A hydrologically correct digital model of the bottom topography of the Lena River basin with a resolution of (1/3)° x (1/3)° is constructed. Based on the linear model of forming a water balance in the river-bed network and a model network of river channels schematized in the form of a graph of a model system of river channels, daily, monthly, and annual flow hydrographs in the closing range Kyusyur of the Lena River were calculated. As an information support for the model, the global MERRA reanalysis database for meteorological parameters for 1980-2011 was used.

It is shown that it is possible to attain a satisfactory quality of the river flow calculation (the correlation coefficient with the observed discharge values is 0.88 using the linear model) and a fairly good agreement between the real and the model catchments.

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