Estimation of Peak Flood Discharge for an Ungauged River and Application of 1D Hec-Ras Model in Design of Water Levels

Flood is one of the most serious environmental problems we face. It is impossible to construct a totally secure system of flood control, but is necessary to take all measures to reduce damage. The occurrence of high water level in the river bed, most commonly coincide with heavy rain, melting snow or both phenomena together. To construct hydraulic structures, it is necessary, among other data, to have information on high waters of different return period. As a large number of rivers in Bosnia and Herzegovina do not have continuous hydrological monitoring, high water cannot be defined on statistical approach. In this, empirical expressions are applied. This paper presents the application of rational methods for determining peak flood discharge of Lepenicki stream, sizing river beds and determine water level along part of riverbed using software package Hec-Ras.