This paper focuses on the flash flood assessment
using a spatially-distributed hydrological model based on
the Monte Carlo simulation method. The model is implemented
as r.sim.water module in GRASS GIS and was applied
to the Malá Svinka Basin in Eastern Slovakia where a
heavy rainfall (100 mm/hr.) caused a flash flood event with
deadly consequences in July 1998. The event was simulated
using standard datasets representing elevation, soils
and land cover. The results were captured in time series
of water depth maps showing gradual changes in water
depths across the basin. The hydrological effects of roads
in the study area were simulated using the preferential
flow feature of the model. This simulation helped to identify
source areas contributing to flooding in built-up areas.
The implementation in a GIS environment simplifies
the data preparation and eventual modification for various
scenarios and flood protection measures. The simulation
confirmed excellent robustness and flexibility of the
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