Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Watershed and point source enrichment and lake trophic state index /
Author Neel, Joe K.
CORP Author North Dakota Univ., Grand Forks. Dept. of Biology.;Corvallis Environmental Research Lab., OR.
Publisher Corvallis Environmental Research Laboratory, Office of Research and Development, U.S. Environmental Protection Agency ; For sale by the National Technical Information Service,
Year Published 1979
Report Number EPA-600/3-79-046; EPA-R-800490
Stock Number PB-299 197
OCLC Number 05346564
Subjects Watersheds. ; Lakes. ; Water--Pollution.
Additional Subjects Water pollution ; Pelican River ; Primary biological productivity ; Nutrients ; Watersheds ; Phosphorus ; Concentration(Composition) ; Algae ; Vegetation ; Aquatic plants ; Surface waters ; Ground water ; Seepage ; Oxygen ; Hydrogen sulfide ; Minnesota ; Eutrophication ; Trophic level ; Point sources ; Water quality data
Internet Access
Description Access URL
Library Call Number Additional Info Location Last
EHAM  TD224.M6N44 1979 Region 1 Library/Boston,MA 04/29/2016
EJBD ARCHIVE EPA 600-3-79-046 Headquarters Library/Washington,DC 04/10/2014
EJBD  EPA 600-3-79-046 Headquarters Library/Washington,DC 03/22/2016
ELBD  EPA 600-3-79-046 AWBERC Library/Cincinnati,OH 11/15/2016
ESAD  EPA 600-3-79-046 Region 10 Library/Seattle,WA 03/23/2010
ESBD  EPA-600-3-79-046 CPHEA/PESD Library/Corvallis,OR 09/05/2017
NTIS  PB-299 197 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 01/01/1988
Collation ix, 102 pages : illustrations.
Water in the permeable soils of the upper Pelican River watershed, Minnesota, requires slightly more than a year to move generally out of the phreatic zone into surface channels and basins. Its nutrient content seems mainly responsible for the load borne in surface waters above entrance of a wastewater effluent, and groundwater changes have been followed a year later by similar ones in surface water. In 1975 P load from non-point sources markedly exceeded that from the wastewater effluent. Nutrients in groundwater are assumed to result from soil surface application, but only quantities supplied by precipitation have been measured. The most noxious conditions in surface waters have been occasioned by heterocystous blue-green phytoplankters, but the greatest plant mass has been produced by rooted and attached vegetation. Groundwater seepage into these lakes contributed more nutrients than precipitation, but the latter supplied what may be significant amounts to watershed soils. A trophic state index based on change in Mg/Ca quotient relative to water residence time has reliably depicted relative total productivity levels in 6 lakes or ponds, and its general applicability, at least to natural lakes, now appears likely.
Includes bibliographical references (pages 70-71).