Flash floods are becoming a phenomenon that troubles people more and more often in many Slovak under-mountain regions and society needs to deal with these extreme natural events. This article is showing an example of mathematical modeling of flood protection measures in Small Carpathians region. To secure flood protection, detention reservoirs have been proposed, because of their automatic function that is important due to rapid progress of flash floods. As a base for this project a previous work that attempted to reconstruct the flood has been used. HEC-RAS 4.1.0 software package was used for numerical modeling, which includes flood mitigation calculation. Six variants of proposed detention reservoirs were created and checked by a design flood wave that was created according to rainfall with recurrence period of 100 years. All of the proposed detention reservoirs have exact proportions needed to secure flood protection including height of the dam, length of the dam in crest, type and dimension of outlet and dimensions of emergency spillways. The modeling included flood wave passing during several situations - normal function of detention reservoirs, blocked outlet and dam break. This study should be considered as a base for future flood protection project. An extensive terrain survey has been performed in frame of this project.
Authors:Michaela Červeňanská, Adam Janík and Dana Baroková
Drainage channels are artificial multi-functional elements in a landscape, which have their own specific functions. Although they are primarily used for the drainage of water, they can also even be used for an opposite function, i.e. the artificial water supply of specific regions. This article presents an evaluation of infiltration experiments in drainage channels in the southeastern part of Slovakia. These experiments served for the collection of input data for numerical modeling, especially the determination of the soil type and hydraulic conductivity. The methodology of experimental works in the field as well as some basic information about their evaluation is included.
Authors:Lea Čubanová, Andrej Šoltész and Adam Janík
Implemented flood protection measures come to a re-evaluation due to changes in the hydrological situation, due to more recently occurring flash floods whose robustness exceeds the capacity of the measures initially proposed. The problem is the structures constructed on the streams as well as the unpermitted house building on the banks, the pollution of the stream or sedimentation. Case study on small catchment with problems of flash floods in the middle Slovakia was solved. Stream channel capacity was not sufficient for higher flow rates; therefore new flood protection measures were proposed (river bed training, low training walls, detention reservoir). Their efficiency was verified via mathematical modeling.