Record Display for the EPA National Library Catalog


Main Title Lake Phosphorus Loading Graphs: An Alternative.
Author Larsen, D. P. ; Mercier., H. T. ;
CORP Author Pacific Northwest Environmental Research Lab., Corvallis, Oreg.;National Environmental Research Center, Corvallis, Oreg.;National Environmental Research Center, Las Vegas, Nev.
Year Published 1975
Report Number Working Paper-174;
Stock Number PB-243 869
Additional Subjects Water pollution ; Lakes ; Surveys ; Inorganic phosphates ; Inorganic nitrates ; Bioassay ; Primary biological productivity ; Chemical properties ; Phosphorus ; Concentration(Chemistry) ; Water quality ; Drainage ; Nutrients ; Sources ; Tables(Data) ; Graphs(Charts) ; Eutrophication ; Water quality data ; Trophic level ; Oligotrophic lakes
Library Call Number Additional Info Location Last
NTIS  PB-243 869 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 35p
As an alternative to loading graphs, a graph of mean influent phosphorus concentration versus phosphorus retention capacity is proposed to express the relationship between phosphorus supply and hydraulic flow to, and resultant trophic state of, lakes. Lines of constant lake phosphorus concentration drawn on the proposed graph delineate predicated trophic states and changes caused by altering influent phosphorus concentrations and/or lake phosphorus retention capacity. The graph, derived from the steady state solution of a phosphorus mass balance model, expresses lake mean phosphorus concentration as a function of mean influent phosphorus concentration and phosphorus retention capacity. Because the mean influent phosphorus concentration is a potential lake concentration reduced by the lake phosphorus retention capacity, a determination of the latter is critical for predicting lake phosphorus concentrations several empirical expressions are developed for oligtrophic lakes relating phosphorus retention capacity to areal hydraulic load or hydraulic washout coefficient. These expressions can be used to predict average lake phosphorus concentrations from mean influent concentrations.