Aim of the study:
This paper presents a verification of peak discharges of the great flood in July 1997 on the Odra river, for the section between Racibórz and Słubice.

Material and methods:
The carried out analysis included review of hydrological and morphological data, including GIS analysis, extensive hydrodynamic two-dimensional modelling and determination of rating curves for gauging stations.

Results and conclusions:
It has been found that previously published peak discharges for the flood in 1997 need to be altered to a significant extend. For instance, the maximum discharge in Wrocław is estimated to reach ca. 3900 m3∙s-1 against 3640 m3∙s-1 previously, while for the Nysa Kłodzka station (upstream) it has been raised from 3530 m3∙s-1 to 4300 m3∙s-1. On the other hand, for the section below Ścinawa station the peak discharges were significantly overestimated, even by 1000 m3∙s-1, which is up to 50% of the actual flow. The determined values are hydrologically and hydraulically consistent, i.e. fulfilling the low of flow continuity, considering tributary supplies, embankment failure and the retention capacity of the river valley.