Preprints
https://doi.org/10.5194/nhess-2021-199
https://doi.org/10.5194/nhess-2021-199

  09 Jul 2021

09 Jul 2021

Review status: this preprint is currently under review for the journal NHESS.

The catastrophe of the Niedów dam – the causes of the dam's breach, its development and consequences

Stanisław Kostecki1 and Robert Banasiak2 Stanisław Kostecki and Robert Banasiak
  • 1Faculty of Civil Engineering, Wrocław University of Science and Technology
  • 2Institute of Metheorology and Hydrology and Water Management – National Research Institute

Abstract. Due to extreme rainfall in 2010 in the Lusatian Neisse River catchment area, a flood event with a return period of over 100 years occurred, leading to the failure of the Niedów dam. The earth-type dam was washed away, resulting in the rapid release of nearly 8.5 million m3 of water and the flooding of the downstream area with substantial material losses. The paper analyses the conditions and causes of the dam’s failure, with special attention given to the mechanism and dynamics of the compound breaching process, in which the dam’s upstreeam slope reinforcement played a remarkable role. The paper also describes a numerical approach for simulating a combined flood event along the Lusatian Neisse River with the use of a two-dimensional hydrodynamic model (MIKE21). The flood event occurred downstream from the dam. Considering the specific local conditions and available data set, an iterative solution of the unsteady state problem is proposed. This approach enables realistic flood propagation estimates to be delivered, the dam breach outflow to be reconstructed, and several important answers concerning the consequences of the dam’s failure to be provided.

Stanisław Kostecki and Robert Banasiak

Status: open (until 20 Aug 2021)

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Stanisław Kostecki and Robert Banasiak

Stanisław Kostecki and Robert Banasiak

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Short summary
The paper analyses and explains the conditions and causes of the Niedów dam’s failure in 2010, with special attention given to the mechanism and dynamics of the compound breaching process, in which the dam’s reinforcement played a remarkable role. The paper also describes a two-dimensional hydrodynamic model for simulating the flood event along the Lusatian Neisse River, including the determination of the dam’s peak outflow.
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