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  • Author or Editor: Zinaw Dingetu Shenga x
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The overall purpose of this research was to model flow extraction from several groundwater network wells to control the excessive level of groundwater. The study was conducted in the Nitra Industrial Park, which is located in the northern part of the town of Nitra, where the confined groundwater table is situated very close to the terrain. The area of interest is a plain with a mean elevation of 140.0 m a.s.l. The groundwater can rise up to 140.5 and 143.0 m a.s.l. during the dry season, extreme climate conditions, or a flood wave in the Nitra River, respectively. In order to keep the level of the piezometric head below 140.0 m a.s.l. (as requested by the investor), there are already 38 wells realized around the area of interest with the proposed pumping rates.

The numerical groundwater modeling was applied using the TRIWACO simulation package for the given hydrological, geological and hydro-geological conditions. The transient simulation takes into account a Q 1000 historical discharge in the Nitra River and its possible impact on the groundwater. The paper will present numerical modeling results on the design of a drawdown system to lower the groundwater level to an acceptable elevation as well as parameters and uncertainties for the design purpose.

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The new proposed railway network in the city of Bratislava, which is supposed to be connected to the airport, is an integral part of Trans-European Network for Transport .Certain section of the planned railway should be constructed along Carpathian Mountains through underground tunnels. However, the construction of this underground tunnel will adversely affect the groundwater flow regime. Therefore, it was necessary to establish a 2D finite element numerical model to evaluate the implementation of this railway tunnel on the groundwater regime as well as means of technical measures to reduce the impacts. The paper presents the model result, analyses, prognosis as well as possible methods to control the groundwater level regime in the aquifer that could be affected by the railway tunnel construction.

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