It shows the urgency of the task of creating a methodological and program base that supports the adoption of pre-project solutions in the placement and justification of the parameters of prospective small hydro power plants in Kazakhstan. The questions of application of the data of geoinformation systems using SRTM DEM and ASTER GDEM in the making of a digital relief model are considered. Moreover, showed the using this application for preparation of the feasibility study for the construction of small hydro power stations. A brief overview of the used geoinformation systems tools is given. The deviation of proposed methods for making topographic maps was studied using the example of calculating the volume of the reservoir on the Baskan river in the Almaty region.