Monitoring and assessment of well quality of water infiltration intakes in water reservoirs in the south-east of Belarus

Aim. Comparison of water quality according to 19 indicators: odour at 20 degrees C, odour at 60 degrees C, taste, colour, turbidity, total iron, permanganate oxidation, dry residue, total hardness, oil products, surfactants, phenolic index, nitrates (NO3-), chlorides (Cl-), fluorides (F-), sulphates (SO42-), zinc (Zn2+), copper (Cu, total), pH value of two infiltration water intakes in the south-eastern region of the Republic of Belarus. Identification and analysis of linear trends, and determination of trends in the dynamics of indicator values. Material and Methods. As initial data we used the results of quarterly measurements of the values of borehole water indicators of the infiltration water intakes. Results. By comparing the relative concentrations of the mean annual values of the studied quality indicators for two water intakes, it was revealed that the priority indicators are odour at 20 degrees C, odour at 60 degrees C, taste, chromaticity, turbidity, and iron. By comparing the relative concentrations of total iron, it was found that the concentration in the wells of WI 1 is much higher than in the wells of WI 2, probably due to the presence of rocks and minerals from moraine and fluvioglacial complexes of glacial deposits. For other indicators the values were approximately on the same level. Conclusion. By constructing matrices of pair correlation and geographic proximity for each of the priority indicators, well groups were identified whose water quality is interrelated and which were subsequently aggregated as a single group.