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Estimation of the status and classification of a body of water
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acid aeration aerobic algal blooms aluminium sulphate aquatic Arendsee bacteria biocoenosis biological productivity biomass blue-green algae body of water carbon catchment area chemical classification coagulation concentration criteria crops deep-level abstraction deep-level aeration deep-level water denitrification desludging destratification dissolved oxygen dredging drinking-water reservoirs East Germany ecological ecosystem effect elimination epilimnion eutrophication factors fertilizer filter filtration fish fishery flow groundwater growth hydrogen sulphide hypolimnic hypolimnion increased inflow input interception basins irrigation Klapper layer macrophytes means measures method n.d n.d natural waters nitrate nitrogen nutrient occur odour oligotrophic operation organic matter orthophosphate oxidation oxygen budget phosphate phosphorus phytoplankton pipe plankton plant pollution polytrophic ponds possible primary productivity pump reduction rehabilitation removal result retention Secchi depth sediment sewage treatment sludge species static bodies storage stratified substances sulphur summer stagnation supply surface Table temperature toxic trophic level turnover water bodies water quality zone zooplankton