Geological hazards resulting from the planned construction of a water dam “Skalička” near the Hranice Karst and the Hranice Abyss


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January 2018


The basin of the Bečva River is among those areas in the Czech Republic that are most exposed to floods danger. The disastrous flood in July 1997 had a devastating impact on settlements in the basin and the zone along the Morava River also draining the catchment, thus becoming an impetus to seeking for best protection against floods. This also restored the plan from the first half of the 20th century to construct water management works in the vicinity of the spa at Teplice nad Bečvou and the municipality of Skalička. Currently, the works of medium size are proposed within the river stretch upstream of Skalička with a maximum water level of 265.00 m ASL, and the total volume of 42.1 million cubic meters. The planned dam of the reservoir is located roughly three kilometres in beeline from the Hranice Karst - more specifically, from the Hranice Abyss. The Hranice Karst of hypogenic origin is extending on the eastern tip of the Maleník fault block and forms part, along with the entire fault block of the Paleozoic sedimentary cover, of Brunovistulicum. On this basement there is a sequence of sedimentary rocks of Middle Devonian (Eifelian) up to Carboniferous ages (Mississippian/Viséan). The karst alone has developed in Devonian carbonates of Givetian to Tournaisian stages which are included in the Macocha and Líšeň groups of strata. The total thickness of limestones has not yet been established in this area and their basement was never reached by drilling. The thickness of the sequence of carbonate sediments can be assumed only indirectly based on the data obtained by drilling in the larger area (e.g. the Potštát-1 borehole confirmed the presence of carbonates at a depth of 4,200 m; the Choryně-9 borehole revealed the presence of carbonates at a depth of 1,462 m, reaching the underlying paragneiss; the Branky borehole reached paragneiss at a depth of 2,546 m under Devonian carbonates; and the Valašské Meziříčí borehole penetrated a crystalline complex at a depth of 1,462 m under Devonian carbonates. During the 1997 fl


Hranice Karst, Hranice Abyss, Teplice Nad Bečvou Spa, Bečva River, Skalička Dam

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Geoscience Research Reports, Vol. 51 (2018-01-01).