Sommerfield et al. (2002) discuss the frequency and magnitude of floods and associated sedimentation rates for north-coastal California. They emphasize a significant increase in flood frequency during the second half of the twentieth century relative to the first half. They attribute this variability to variations in the strength and position of Pacific pressure cells, trajectories of westerly rainstorm tracks over the western United States, and related atmospheric anomalies.

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Their quantification of the increase of flood frequency is primarily based on measured discharges from the Eel River at Scotia, California (USGS Station 11477000) during the period 1911–1999, with the maximum discharge...

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