Author:
Publisher:
ISBN:
Category : Stream ecology
Languages : en
Pages : 62
Book Description
Effects of Urbanization on Stream Ecosystems in the Willamette River Basin and Surrounding Area, Oregon and Washington
Author:
Publisher:
ISBN:
Category : Stream ecology
Languages : en
Pages : 62
Book Description
Publisher:
ISBN:
Category : Stream ecology
Languages : en
Pages : 62
Book Description
Effects of Urbanization on Stream Ecosystems in the Williamette River Basin and Surrounding Area, Oregon and Washington
Author:
Publisher:
ISBN:
Category : Stream ecology
Languages : en
Pages : 62
Book Description
Publisher:
ISBN:
Category : Stream ecology
Languages : en
Pages : 62
Book Description
Willamette River Basin
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 58
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 58
Book Description
Channel Improvements, Columbia and Lower Willamette River Federal Navigation Channel, (OR,WA)
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 498
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 498
Book Description
Willamette River Floodplain Restoration, Oregon
Author: United States. Office of the Assistant Secretary of the Army (Civil Works)
Publisher:
ISBN:
Category : Environmental impact analysis
Languages : en
Pages : 1308
Book Description
Publisher:
ISBN:
Category : Environmental impact analysis
Languages : en
Pages : 1308
Book Description
Project Development and Data Programs for Assessing the Quality of the Willamette River, Oregon
Author: David A. Rickert
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 44
Book Description
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 44
Book Description
Environmental Setting of the Willamette Basin, Oregon
Author: Mark A. Uhrich
Publisher:
ISBN:
Category : Sandy River Watershed (Or.)
Languages : en
Pages : 34
Book Description
Publisher:
ISBN:
Category : Sandy River Watershed (Or.)
Languages : en
Pages : 34
Book Description
Willamette River Basin, Oregon
Author:
Publisher:
ISBN:
Category : Hydroelectric power plants
Languages : en
Pages : 20
Book Description
Publisher:
ISBN:
Category : Hydroelectric power plants
Languages : en
Pages : 20
Book Description
Restoring the Willamette River
Author:
Publisher:
ISBN:
Category : Water quality
Languages : en
Pages : 180
Book Description
Publisher:
ISBN:
Category : Water quality
Languages : en
Pages : 180
Book Description
Reservoir-system Model for the Willamette River Basin, Oregon
Author: James O. Shearman
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 32
Book Description
For nearly half a century the Willamette River in Oregon experienced severe dissolved-oxygen problems related to large loads of organically rich waste waters from industries and municipalities. Since the mid-1950 's dissolved oxygen quality has gradually improved owing to low-flow augmentation, the achievement of basinwide secondary treatment, and the use of other waste-management practices. As a result, summer dissolved-oxygen levels have increased, salmon runs have returned, and the overall effort is widely regarded as a singular water-quality success. To document the improved dissolved-oxygen regimen, the U.S. Geological Survey conducted intensive studies of the Willamette during the summer low-flow seasons of 1973 and 1974. During each summer the mean daily dissolved-oxygen levels were found to be higher than 5 milligrams per liter throughout the river. Because of the basinwide secondary treatment, carbonaceous deoxygenation rates were low. In addition, almost half of the biochemical oxygen demand entering the Willamette was from diffuse (nonpoint) sources rather than outfalls. These results indicated that point-source biochemical oxygen demand was no longer the primary cause of dissolved-oxygen depletion. Instead, the major causes of deoxygenation were nitrification in a shallow ' surface active ' reach below Salem and an anomalous oxygen demand (believed to be primarily of benthal origin) in Portland Harbor.
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 32
Book Description
For nearly half a century the Willamette River in Oregon experienced severe dissolved-oxygen problems related to large loads of organically rich waste waters from industries and municipalities. Since the mid-1950 's dissolved oxygen quality has gradually improved owing to low-flow augmentation, the achievement of basinwide secondary treatment, and the use of other waste-management practices. As a result, summer dissolved-oxygen levels have increased, salmon runs have returned, and the overall effort is widely regarded as a singular water-quality success. To document the improved dissolved-oxygen regimen, the U.S. Geological Survey conducted intensive studies of the Willamette during the summer low-flow seasons of 1973 and 1974. During each summer the mean daily dissolved-oxygen levels were found to be higher than 5 milligrams per liter throughout the river. Because of the basinwide secondary treatment, carbonaceous deoxygenation rates were low. In addition, almost half of the biochemical oxygen demand entering the Willamette was from diffuse (nonpoint) sources rather than outfalls. These results indicated that point-source biochemical oxygen demand was no longer the primary cause of dissolved-oxygen depletion. Instead, the major causes of deoxygenation were nitrification in a shallow ' surface active ' reach below Salem and an anomalous oxygen demand (believed to be primarily of benthal origin) in Portland Harbor.