The results of survey and hydrometric measurements and calculations made aimed for verifying of the rating curve of the cross-section in the km 8+400 of river Dłubnia, elaborated by Institute of Meteorology and Water Management (IMWM), were introduced in the work. This water-gauge, located above 300 m below the dam of water reservoirs in Zesławice, enables the recording of the water states, being the sum of outflow from reservoirs and the tributary of the waters of the Baranówka stream. The intensity of the water flow was calculated on the basis of the hydrometric data using the Harlacher’s method and using the Chézy’s formula. The rating curve, which was worked out on the results of measurements and calculations, was compare with the rating curve worked out in 1993 by IMWM Branch Cracow. It was stated that the maximal conveyance of river channel in water-gauge section, established according to the IMWM study, is 95.6 m³ · s^–1. However the maximal conveyance qualifying in results of calculation executed according to measurements carrying out in 2011 is equal 88.1 m³ · s^–1. Corrected, the lower conveyance of the channel of the Dłubnia river below water reservoirs, should be considered in the operation instruction of reservoirs in note relating to the outflows during the freshet.

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