Abstract
Water reservoir hydrosystems are built to control flow in time as well as to fight against flood. For this purpose, discharge structure carrying capacity is set with respect to structure class, water users water consumption schedule, provision percentage in accordance with regulations, not taking into account the impact of carrying capacity on operation of structures in water reservoir hydrosystem. The main goal of the given work is to determine the impact of discharge structure carrying capacity on drawdown velocity in Tupolang water reservoir. The task is accomplished with the account of discharge and outlet structure joint operation depending on water levels in the reservoir that drawdown velocity increases from 11.98 m/day to 16.1 m/day for low levels in the reservoir in narrow canyon. For other horizons drawdown velocity in the reservoir is observed to range from 4.62 m/day to 11.63 m/day. These velocities are tens of times higher than allowable normative velocities for drawdown (0.3÷0, 5 m/day), and it decreases the reliability and safety of earth fill dams in particular.
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