From the Proceedings of the 1980 Meetings of the Arizona Section - American Water Resources Assn. and the Hydrology Section - Arizona - Nevada Academy of Science - April 11-12, 1980, Las Vegas, Nevada / This paper examines the effects of random errors in the precision of latent energy estimates from the Bowen ratio model. The analysis identifies improvements in the instrumentation and in the field measurement techniques. Bowen ratio energy budget measurements were made over an extensive stand of mesquite (Prosopis pubescens) in the San Pedro River valley near Mammoth, Arizona. The error analysis indicated mean half -hour 95 percent confidence intervals for latent energy and sensible heat flux of 0.48 ± 0.09 and 0.21 ± 0.09 cal/cm²/min, respectively. A majority of the random error was associated with the temperature and humidity measurements used in the Bowen ratio model. Psychrometer circuitry and calibration procedures were modified to reduce measurement errors. Subsequent Bowen ratio measurements were made over a kochea (Kochea scoparia) pasture adjacent to the Pecos River near Roswell, New Mexico. The improvements were effective in reducing the mean half-hour 95 percent confidence intervals for latent energy and sensible heat flux to 0.27 ± 0.01 and 0.23 ± 0.01 cal/cm²/min, respectively.

From the Proceedings of the 1980 Meetings of the Arizona Section - American Water Resources Assn. and the Hydrology Section - Arizona - Nevada Academy of Science - April 11-12, 1980, Las Vegas, Nevada

From the Proceedings of the 1980 Meetings of the Arizona Section - American Water Resources Assn. and the Hydrology Section - Arizona - Nevada Academy of Science - April 11-12, 1980, Las Vegas, Nevada

From the Proceedings of the 1980 Meetings of the Arizona Section - American Water Resources Assn. and the Hydrology Section - Arizona - Nevada Academy of Science - April 11-12, 1980, Las Vegas, Nevada

From the Proceedings of the 1980 Meetings of the Arizona Section - American Water Resources Assn. and the Hydrology Section - Arizona - Nevada Academy of Science - April 11-12, 1980, Las Vegas, Nevada / A mound and valley water harvesting system was installed adjacent to Peabody Coal Company's Kayenta mine on Black Mesa in the spring of 1979. The project is testing the effects of four water catchment treatments (natural, seeded, compacted, and salted and compacted) on the establishment and production of four plant species (yellow clover, crested wheatgrass, four-wing saltbush, and western wheatgrass). The site consists of three parallel mounds or catchment areas (with 13 to 16% slope) alternating with two topsoiled (10 to 12 inches deep) collection valleys (800 feet long and 120 feet apart). This past growing season was dry (3.35 inches). Despite the drought, plants did establish and survive. The plant density was not high, but it greatly exceeded that of Peabody's reclaimed and planted areas. Even in places where some plants germinated early in the season, the subsequent dry period took an extremely high toll. At present the vegetation on the site is undergoing severe stress, but with decreasing temperatures it appears likely that survival will remain satisfactory until freezing weather. By using this technique the average cost per acre reclaimed could be reduced significantly.

From the Proceedings of the 1980 Meetings of the Arizona Section - American Water Resources Assn. and the Hydrology Section - Arizona - Nevada Academy of Science - April 11-12, 1980, Las Vegas, Nevada / The responses of mined -land and natural soil materials to additions of various salt solutions in irrigation water from water harvesting were evaluated by an experimental soil column study. A pilot water harvesting agrisystem on the Black Mesa in northeastern Arizona was the source of data and soil materials used in the study. A salt leaching simulation model provided predictions for comparison to the experimental results. In general, Na, Ca, and Mg were all easily leached from both soil materials, with higher concentrations yielded from the minespoil. When sodium was applied in solution, the minespoil accumulated 20% of the amount applied in the upper 10 cm of the soil column, while the natural soil retained 50% in the upper 25 cm. In addition, the natural soil retained 60% of the Ca applied in solution. The simulation model produced good results for Na but only fair prediction of Ca and Mg. A discussion of the experimental conclusions' applicability to field conditions, the difficulties of the salt leaching model, and recommendations for further research is given.

From the Proceedings of the 1980 Meetings of the Arizona Section - American Water Resources Assn. and the Hydrology Section - Arizona - Nevada Academy of Science - April 11-12, 1980, Las Vegas, Nevada / Demands for electric power generation are rapidly increasing water -supply requirements in northeastern Arizona, where groundwater pumpage is expected to escalate sixfold during the next ten years. In a study undertaken to determine the feasibility of using satellite imagery as a tool in exploring for new sources of groundwater, lineaments detected on Landsat images of two study sites in Arizona were mapped. Literature related to well data in the two study areas was researched and the data were plotted. The lineaments then were correlated with the well data by means of a well- centered grid model. Correlations developed between lineament density and water well data in the two study sites support the hypothesis that a relationship exists between regional geologic structure and the presence of groundwater, and indicate that Landsat images can be used as a tool in delineating structural features.

From the Proceedings of the 1980 Meetings of the Arizona Section - American Water Resources Assn. and the Hydrology Section - Arizona - Nevada Academy of Science - April 11-12, 1980, Las Vegas, Nevada

From the Proceedings of the 1980 Meetings of the Arizona Section - American Water Resources Assn. and the Hydrology Section - Arizona - Nevada Academy of Science - April 11-12, 1980, Las Vegas, Nevada

From the Proceedings of the 1980 Meetings of the Arizona Section - American Water Resources Assn. and the Hydrology Section - Arizona - Nevada Academy of Science - April 11-12, 1980, Las Vegas, Nevada