Сoefficient of transition from maximal velocity to overall mean velocity in line gauging discharge section lines of Angara river, Lena river, Witim river, Yenisei river and their tributaries was analyzed. Dependence discharge on maximal velocity, maximal depth stream, width of the stream and coefficient of the river bed form four groups of streams with particular conditions of movement was calculated. Dependences end formulas can be used in hydraulic engineerings of hydraulic structures and hydro-meteorological service.