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UTILIZATION OF AN EXISTING MULTIPURPOSE SMALL WATER RESERVOIR IN REDUCING FLOOD FLOWS

Ing. Roman Vyleta, PhD., Ing. Peter Valent

Abstract

An increasing frequency and magnitude of flash floods motivates water managers and other authorities to focus on enhancing flood protection of small headwater watersheds, which are especially vulnerable to this type of flooding. One of the ways how to achieve this goal is to increase the volume of existing small water reservoirs (SWR) dedicated to store flood wave. This paper investigates the possibilities of utilizing a SWR Vrbovce (west of Slovakia), which is currently being used for water supply and fishery, in reducing flood discharges. Within the work a flood wave of a return period of 100 years was estimated using a design storm approach. The following assumptions were made: the design storm event generated a flood wave of the same return period; the design storm had a constant intensity and its duration was equal to the time of concentration; the shape of the flood wave hydrograph was triangular with a rising:falling limb ratio of 1:2. In order to transform the flood wave through the SWR a simple model was proposed taking into account hydraulics of the SWRпїЅs outlet objects. The flood wave transformation was carried out for the current state of the reservoirпїЅs operation as well as for three alternative scenarios with smaller values of the initial water volume. In addition a relationship was built between the water level and the transformation effect of the SWR. The results showed that even a small decrease of the initial water level could significantly increase the ability of the SWR to flatten the 100-year flood wave.

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DOI resolver: doi.org/10.5593/sgem2017h/33/s12.054

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