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11	Use of Stock Ponds for Hydrologic Research on Southwest Rangelands Simanton, J. R., Osborn, H. B. 05 May 1973 (has links) From the Proceedings of the 1973 Meetings of the Arizona Section - American Water Resources Assn. and the Hydrology Section - Arizona Academy of Science - May 4-5, 1973, Tucson, Arizona / 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. Hydrology -- Arizona. Water resources development -- Arizona. Hydrology -- Southwestern states. Stock water Hydrologic data Runoff Rainfall-runoff relationships Small watersheds Arizona Sedimentation On-site data collection Sediment yield Ponds Water holes Instrumentation Grazing Range grasses
12	Applicability of the Universal Soil Loss Equation to Semiarid Rangeland Conditions in the Southwest Renard, K. G., Simanton, J. R., Osborn, H. B. 20 April 1974 (has links) 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, Arizona / An erosion prediction method that has recently received wide attention in the United States is the universal soil loss equation which is given as: a=rklscp. Where a = estimated soil loss (tons/acre/year), r = a rainfall factor, k = a soil erodibility factor, l = a slope length factor, s = a slope gradient factor, c = a cropping-management factor, and p = an erosion control practice factor. Data collected on the walnut gulch experimental watershed in southeastern Arizona were used to estimate these factors for semiarid rangeland conditions. The equation was then tested with data from watersheds of 108 and 372 acres. The predicted value of annual sediment yield was 1.29 tons/acre/year as compared with an average 1.64 tons/acre/year for 4 years of data for the 108-acre watershed, and a sediment yield of 0.39 tons/acre/year was predicted for the 372-acre watershed as compared with the measured value of 0.52 tons/acre/year. Although good agreement was noted between predicted and actual sediment yield, additional work is needed before the equation can be applied to other areas of the southwest. Hydrology -- Arizona. Water resources development -- Arizona. Hydrology -- Southwestern states. Sediment yield Semiarid climates Erosion rates Soil erosion Estimating equations Arizona Sediment discharge Sedimentation rates Sediments Sediment load Ranges Range management Southwest U. S. Rainfall Surface runoff Rainfall-runoff relationships Slopes Erosion control Channel morphology Small watersheds Erosion Soil loss Sediment yield prediction Universal soil loss equation

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Use of Stock Ponds for Hydrologic Research on Southwest Rangelands

Applicability of the Universal Soil Loss Equation to Semiarid Rangeland Conditions in the Southwest