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    Author(s): J. Eli Asarian; Jeffrey D. Walker
    Date: 2017
    Source: Gen. Tech. Rep. PSW-GTR-258. Albany, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Research Station: 215
    Publication Series: General Technical Report (GTR)
    Station: Pacific Southwest Research Station
    PDF: Download Publication  (38.0 KB)

    Description

    Using streamflow data from the U.S. Geological Survey, we assessed long-term (1953-2012) trends in streamflow on California’s North Coast including many sites in the redwood region. The study area spans from the Smith River to the Mattole River and includes the Eel and Klamath-Trinity basins. Antecedent Precipitation Index (API) is a time-weighted summary of precipitation which provides high weight to recent precipitation and low weight to precipitation that occurred many months ago. We used a regression model of the relationship between API and streamflow to calculate "precipitation-adjusted streamflow", which statistically reduced the year-to-year fluctuations caused by variable precipitation and allowed evaluation of the underlying streamflow trend.

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    Citation

    Asarian, J. Eli; Walker, Jeffrey D. 2017. Long-term streamflow trends on California’s north coast. In: Standiford, Richard B.; Valachovic, Yana, tech cords. Coast redwood science symposium—2016: Past successes and future direction. Proceedings of a workshop. Gen. Tech. Rep. PSW-GTR-258. Albany, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Research Station: 215.

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