Determine the total dissolved solids concentration of the Columbia River in mg/L, just upstream of the confluence of the two rivers.
The Columbia River is the 10th largest river in the United States. The Snake River is the largest tributary of the Columbia River. The Snake River discharges 47,680 cfs of water into the Columbia on average each year. The total dissolved solids, a nonreacting substance, in Snake River averages approximately 200 mg/L. Just downstream of the discharge from the Snake River, the average flow rate of the combined rivers is 169,800 cfs. The total dissolved solids, a non-reacting substance, in the combined rivers averages 80 mg/L.
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