Record Display for the EPA National Library Catalog


Main Title Defining Regional Populations of Lakes for the Assessment of Surface Water Quality.
Author Johnson, C. B. ; Sullivan, T. J. ; Blick, D. J. ;
CORP Author NSI Technology Services Corp., Corvallis, OR.;Corvallis Environmental Research Lab., OR.
Publisher c1989
Year Published 1989
Report Number EPA-68-C8-0006; EPA/600/J-89/137;
Stock Number PB90-125683
Additional Subjects Water chemistry ; Lakes ; Water pollution ; Topographic maps ; Surveys ; Populations ; Cartography ; Area ; Size determination ; Surface waters ; Assessments ;
Library Call Number Additional Info Location Last
NTIS  PB90-125683 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 10p
Topographic maps are commonly used to define populations of lakes in regional surveys of surface water quality. To illustrate the effect of diferent maps on that process, the authors compared the lakes represented on the 1:250,000 scale maps used for the Northeast Region of the Eastern Lake Survey - Phase I(ELS-1) to the lakes on the sample of large-scale maps. Lake areas at or near the lower limit of representation delimited 'smallest-lake' values for the compared 1:250,000-scale maps. Lake representation is influenced by cartographic limitations such as map scale, age, and complexity as well as the inherent variability of waterbodies. The total number of lakes on large-scale maps increased markedly as lake area decreased. Approximately 15,700 of the estimated 29,000 lakes in the EPA's Northeast Region were 1 to 4 ha in area.