Record Display for the EPA National Library Catalog


Main Title Nutrient diversion : resulting lake trophic state and phosphorus dynamics /
Author Welch, E. B.
CORP Author Washington Univ., Seattle.;Corvallis Environmental Research Lab., Oreg.
Publisher Environmental Protection Agency, Office of Research and Development, Corvallis Environmental Research Laboratory ;
Year Published 1977
Report Number EPA-600/3-77-003; EPA-R-800512
Stock Number PB-262 645
OCLC Number 02759506
ISBN pbk.
Subjects Algae--Washington (State) ; Eutrophication--Washington (State) ; Lakes--Washington (State) ; Limnology--Washington (State)
Additional Subjects Lake Sammamish ; Limnology ; Phosphorus ; Water pollution ; Algae ; Chlorophylls ; Nutrients ; Sediments ; Ions ; Concentration(Composition) ; Tables(Data) ; Primary biological productivity ; Graphs(Charts) ; Washington(State) ; Eutrophication ; Trophic level ; Organic loading
Internet Access
Description Access URL
Library Call Number Additional Info Location Last
EJBD ARCHIVE EPA 600-3-77-003 Headquarters Library/Washington,DC 03/04/2014
EJBD  EPA 600-3-77-003 c.1 Headquarters Library/Washington,DC 05/23/2014
ESAD  EPA 600-3-77-003 Region 10 Library/Seattle,WA 06/10/2005
ESBD  EPA 600/3-77/003 CPHEA/PESD Library/Corvallis,OR 01/31/1997
NTIS  PB-262 645 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation x, 91 pages : illustrations, graphs, map ; 28 cm
Lake Sammamish, Washington, was studied during 1970-75 to determine its response to wastewater diversion in 1968. The results were compared with a pre-diversion study in 1964-65. Diversion reduced the phosphorus loading by about one-third (from 1.02 to 0.67 g P/sq m. yr and about 119 to 68 micro g/l in the inflow). Winter total phosphorus remained constant and no trend was shown in chlorophyll a in spring-summer. Water transparency remained the same. Paleolimnological evidence suggests that the lake has been near its present mesotrophic state for about 100 years. This stability is thought to be due to the constancy of the water phosphorus concentration which is in turn controlled by the anaerobic-aerobic release and sedimentation of iron and its complexes.
Prepared by University of Washington, Seattle, Wash., under research grant R 800512. Includes bibliographical references (pages 88-90).