The study area was selected on the basis of the accessibility of topographic data and regularly repeated events. Which is located in the north-east of the Czech republic. Study area is Ostravica catchment (827.4 km2). The model was built using 1-D hydrodynamic program HEC-RAS. This work presents a comprehensive methodology for building of hydrodynamic model on large area (approx. Accurate modelling is essential not only for flood simulations but also for detection of events that can cause damage on property or human lives. The construction of accurate numerical hydrodynamic models is an important task for flood simulations. References: 14th International Multidisciplinary Scientific GeoConference SGEM 2014, SGEM2014 Conference Proceedings, ISBN 97-13-1 / ISSN 1314-2704, June 19-25, 2014, Book 3, Vol.
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