Water Stewardship Information Sources

Citation Moore, RD. and Wondzell, S.M. (2005), PHYSICAL HYDROLOGY AND THE EFFECTS OF FOREST HARVESTING IN THE PACIFIC NORTHWEST: A REVIEW. JAWRA Journal of the American Water Resources Association, 41: 763–784. doi: 10.1111/j.1752-1688.2005.tb03770.x
Organization UBC
URL http://onlinelibrary.wiley.com/doi/10.1111/j.1752-1688.2005.tb03770.x/abstract
Abstract/Description or Keywords streamflow;forest harvesting;headwater;peak flow;low flow;water yield;small catchment;Pacific Northwest
The Pacific Northwest encompasses a range of hydrologic regimes that can be broadly characterized as either coastal (where rain and rain on snow are dominant) or interior (where snowmelt is dominant). Forest harvesting generally increases the fraction of precipitation that is available to become streamflow, increases rates of snowmelt, and modifies the runoff pathways by which water flows to the stream channel. Harvesting may potentially decrease the magnitude of hyporheic exchange flow through increases in fine sediment and clogging of bed materials and through changes in channel morphology, although the ecological consequences of these changes are unclear. In small headwater catchments, forest harvesting generally increases annual runoff and peak flows and reduces the severity of low flows, but exceptions have been observed for each effect. Low flows appear to be more sensitive to transpiration from vegetation in the riparian zone than in the rest of the catchment. Although it appears that harvesting increased only the more frequent, geomorphically benign peak flows in several studies, in others the treatment effect increased with return period. Recovery to pre-harvest conditions appeared to occur within about 10 to 20 years in some coastal catchments but may take many decades in mountainous, snow dominated catchments.
Information Type article
Regional Watershed Province
Sub-watershed if known
Aquifer #
Project status complete
Contact Name Dan Moore
Contact Email [email protected]