Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Manipulation of Reservoir Waters for Improved Quality and Fish Population Response.
Author Wirt, Thomas L. ; Duns, Russel C. ; Uttormar, Paul D. ; Hilsenhof, William ;
CORP Author Wisconsin Dept. of Natural Resources, Madison.
Year Published 1970
Report Number RR-62; DI-14-01-0001-1059; OWRR-B-013-WIS; 03307,; B-013-WIS(4)
Stock Number PB-196 662
Additional Subjects ( Reservoirs ; Water quality) ; ( Fishing grounds ; Reservoirs) ; ( Limnology ; Reservoirs) ; Reservoir engineering ; Food chains ; Water pollution ; Control ; Aquatic animals ; Aquatic plants ; Temperature ; Water ; Oxygen ; Aeration ; Wisconsin ; Ecology ; Plankton ; Eutrophication
Library Call Number Additional Info Location Last
NTIS  PB-196 662 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 06/23/1988
Collation 28p
Compressed air continuously mixed Cox Hollow Lake, an 8-year-old eutrophic reservoir, for 3 years. Winter D.O. levels were greatly improved. The elimination of severe thermal stratification in summer resulted in: (1) considerable warming of deep water, (2) disappearance of high chemical concentrations near the bottom and recurrence of D.O., (3) habitation of profundal muds by invertebrates. There were no lasting improvements in water clarity or in several fish population parameters by the end of the study, although there was an increase in fish harvest. Eutrophication prevention by continual bottom-water discharge was studied in newly formed Twin Valley Lake. The hypolimnion was anaerobic during the summer resulting in high chemical concentrations. Large amounts of N and P were released, exceeding the potential amount for an epilimnion discharge; however, eutrophication was soon exemplified in high plankton densities and overabundant rooted vegetation. By the second fall the fish population exhibited signs of developing into a lower quality fishery. In the downstream channel warmer water in winter and colder water in summer benefited the growth and survival of stocked brown trout. Although the stream environment was still unsettled after three years, it was improved greatly. (Author)