Keywords:  rain surface runoff, drainage, catena, agroecological monitoring, drainage and surface waters, concentration of pollutants

Мелиорация.– 2025. – №4 (114). – P 38–43

In the field experiment and agroecological monitoring, an assessment of the quantity and quality of summer rain surface runoff and its impact on the environment in a  reclaimed agricultural landscape was carried out. It was found that when precipitation fell in the amount of 89 mm per decade with a maximum intensity of more than 1  mm/min, the maximum modulus of rain surface runoff in the amount of 0.0148 l/s•ha was formed in the catenum of the local catchment area of the reclaimed agricultural  landscape. According to the main indicators, the quality of surface runoff water is comparable to the quality of drainage water and differs from the latter only in a higher  dry residue. Under conditions of using catena soils under grasses and forests, most indicators of drainage and surface waters do not exceed the maximum permissible concentrations of pollutants. The exceptions are total iron and ammonia nitrogen, the concentration of which exceeds the MPC of fisheries water use by 1.5 times and 5 times, respectively, which creates risks of eutrophication of natural waters.