Abstract
The paper presents the water classification of four small retention reservoirs on the basis of selected physical and chemical indicators, such as: conductivity, pH level, dissolved oxygen, calcium hardness, general hardness and alkalinity. Three reservoirs (Ożanna, Kamionka and Cierpisz) are within the limits in terms of average values for the second class of water quality. Water in the Nowa Wieś reservoir does not qualify as second quality class of surface water. These reservoirs have had very irregular seasonal variations of water quality. Unambiguous correlations have not been established. Aggressive properties of water have been tested on the basis of Langelier (IL) or Ryznar (IR) indexes and calcium carbonate saturation [pHs]. Waters in the Ożanna and Nowa Wieś reservoirs do not have aggressive properties. Both the Kamionka and Cierpisz reservoirs are characterized by corrosive and leaching aggressiveness.
Highlights
Large retention reservoirs are designed to protect us from extreme phenomena such as periodic floods and droughts [1]
A detailed analysis of the obtained results of selected physico-chemical parameters in 20132014 showed that the quality of water taken from various points in these reservoirs may turn out to be slightly different in the end
In further analyses of the water quality, sampling points were not taken into account, and the results were referred to the entire reservoir (Table 2)
Summary
Large retention reservoirs are designed to protect us from extreme phenomena such as periodic floods and droughts [1]. -called small retention plays an important role in collecting water in small reservoirs by stopping or slowing down the runoff. Retention reservoirs are most often multipurpose facilities Their most important functions include water collection for municipal and agricultural purposes or flood protection. They are used for recreational purposes, hydropower and fishing [2, 3]. The main problem occurring in ecosystems exposed to an uncontrolled accumulation of nutrients from the catchment area is the eutrophication process [4, 5]
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