Postprint version. Published in Journal of Hydrology, Volume 233, Issue 1-4, June 12, 2000, pages 102-120.
Copyright © 2000 Elsevier.
NOTE: At the time of publication, the author C.G. Surfleet was not yet affiliated with Cal Poly.
The definitive version is available at http://dx.doi.org/10.1016/S0022-1694(00)00231-6.
The effects of clearcut silviculture (road building, clearfelling, cable logging, and site preparation) were evaluated using long-term peakflow records for three small watersheds (60–101 ha) and six large basins (62–640 km2) in the western Cascades of Oregon, USA. After a calibration period, two of the small watersheds were treated while the third remained untreated (control). Analysis indicated that peakflow increases following treatments were dependent upon peakflow magnitude. Peakflow increases averaged approximately 13–16% after treatment for 1-yr recurrence interval events, and 6–9% for 5-yr recurrence interval events. For the six large basins, multiple linear regression analyses of peakflows relative to: (1) peakflow magnitude; and (2) difference in percent area harvested provided mixed results. While significant (pr2) due to harvesting was generally small (1–7%).