Water losses risk assessment: an example from Carpathian karst |
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Authors: | Sasa Milanovic Zoran Stevanovic Igor Jemcov |
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Institution: | (1) Department of Hydrogeology, Faculty of Mining and Geology, University of Belgrade, Djusina 7 str, 11000 Belgrade, Serbia |
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Abstract: | The multipurpose dam and reservoir “Bogovina” in the Crni Timok valley is one of several projects that have been initiated
to improve water availability in Serbia. The site and height of the dam were initially proposed without consideration of risk
factors such as water leakage or stability of the banks. Later, complex hydrogeological and speleological surveys and tests
identified the potential of significant water losses from the reservoir area connected mainly to the karstic aquifer, and
the nearby Bogovina cave system. The analyses show that once the reservoir is filled up, groundwater flow currently oriented
towards the future reservoir would saturate the upper part of the karstified rocks, reactivate currently unsaturated pathways
and form a reverse discharge outside of the reservoir area. In response to these findings, the dam design and technical details
have been adapted accordingly: the dam height has been reduced by 9 m, and it is proposed that grouting and consolidation
work be conducted both at the foundation of the dam and extensively on the embankments. It was concluded that although the
proposed remedial measures cannot guarantee reservoir tightness, they can reduce the risk of large-scale leaking. |
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