What is the relationship between stream flow and EC, and between stream flow and SAR?

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What is the relationship between stream flow and EC, and between stream flow and SAR?

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Generally, salinity decreases as stream flow increases and increases with decreasing stream flow. The same is true for SAR. In many high plains streams, salinity may rise with the first flush of runoff water due to bank flushing, which washes salt off the soil adjacent to streams. Stream flow generally decreases after spring snow melt and runoff from higher elevations ends. When the river goes through rising and falling stages due to rain (especially thunderstorms), the EC is usually lower when the river level is falling, rather than rising. For a good report on this topic read the USGS Publication “U.S. Geological Survey Monitoring of Powder River Basin Stream Water Quantity and Quality.” The EC of stream water may also increase during periods of drought and during the irrigation season from addition of irrigation return flow. The SAR of a stream is dependent on the amount of sodium in the stream relative to the amount of calcium and magnesium. If sodium is a significant component of

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