purpose. To substantiate methods for modeling the earth's surface subsidence in the process of its undermining by stoping in the Western Donbas mines. The methods make it possible to develop the automated system determining areas and volume of the earth's surface flooding to minimize hydroecologic risks while closing down mines in the Western Donbas.methodology. The work substantiates methods to model processes of the earth's surface subsidence helping identify areas of the flooded surface as well as its volume. Therefore, the two types of models (the interpolation model and polynomial one) to con struct surfaces with a regular network have been considered. The models make it possible to get adequate idea of surfaces; more over, they are the basis to calculate volumes, represented in the form of total unit prisms in terms of network node.findings. The developed mathematical and algorithmic apparatus has made it possible to develop effective models of the earth's surface and an aquifer as well as to calculate the zone volumes between the reference earth's surface and the consolidated one as well as between the aquifer to identify the flooded areas.Originality. Methods to model processes of the earth's surface subsidence for hydroecologic risk minimization in the process of mine closing down are substantiated.practical value. The work develops hardware and software to provide efficient modeling of the earth's surface subsidence while mining coal seams and to reduce errors while calculating the immersed surface zone volumes.