The construction of correlation curves between flows and water levels Q = f(H), varying in the downstream pool sections as a result of river-bed transformation over the operating period of hydroelectric complexes, is limited to the observed flow rate values. The calculation of the Q = f(H) correlation curves, covering the entire range of possible water flow variations, is based on solving a problem of constructing a free water surface curve using a one-dimensional mathematical model of the river flow, which accounts for the morphometry of a transformed bed of the downstream pool.
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