Аннотация:On example of rivers of snow-glacial type of flow formation, located in the North Caucasus, Altai, Tien Shan and the Pamirs, considered the following questions: a) Modeling and calculation the components of
the annual water balance equation (precipitation, evaporation and glacier runoff); b) New formulae to calculate intensity of melting snow and ice and spatial extrapolation of air temperature and precipitation; c) Change the area of glaciation in 1946-2005 and assessment the quality of area-altitude parameters in modern glaciological reference books (Catalogue…,volume 8, 14, 15; Щетинников, 1988; Hagg et al., 2015; Nuimura et al., 2015; Randolph…, 2015; RGI Consortium, 2017); d) Peculiarities at the calculating of total melting of glaciers populations; d) Determination the area of snow coverage in river basins by means of data from satellite MODIS and its using for seasonal runoff forecasts.