• Calcite Precipitation in Lake Powell (Abstract)

      Reynolds, Robert C., Jr.; Department of Earth Sciences, Dartmouth College (Arizona-Nevada Academy of Science, 1973-05-05)
    • Improvement of Water Quality by Air Bubbling to Eliminate Thermal Stratification in Upper Lake Mary, Arizona (Abstract)

      McGavock, E. H.; Blee, J. W. H.; Water Resources Division, U. S. Geological Survey, Flagstaff, Arizona (Arizona-Nevada Academy of Science, 1973-05-05)
    • A Public Weighting of Four Societal Goals in Arizona and Oregon

      Kimball, D. B.; Gum, R. L.; Roefs, T. G.; Department of Hydrology and Water Resources, University of Arizona (Arizona-Nevada Academy of Science, 1973-05-05)
    • Invited Topical Speaker: Warren Viessman, Jr., Urban Hydrology--State-of-the-Art

      Viessman, Warren, Jr.; Nebraska Water Resources Research Institute (Arizona-Nevada Academy of Science, 1973-05-05)
    • Chemical and Biological Problems in the Grand Canyon

      Department of Hydrology and Water Resources, University of Arizona, Tucson, Arizona (Arizona-Nevada Academy of Science, 1973-05-05)
      A survey of chemical and bacteriological water quality in the Grand Canyon was undertaken to assess possible health hazards to river travelers. The water quality of the main Colorado River channel is relatively stable with only slight increases in ionic concentration and bacteriological load with respect to distance from Lee Ferry and time over the summer season. The tributary streams show extreme temporal variability in chemical water quality and bacteriological contamination as a result of the summer rain and flood patterns in the tributary canyons. These side streams pose a definite health hazard to unwary river travelers. More extensive sampling is called for to determine the sources of this contamination and to protect the quality of the Grand Canyon experience.
    • Effect of Urbanization on Runoff from Small Watersheds

      Kao, Samuel E.; Fogel, Martin M.; Resnick, Sol D.; Water Resources Research Center, The University of Arizona, Tucson, Arizona 85721 (Arizona-Nevada Academy of Science, 1973-05-05)
      Hydrologic data collected from three small urban watersheds and one rural watershed were analyzed for the purpose of investigating the effect of urbanization on runoff. A procedure developed by the Soil Conservation Service was used to explain the relationship between the amount of rainfall and runoff. It was noted that the runoff curve number, a parameter of the method, increased as the percentage of impervious area increased. Also, there was evidence that a linear relationship existed between the runoff volume and its corresponding peak rate.
    • Use of Stock Ponds for Hydrologic Research on Southwest Rangelands

      Simanton, J. R.; Osborn, H. B.; USDA, ARS Soil, Water, and Air Sciences; Southwest Rangeland Watershed Research Center, Tucson, Arizona (Arizona-Nevada Academy of Science, 1973-05-05)
      Five livestock watering ponds on the walnut gulch experimental watershed were instrumented to evaluate the use of these ponds as a method for comparing rainfall amounts with runoff sediment volumes. Pond drainage area, vegetative cover, soil type, percent slope, and years of record were tested. Instrumentation consisted of water level recorders, and a topographic survey of each stock pond to ascertain its storage capacity. The results to date have been insufficient to reach definite conclusions due to instrumentation and surveying problems, and because of the natural variability of thunderstorm rainfall. Since most of these problems have now been corrected, future data should yield valuable hydrologic data for semiarid rangelands by means of these instrumented stock ponds.
    • Land Treatment for Urban Waste Water Management

      Lorah, William L.; Wright, Kenneth R.; Wright Water Engineers, Inc.; Wright-McLaughlin Engineers (Arizona-Nevada Academy of Science, 1973-05-05)
    • Probability Distributions of Snow Course Data for Central Arizona

      Carv, Lawrence E.; Beschta, Robert L.; Department of Watershed Management, University of Arizona, Tucson 85721 (Arizona-Nevada Academy of Science, 1973-05-05)
      A preliminary study of probability distributions for use on snowpack accumulation in the central Arizona highlands was made from 22 snow courses selected as having 10 or more years of available records. Due to the frequent occurrence of zero water equivalent value, application of a single continuous probability distribution is precluded. By means of two distributions, however, the snowpack water equivalent can be assessed by a binomial distribution describing the probability of snow, and a lognormal distribution describing the probability of water equivalent. The area chosen for detailed analysis is where the headwaters of many of Arizona's major river systems occur.
    • The Significance of Logistics to Hydrology (Abstract)

      McCarthy, J. R. (Arizona-Nevada Academy of Science, 1973-05-05)
    • Hydrology and Water Resources in Arizona and the Southwest, Volume 3 (1973)

      Unknown author (Arizona-Nevada Academy of Science, 1973-05-05)
    • Public Perception of Water Quality as a Planning Tool

      Judge, R. M.; Gum, R. L.; Department of Hydrology and Water Resources, University of Arizona (Arizona-Nevada Academy of Science, 1973-05-05)
    • Invited Topical Speaker: Sol Resnick, Impact on the Environment by Water Resources Development (Abstract)

      Resnick, Sol; Water Resources Research Center (Arizona-Nevada Academy of Science, 1973-05-05)
    • A Preliminary Assessment of Snowfall Interception in Arizona Ponderosa Pine Forest

