Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Watershed Analysis Relating to Eutrophication of Lake Michigan.
Author Stephenso, Marvin E. ; Waybran, James R. ;
CORP Author Michigan State Univ., East Lansing. Inst. of Water Research.
Year Published 1971
Report Number TR-11; DI-14-01-0001-1842; OWRR-A-023-MICH; 13808,; A-023-MICH(1)
Stock Number PB-203 425
Additional Subjects ( Water pollution ; Nutrients) ; ( Great Lakes ; Water pollution) ; ( River basins ; Nutrients) ; Nitrogen ; Phosphorus ; Nitrates ; Phosphates ; Sewage treatment ; Agricultural wastes ; Surface water runoff ; Urban areas ; Rural areas ; Water quality ; Sewage ; Aquatic biology ; Fertilizers ; Lake Michigan ; Eutrophication ; Grand River Basin
Library Call Number Additional Info Location Last
NTIS  PB-203 425 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 06/23/1988
Collation 128p
The influence of municipal and agricultural practices on stream water quality in the Grand River Basin was examined in terms of the resulting phosphorus and nitrogen inputs to Lake Michigan. Phosphorus and nitrogen concentrations in the Grand River watershed indicated that nitrate-nitrogen fluctuated significantly with changes in temperature and photoperiod, while total phosphorus concentrations were not influenced by these indexes of biological activity. A study of nutrient concentrations in runoff from watersheds of predominantly urban, natural, or agricultural land usages indicated significant differences: The natural watershed runoff contained less nitrate-nitrogen than did runoff from either the urbanized or agricultural watersheds; Urbanized land runoff contained far greater concentrations of phosphorus than did runoff from either natural or agricultural watersheds; and Natural and agricultural land runoff did not contain significantly different concentrations of total phosphorus. General observations of nutrient fluctuations in the Grand River system indicated evidence of possible nitrogen-limitation during the period of surveillance. (Author)