Algal conditions and the potential for future algal problems in the Willamette River, Oregon / by David A. Rickert [and four others].

Format:

Book

Government document

Author/Creator:

Rickert, David A., 1940- author.

Contributor:

Geological Survey (U.S.), issuing body.

Series:

Geological Survey circular ; 715-G.

Geological Survey circular ; 715-G

River-quality assessment of the Willamette River Basin, Oregon

Language:

English

Subjects (All):

Eutrophication--Oregon--Willamette River.

Eutrophication.

Freshwater algae--Oregon--Willamette River.

Freshwater algae.

Water quality--Oregon--Willamette River.

Water quality.

Willamette River (Or.).

Oregon--Willamette River.

Genre:

Online resources.

Physical Description:

1 online resource (vi, G39 pages) : illustrations, maps.

Place of Publication:

[Reston, Virginia] : United States Department of the Interior, Geological Survey, 1977.

Summary:

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.

Notes:

Title from title screen (viewed July 1, 2015).

Also available online in PDF format from the U.S. Geological Survey Warehouse (http://pubs.er.usgs.gov/).

Includes bibliographical references (pages G35-G36).

Electronic reproduction. [Place of publication not identified]: HathiTrust Digital Library. 2020.

Other Format:

Print version: Rickert, David A., 1940-. Algal conditions and the potential for future algal problems in the Willamette River, Oregon

OCLC:

953209259

Access Restriction:

Use copy Restrictions unspecified