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WWRC 86-05y
Flushing Flow Research


The effectiveness of flushing flow recommendations for the North Fork of the Little Snake River was assessed in response to sediment deposition which occurred in 1984 as a result of construction activity in the watershed. Results indicate that three spring runoff flushes meeting or exceeding the magnitude and duration of the recommended flushing flow were somewhat successful in reducing the quantity of deposited material. Quality of deposited material, in terms of trout habitat, was very low but showed an improving trend in response to the runoff hydrograph in stream areas most severely effected. Methodology for quantitatively assessing the effectiveness of flushing flows is presented as well as mitigative recommendations for 1986.

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