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<br />iii <br /> <br /> <br />N <br />o <br />W <br />Ul <br /> <br />ABSTRACT <br /> <br />Field and laboratory measurements of process rates for runoff and <br />salt movement were used to develop and calibrate a hydrosalinity model <br />of outflows from the Price River Basin at Woodside, Utah. The field <br />measurements were specifically used to formulate a model for esti- <br />mating surface flow (both overland and from small ephemeral channels) <br />in the Coal Creek Basin on the valley floor of the Price River Basin. <br />The basin simulation assessment model (BSAM) was used to combine <br />local flows and model total outflow from the Price River. <br /> <br />The results must be regarded as a first generation model that, <br />while giving ostensibly reasonable results, needs much additional <br />refinement and validation by collecting additional field data. As to <br />field data, observed salt loading rates reached 518 pounds per square <br />mile daily, groundwater inflow declined steadily throughout the summer <br />but maintained constant salt concentrations, channel efflorescence <br />varied more than 100 fold with the largest concentrations occurring in <br />saturated bed material, and turbulent mixing and cyclic drying <br />added to salt dissolution rates. <br /> <br />Extrapolation of tbe results with the Coal Creek model showed <br />only a very small percentage of the salt loading from the valley floor <br />to originate from natural lands. BSAM showed average annual salt <br />leaving the Basin at Woodside to be 190,000 tons, 114,000 coming <br />from the mountain area and 76,000 from the valley floor. Of the <br />valley floor contribution, only 3,500 tons are produced by surface <br />runoff from nonirrigated areas. <br /> <br />Topics to be emphasized in further model development include <br />salt contribution from percolation snowmelt on natural lands, ground- <br />water movement, the formation and dissolution of efflorescence, and <br />salt-sediment transport by the sharp hydrographs on small ephemeral <br />streams. <br />