Help me to correct this English text on hydrology, please. Native speakers are better. Methodology of integral evaluation of the potential impact of continental runoff on the aquatic environment are developed and tested in relation to the catchment area of the White sea. An integral indicators of pollution potential (PP) and self-purification capacity (SPC) of the river waters are calculated within the boundaries of the hydrologic areas. The following indicators are used for calculating the PP: the volume of wastewater and the population density in the catchment area (anthropogenic components of pollution), sediment load (natural component of pollution). Such natural settings of the catchment as the lake percentage, woodiness and the role of topography in self-purification of rivers are used for calculating the SPC. The quality of river waters, entering the sea, is the result of the ratio of the proposed integrated indicators. On the basis of the quantitative ratios of PP and SPC the zoning of the catchment area according to the degree of the negative impact of river waters on water quality in the White sea are performed. The resulting zoning scheme is demonstrate a holistic picture, representing a complex of natural-economic factors on the river catchments of the White sea basin. The obtained results can be used for develop scientifically valid environmental programs and for planning industrial development in the catchment area.