 (Arizona-Nevada Academy of Science, 1981-05-02)
      Anticipating a surge in the future growth of the Tucson urban area accompanied by a need for the preservation of the local groundwater resource, Tucson Water is planning for a major transition in its source of supply during the next fifty years. The completion of the Central Arizona Project to the Tucson area represents the primary ingredient to the formulation of a future water supply plan for the community. Tucson, which presently relies totally upon groundwater for its potable water supply, is diligently preparing to accept its first surface water source. The task of planning for this event is extremely complex and is further hampered by the fact that many critical factors relating to the Tucson Division of the Central Arizona Project are yet undefined. Tucson Water engineers utilize contemporary computerized hydraulic models as tools to define an array of technical solutions to the problem of accomplishing a major conversion from a multi-point system source to a predominantly single source of supply. Elements such as construction, operation, and maintenance costs associated with water treatment and delivery systems are addressed.
    • An Analysis of Human Settlement Impacts on Riparian Areas in the Beaver Creek Watershed in North Central Arizona

      Phillips, Patrick; Tecle, Aregai; Northern Arizona University, Flagstaff (Arizona-Nevada Academy of Science, 2002-04-06)
    • Analysis of Natural Ground-water Level Variations for Aquifer Conceptualization

      Nevulis, R.; Davis, D.; Sorooshian, S.; Wolford, R.; University of Arizona, Department of Hydrology and Water Resources, Tucson, AZ 85721 (Arizona-Nevada Academy of Science, 1987-04-18)
      Statistical evaluations of time-series ground-water level data can be used to infer ground-water flow concepts. Advantages of such passive methods of analysis may include relative simplicity, low cost, and avoidance of disturbances typically associated with stress testing of aquifers. In this analysis, selected statistical methods were used to draw inferences on the characteristics of an aquifer within the Columbia River basalts in the Pasco Basin of southcentral Washington. This information will be used in developing a conceptual model of ground water flow and in the planning of future hydrologic field investigations.
    • An Analysis of Recession Flows from Different Vegetation Types

      Sulaiman, Wan Norazmin bin; Ffolliott, Peter F.; School of Renewable Natural Resources, University of Arizona (Arizona-Nevada Academy of Science, 1981-05-02)
    • An Analysis of the Propose Decommissioning of the Fossil Creek Dam, Near Strawberry, Arizona

      Jones, Charles E., Jr.; Phillips, Patrick; Northern Arizona University, Flagstaff (Arizona-Nevada Academy of Science, 2001-04-14)
    • Analysis of Wastewater Land Treatment Systems in the Phoenix Urban Area

      Ewing, R. L.; Boyle Engineering Corporation, Phoenix Brance Office (Arizona-Nevada Academy of Science, 1978-04-15)
      As a part of the ongoing Phoenix Urban Study, Federal legislation mandates that land treatment of wastewater be seriously considered as a treatment option. Land treatment is a particularly viable alternative in the Phoenix area because in this arid desert climate, all water is a scarce and valuable resource and land treatment offers a positive opportunity for the conservation of this resource. In addition, land treatment systems are generally less expensive and have lower energy requirements than other conventional treatment processes while resulting in comparable treatment. The analysis of wastewater treatment systems for populated urban areas necessitates the preliminary investigation and comparison of a large number of alternatives to allow for a realistic engineering and economic evaluation. The site specific nature of land application adds additional variables that must be considered. A preliminary systems approach indicated that to minimize the effect of a human judgement factor between sites and yet maximize the depth of the initial analysis, computer techniques should be utilized for analysis and data storage. A summary of this analysis with appropriate cost, power usage, land requirements and other pertinent factors will be presented.
    • An Analysis of Yearly Differences in Snowpack Inventory-Prediction Relationships

      Ffolliott, Peter F.; Thorud, David B.; Enz, Richard W.; Department of Watershed Management, University of Arizona, Tucson 85721; USDA Soil Conservation Service, Phoenix, Arizona 85025 (Arizona-Nevada Academy of Science, 1972-05-06)
      Inventory-prediction relationships between snowpack conditions and forest attributes may be useful in estimating water yields derived from snow, but such relationships are developed usually from source data collected over a short time period. Analyses of long-term data suggest inventory-prediction relationships developed from limited data may have more general application, however. Available records from 18 snow courses in the ponderosa pine type in Arizona provided source data in this study, which was designed to empirically analyze inventory-prediction relationships developed from long-term snow survey records. The primary hypothesis tested and evaluated by statistically analyzing the family of regression equations representing a snow course, was that, given a precipitation input, the distribution of snowpack water equivalent at peak seasonal accumulation is determined by the spatial arrangement of the forest cover, e.g. basal area. Generally 12 of the 18 snow courses evaluated appeared to support the hypothesis, three courses did not, and three courses were considered inconclusive.
    • Analyzing the Feasibility for Rerouting the Rio de Flag in Flagstaff, Arizona

      Poff, Boris; Tappan, Richard; Morgan, Loretta G.; School of Forestry, Northern Arizona University (Arizona-Nevada Academy of Science, 2001-04-14)
    • An Annual Water Budget for Emory Oak Woodlands: An Initial Approximation

      Ffolliott, Peter F.; School of Renewable Natural Resources, University of Arizona, Tucson (Arizona-Nevada Academy of Science, 2000-04-15)
    • Annual Water Yield Using Precipitation and Temperature: Grunsky's Equation Reconsidered

      Hawkins, Richard H; Santos, Francisco L.; School of Natural Resources, University of Arizona, Tucson, Arizona; University of Evora, ICAAM, Portugal (Arizona-Nevada Academy of Science, 2009-04-04)
    • Antritranspirants as a Possible Alternative to the Eradication of Saltcedar Thickets

      Cunningham, Robert S.; Brooks, Kenneth N.; Thorud, David B.; School of Renewable Natural Resources, University of Arizona, Tucson, Arizona (Arizona-Nevada Academy of Science, 1975-04-12)
      The response of saltcedar (Tamarix pentandra Pall.) to several antitranspirants was evaluated in laboratory, greenhouse and small -scale field studies using potted plants. Anti - transpirants may provide a treatment alternative to the eradication of saltcedar thickets for water salvage objectives. Transpiration rates were reduced by 23 to 44 percent for 7 to 20 days in the greenhouse, and by 18 to 32 percent for 2 to 8 days in the field. No serious damage to the plants was apparent. One of the most effective antitranspirants considered for a hypothetical saltcedar thicket and a hypothetical operational treatment program, based on estimated cost data, would result in reallocated water costing approximately 55 dollars per acre foot for a single treatment. About 19 acres of saltcedar thicket would have to be treated to provide one acre -foot of reallocated water in this case.