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1	Water Quality of Streamflow from Forested Watersheds on Sedimentary Soils Gregory, Paul W., Ffolliott, Peter F. 01 May 1976 (has links) From the Proceedings of the 1976 Meetings of the Arizona Section - American Water Resources Assn. and the Hydrology Section - Arizona Academy of Science - April 29-May 1, 1976, Tucson, Arizona / To provide quantitative baseline information on water quality of streamflow from ponderosa pine watersheds on sedimentary soils, water samples were collected at the mouths of four watersheds at time of surface runoff and during extreme or unusual hydrological events. In each sample, calcium (Ca++), magnesium (Mg++) and sodium (Na+) were determined by using atomic absorption spectrophotometry; carbonate (CO=3) and bicarbonate (HCO-3) were measured by titrating with standard acid; fluoride (F-), sulfate (SO=4), 3 nitrate (NO-3), and chloride (Cl-) were determined by colorimetric methods using an Autoanalyzer; hydrogen ion concentration (pH) was measured by using a glass electrode; and suspended sediment concentrations were determined by filtration. The data obtained were compared with EPA water quality standards for aquatic life, irrigation, and public water supply. Although the EPA levels of acceptability have not been established for many of the chemical and physical water constituents, the parameters determined in this study, in general, fall within the EPA prescribed limits. Hydrology -- Arizona. Water resources development -- Arizona. Hydrology -- Southwestern states. Water quality Sedimentary soils Ponderosa pine forests Streamflow Arizona Forest watersheds Heber Watershed (Ariz)
2	SEDCON: A Model of Nutrient and Heavy Metal Losses in Suspended Sediment Gabbert, William A., Ffolliott, Peter F., Rasmussen, William O. 24 April 1982 (has links) From the Proceedings of the 1982 Meetings of the Arizona Section - American Water Resources Assn. and the Hydrology Section - Arizona - Nevada Academy of Science - April 24,1982, Tempe, Arizona / A prototypical computer simulation model has been developed to aid watershed managers in estimating impacts of alternative land management practices on nutrient and heavy metal losses due to transported sediment on forested watersheds of the southwestern United States. The model, called SEDCON, allows users at remote locations with modest computer terminal equipment and commonly available data to obtain reliable estimates of nutrient and heavy metal concentrations in suspended sediment originating on uniformly-stocked, forested watersheds in the Southwest. SEDCON has been structured in an interactive mode to facilitate its use by persons not familiar with computer operations. Written in FORTRAN IV computer language, the model requires approximately 5000 words of core. SEDCON is operative on a DEC-10 computer at the University of Arizona. Hydrology -- Arizona. Water resources development -- Arizona. Hydrology -- Southwestern states. Nutrients Mineral center Water resources management Watershed management Computer models Heavy metals Sediment transport Water quality Hardness Model studies Land management Simulation analysis Forest watersheds SEDCON model Southwest U.S

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Water Quality of Streamflow from Forested Watersheds on Sedimentary Soils

SEDCON: A Model of Nutrient and Heavy Metal Losses in Suspended Sediment