摘要：This article describes the methodology of hydraulic calculations to estimate the water levels in open channels for steady gradually varied flow.The presented method has been used to analyse the water level on the Vistula River from Włocławek cross-section to Toruń cross-section.The HEC-RAS modelling system has been used for parameterization of the river channel and floodplains,as well as for flow simulation.The results obtained have been the basis for assessing the impact of maintenance of floodplains on water level during maximum discharges.
关键词：floodplain inundation;gradually varied steady flow;flow capacity of the river;mathematical modeling.
