00000nam 2200000zi 4500 9.872848 CaOODSP 20241203113648 m o d f cr ||||||||||| 190513s1988 oncbd #ob f000 0 eng d CaOODSP eng rda CaOODSP eng fre nl----- En13-5/88-44E-PDF Barica, J., author. Recovery of the Laurentian Great Lakes, 1970-1985 : eutrophication aspects / J.M. Barica. Burlington, Ontario, Canada : National Water Research Institute, Lakes Research Branch, Canada Centre for Inland Waters, Environment Canada, [1988] 1 online resource (20 unnumbered pages) : maps, graphs. text txt rdacontent computer c rdamedia online resource cr rdacarrier NWRI contribution ; 88-44 Title from cover. Digitized edition from print [produced by Environment and Climate Change Canada]. Includes bibliographical references. "Eutrophication of the Laurentian Great Lakes accelerated exponentially during the first half of this century. Canada and the United States recognized this fact and signed the 1972 Great Lakes Water Quality Agreement. Since then, coordinated activities have resulted in a massive cleanup, unprecedented in history. Major wastewater treatment programs have been implemented. With expenditures totaling over eight billion dollars, industrial controls and phosphate limitations in detergents produced a reduction and even a reversal of the eutrophication process. The long-term trend of total phosphorus concentrations have been downward since the mid 70's when legislation on phosphorus reduction was put into effect. Nuisance algal blooms are no longer a common occurrence and Cladophora infestations of nearshore areas are declining"--Abstract. Includes abstract and management perspective in English and French. gccst Water quality gccst Lakes gccst Environmental management Canada. Environment Canada. National Water Research Institute (Canada). Lakes Research Branch. Canada Centre for Inland Waters. NWRI contribution ; 88-44. (CaOODSP)9.844121 PDF 1.84 MB https://publications.gc.ca/collections/collection_2019/eccc/en13-5/En13-5-88-44-eng.pdf