In article the influence of loads of biogenic substances (total nitrogen and total phosphorus) inflowing with water of Wisła river on eutrophication process of water Goczałkowice reservoir was presented. The research was conducted in years 2004-2006 and 2010-2011, in vegetative seasons. The loading total phosphorus of Goczałkowice reservoir was calculated and the acceptable load and dangerous load of total phosphorus (according to Vollenveider 1976) have both been calculated. The enumerated value of loading of total phosphorus load was compared to the value of acceptable loads and dangerous loads. Moreover, biomass of phytoplankton (given in wet mass) was calculated and a species composition of phytoplankton was determined. The analyses declared that the loads of total phosphorus, which were contributed with water of Wisła river were lesser in years 2010-2011 (averagely 0,147 g P•m-2•year-1) than loads, which flowed in years 2004-2006 (0,681 g P•m-2•year-1). The first exchanged loads had exceeded only values of acceptable loads. It can indicate to the improvement of the conditions in the catchment area. In spite of the lesser inflow of the loads, it was ascertained that water of the reservoir still points out eutrophic character. The high concentrations of total phosphorus (averagely 0,05 mg ...
In order to improve the quality of retentioned waters in dam reservoirs, the pre-dam reservoirs are built, that are localized above the main one. They aim at keeping contaminants transported by a river. The example of such solution can be the largest reservoir in Lublin region - "Nielisz". Reservoir consists of two parts divided with dam. The main reservoir (water surface area 709 ha at NPP, mean depth 2.8 m, and total capacity 18.30 mln m3) is localized in river Wieprz valley. Its catchment area is 1236.2 km2. The pre-dam reservoir of 179 ha area at NPP, mean depth of 0.7 m, and total capacity of 1.18 mln m3, is situated in river Por valley. The damming section is situated on 1.685 km of its course, while the catchment area amounts to 590.3 km2.Present research aims at presenting the analysis upon the influence of pre-dam reservoir on quality of waters supplying the main reservoir. Water samples were collected with quarter increments at the inflow and outflow from the reservoir. Analysis of results from here conducted survey univocally indicates that analyzed pre-dam reservoir contributes to significant improvement of water flowing into the main one. The largest reduction of pollutant concentrations in ...
