Formulation and Use of Practical Models for River-quality Assessment PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download Formulation and Use of Practical Models for River-quality Assessment PDF full book. Access full book title Formulation and Use of Practical Models for River-quality Assessment by Walter G. Hines. Download full books in PDF and EPUB format.
Author: Walter G. Hines
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 24
Get Book
Book Description
Author: Walter G. Hines
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 24
Get Book
Book Description
Author: David A. Rickert
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 68
Get Book
Book Description
Author: David A. Rickert
Publisher:
ISBN:
Category : Water quality management
Languages : en
Pages : 32
Get Book
Book Description
Author: David A. Rickert
Publisher:
ISBN:
Category : Erosion
Languages : en
Pages : 518
Get Book
Book Description
Author:
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 532
Get Book
Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 666
Get Book
Book Description
Author:
Publisher:
ISBN:
Category : Water
Languages : en
Pages : 710
Get Book
Book Description
Author: David A. Rickert
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 44
Get Book
Book Description
Author: James O. Shearman
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 32
Get Book
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.
Author: Geological Survey (U.S.)
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 92
Get Book
Book Description
