The purpose of research is the study of conditions of the formation of surface melt wa-ter runoff from loose ploughland on ordinary chernozem in Stavropol territory. Observations over the surface melt water runoff were held on ordinary chernozem in a private company with limited liability “Podluzhnoe” Stavropol territory in 2002–2015. Slopes of arable lands vary from 0.5 to 50 gradients, while the main ploughlands have gradients of 0.5–2.5 with southern and northern exposure. Erosion base is 30–50 m height and 1–2.5 km length. There are three replications of trials, the size of each pilot area is 1.0 ha. Observations on standard stationary runoff sites 270 meters long by 30 meters wide for determination the flow of melt- and stormwater were provided three-time by surface runoff research methodology. The influ-ence of water supplies in snow before snow melting + rainfall during the melting, depth of soil freezing, topsoil moisture (0–30 cm) and water permeability on snowmelt runoff was studied in 2002–2015 at the same sites. Studies have shown that the average runoff from loose arable land is 7.61 mm, and it is observed every 5 years (35.7 % probability). Water supplies in snow before snowmelting + rainfall during the melting on the loose ploughland are 39.01 mm aver-age, soil freezing depth is 44 cm. The average value of the runoff coefficient on loose arable land was 0.11. To reduce the slope runoff and water erosion the work on constructing water regulating forest belts on sloping lands, along the banks of the beams, ravines, around ponds and reservoirs are necessary.
Keywords: surface runoff, runoff coefficient; melt water, arable ploughland, water-permeability, soil erosion.