      Tennyson, Larry C.; Ffolliott, Peter F.; Thorud, David S.; Department of Watershed Management, University of Arizona, Tucson 85721 (Arizona-Nevada Academy of Science, 1973-05-05)
      A preliminary assessment and ranking of the relative significance of five processes that may contribute to snow removal from ponderosa pine forest canopies was made, including wind erosion of canopy snow, snowslide from the canopy, stemflow, vapor transport from melt water, and vapor transport of canopy snow. The first three represent delayed delivery rather than net water loss. A snow load index was obtained through use of time lapse photography of the study site canopy, while incoming solar radiation and atmospheric processes were monitored. The snow load index was expressed as a ratio of forest canopy area covered with snow to the total canopy area. Results obtained over a 4-day period following a six-hour snowstorm showed that snow removal by snowslide and wind erosion was of significant importance, while vapor transport of melt water and canopy snow, stemflow, and dripping of melt water was of comparatively minor importance.
    • Salinity Problems of the Safford Valley: An Interdisciplinary Analysis

      Muller, Anthony B.; Department of Hydrology and Water Resources, University of Arizona, Tucson (Arizona-Nevada Academy of Science, 1973-05-05)
      A change in groundwater quality, averaging approximately +0.13 millimhos electrical conductivity and +35 ppm chloride per year, has been documented between 1940 and 1972 with data from ten long -term sample wells. The decrement in the water quality of the surficial aquifer seems to be attributable to four major mechanisms. An increase in salinity may be expected from leakage of saline water from the artesian aquifer. Such leakage would be stimulated by pumping- caused reduction of confining pressure, and by the puncture of the cap beds by deep wells. Water reaching the aquifer from natural recharge may contribute salts to the system. Such recharging water, if passed through soluble beds, could contribute to the salt. Lateral movement of water through similar deposits may be a contribution, and the concentration and infiltration of agricultural water could also add to aquifer salinity. The economic analysis of the Safford Valley, based on the modeling of a "Representative Farm" analog, indicates that cotton will remain economical to produce on the basis of the projected salinity trends, for a significant time beyond limits of prediction. The analysis indicates that the optimum salt-resistant crops for the area are being cultivated, and, of these, alfalfa will cease to be productive in large areas of the valley by 1990. The entire valley will not produce alfalfa for profit by 2040. The methodologies shown in the paper indicate how pumping influences salinity change and outline salinity control recommendations for the area.
    • A Jeep-Mounted Rainfall Simulating Infiltrometer

      Henkle, William R.; Northern Arizona University (Arizona-Nevada Academy of Science, 1973-05-05)
      An infiltrometer was designed to more closely simulate natural storm characteristics and still maintain sufficient portability to be used in various test sites in the field. In addition to portability, a relatively large test plot can be used over a relatively long duration. The instrument is designed to produce rainfall intensities of 2 to 6 inches per hour which are comparable to natural storm intensities found in northern Arizona. Capillary tubes produce water drops of equivalent kinetic energy at impact to natural raindrops. Errors due to lateral flow are minimized through peripheral wetting. Mounting the infiltrometer on a four-wheel drive vehicle allows nearly the portability of a hand carried unit with a greater water carrying capacity and allows the equipment to be large enough to test a representative plot.
    • Groundwater Recharge from a Portion of the Santa Catalina Mountains

      Belan, R. A.; Matlock, W. G.; Soils, Water and Engineering Department, The University of Arizona, Tucson (Arizona-Nevada Academy of Science, 1973-05-05)
      The geohydrology of a portion of the Santa Catalina Mountains including the definition of aquifer systems in the foothills was studied in order to calculate groundwater recharge to the Tucson basin. This underlying groundwater aquifer is the only source of Tucson, Arizona's water supply. A well network, well logs, geologic profiles, and a water level contour map were used as source information. Recharge was found to occur in some sections of washes and close to the mountains where washes cross or coincide with faults. Significant recharge to sand and gravel aquifers occurs directly through faults and joints. Little of the surface runoff is thought to recharge local aquifers because of low permeability layers beneath the alluvium and the short duration of the flows. Recharge calculation using the Darcy equation was subject to considerable error; but flow net analysis showed the total recharge to be 336 acre-feet per year representing about 50 acre feet per mile of mountain front per year.
    • Invited Topical Speaker: John D. Hem, Water-Quality Studies Today and Tomorrow

      Hem, John D.; U.S. Geological Survey, Menlo Park, California (Arizona-Nevada Academy of Science, 1973-05-05)
      Development of better instruments for analysis and automation have greatly increased the available information on quality of water during the past decade. There remains a need for further research on relationships between dissolved material and the solids in contact with water in order to cope with existing or potential problems in water quality such as the extent to which lead from automobile exhausts may contaminate water supplies, or the safety of disposal of toxic wastes into deep saline aquifers.
    • Penetrability and Hydraulic Conductivity of Dilute Sulfuric Acid Solutions in Selected Arizona Soils

      Miyamoto, S.; Ryan, J.; Bohn, H. L.; Department of Soils, Water and Engineering, College of Agriculture, The University of Arizona, Tucson 85721 (Arizona-Nevada Academy of Science, 1973-05-05)
      Measurements of penetrability and hydraulic conductivity in calcareous soils treated with a dilute sulfuric acid solution showed a severe decrease in conductivity with increasing concentrations over 1000 ppm. A slight decrease in penetrability was observed. Carbon dioxide evolution appeared to be responsible for flow reduction and temporary cessation at 10,000 ppm and 20,000 ppm. In sodic soils penetrability and conductivity increased markedly with sulfuric acid concentrations between 1,000 and 10,000 ppm. For a neutral soil, penetrability decreased with increasing sulfuric acid concentrations, and the stable conductivity for 500 to 5,000 ppm was higher than for water alone. The findings suggest that disposal of sulfuric acid concentrations greater than 1,000 ppm will result in plugging by carbon dioxide. In sodic soils the possibility exists of using sulfuric acid solutions for reclaiming salt and sodium-affected soils.