“…In the Pacific Northwest, the absence of mature timber appears to increase not only the frequency of debris flow activity (Schwab, 1983;Rood, 1984;Jakob, 2000;Guthrie, 2002Guthrie, , 2005Guthrie and Brown, 2008), but also the magnitude and travel distance of individual events (Robison et al, 1999;Bunn and Montgomery, 2000;Lancaster et al, 2003;May and Gresswell, 2003;Miller and Burnett, 2008;among others). Landslide research from the Coast Range of Oregon demonstrates several ways in which forests can influence debris flow runout: Debris flows have lower mean runout lengths and shorter depositional zones in mature forests (Robison, et al, 1999;May and Gresswell, 2003;Miller and Burnett, 2008), while landslides in younger stands (< 9 years) have increased volumes of erosion compared to regenerating stands (9-100 years) (Robison et al, 1999).…”