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Forest practices and stream flow in western Oregon.Author(s): R. Dennis. Harr
Source: Gen. Tech. Rep. PNW-GTR-049. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station. 18 p
Publication Series: General Technical Report (GTR)
Station: Pacific Northwest Research Station
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DescriptionForest management activities, including roadbuilding, clearcut logging, and broadcast burning, can change certain portions of the forest hydrologic cycle. Watershed studies and other hydrologic research in the Coast and western Cascade Ranges of Oregon have shown that these changes may increase annual water yield up to 62 centimeters, double minimum flows in summer, and increase fall peak flows up to 200 percent and small winter peak flows up to 45 percent in small watersheds. Changes in streamflow resulting from clearcut logging had little effect on either onsite damage to stream channels and hydraulic structures or downstream flooding when yarding caused only light disturbance of soil. By increasing the size of larger peak flows, roadbuilding and soil compaction may cause onsite damage in small, headwater basins. Increases in annual yield and minimum flows may be substantial on small watersheds that are clearcut; under sustained yield forest management, such increases are masked in large, parent watersheds by unaltered streamflow from unlogged watersheds.
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CitationHarr, R. Dennis. 1976. Forest practices and stream flow in western Oregon. Gen. Tech. Rep. PNW-GTR-049. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station. 18 p
KeywordsWatershed management, streamflow, forest logging, road building (temporary)
- Hydrology of small forest streams in western Oregon.
- Forest harvesting and water: the Lake States experience
- The summer flow and water yield response to timber harvest
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