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Lake Kortowskie is restored by the hypolimnetic withdrawal method: rich in nutrients near-bottom waters are removed by a pipeline directly to the outflow instead of the natural outflow of surface waters. It has been found out that the amount of water discharged through the pipeline and therefore the amount of removed phosphorus depends on the surface inflow. The water balance of the lake in summer...
In a mosaic landscape moderately affected by agriculture and tourism, such as found in the Masurian Lakeland (north-eastern Poland) external input of nutrients (TP, TN, NNO3) and their retention were compared in a cascade of shallow in-river lakes, between several years of different weather conditions. The average and maximum air temperature in the summer and winter months and that of the freshet...
The aim of this research was estimation and comparison of denitrification rate in the Sulejów Reservoir using two methods: 1). the in situ chamber method – the denitrification rate was calculated from the total N2 flux out of the sediment, measured directly by gas chromatography and ranged from 0 to 677 μmoll N2 m-2 h-1. 2). occurrence of denitrifying bacteria – determined by means of the most probable...
Lowland rivers in industrial countries such as the UK are seriously impacted by phosphorus from a variety of sources. Point sources include numerous sewage-treatment works; diffuse sources include a full range of agricultural activities from fertiliser application to intensive poultry and stock rearing. The scientific consensus is that the concentration of phosphorus is an important measure of eutrophication...
The application of ecohydrology principles as part of Integrated Water Resources Management (IWRM) has the potential to enhance the resilience of a catchment to anthropogenic impacts. Linking this approach with an understanding of water users and social and economic conditions in a given region, provides a foundation for the development of system solutions. Improving the quality of the environment,...
This study introduced the spatial pattern of PCDD, PCDF and dl-PCB concentration in the sediments of Ethiopian small river-lake system. Among the analyzed samples the highest contamination was observed in the lake littoral (222.11 ng kg-1 d.w.). The lowest concentration was noted at the outflow from the lake (26.65 ng kg-1 d.w.). The WHO-TEQ concentrations showed decreasing trend along the river-lake...
The water hyacinth, Eichhorrnia crassipes, has been widely recognized as the worst aquatic weed the world over and of increasing importance in Africa, Ethiopia inclusive. The aim of the research was to highlight the devastating impact of the water hyacinth on aquatic life and human activities on Aba Samuel Dam and to underline prospects of its beneficial use. Delphi technique and on-site observations...
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