Quantity and Quality of Ground-Water Inflow to the San Joaquin River, California

摘要

Concern over high concentrations of dissolved solids and trace elements in the San Joaquin River has focused attention on ground water as a potentially significant source of contamination. The report describes the results of a study and presents descriptive analysis of the hydrogeologic characteristics of the ground-water-flow system adjacent to the river, quantitative analysis of ground-water-flow into the river using two-dimensional ground-water-flow models developed for three cross sections of the flow system, quantitative analysis of ground-water flow into the river by a water-balance approach using measured surface-water flows, descriptive analysis of the chemistry and iso-topic composition of ground water adjacent to the river with implications of the age, origin, and quality of ground water in different parts of the flow system, and comparative evaluation of independent assessments of the quantity and quality of ground-water inflow to the San Joaquin River.