Events related to the flooding of Nysa and the break-up of the dam in the Śląski organization have caused serious consequences for both the local community and the management of the water economy in Poland. Although the available documentation indicates that specified a script should not take place, the water flooded the city of Nysa, forcing residents to evacuate. Meanwhile, the territory Attorney's Office in Świdnica began an investigation into the breach of the barrier in the Świdnica Party. president of the State Water Farm Polish Joanna Kopczyńska announced an in-depth analysis of the reasons for this event.
Documentation and reality: Divergentities in flood hazard management
During the gathering of the Committee on Maritime Economy and Inland Shipping, president Kopczyńska was asked why Nysa was flooded. According to the available documentation, the river should have stayed in the trough. The flood hazard management plan and flood hazard maps indicate that the maximum allowable water discharge from Lake Nyski is 1,400 m3 per second, but the largest recorded discharge was 1,000 m3 per second.
"To ask why what happened in Nysa I am incapable to answer today. This will require expertise, due to the fact that from all the documentation we have, it is clear that nothing should happen there," said Joanna Kopczyńska.
Possible causes: atmospheric and infrastructure factors
One of the reasons considered may be the accumulation of rainwaters flowing from the city. dense rainfall may have caused the riverbed to be incapable to hold more water. Additionally, the analysis will cover the state of flood shafts, which according to plans should have kept the water in the trough.
– “The rainwater from the city could happen – terrible rainfall. This requires expert hydrologist, where else the water came from and what made the trough incapable to hold the amount of water it should have," Kopczyńska said.
Flood Reserve: Could it have been better exploited?
The president of the Polish Waters pointed out that the retention tanks in the area Nysa had a flood reserve of 178 million ml of water, of which about 155 million ml was used, meaning that there was inactive a reserve of 23 million ml. Nevertheless, there was no request to increase the reserve.
Human Factors: Who Makes Decisions?
One of the key questions raised by Deputy Marshal Krzysztof Bosak of the Sejm was who, in a crisis situation, makes decisions to depart from the standard procedures to save cities.
– "Decisions fall into the centre of flood protection, which is located in the Regional Water Management Board. The manager of the Centre, who may besides be manager of the local RZGW, is liable for these decisions," explained Kopczyńska.
Flooding in Nysa: Effects and corrective actions
Nysa's flooding had disastrous effects on the local community. After breaking the shaft, the water from Nysa Kłodzka began flooding the streets of the city, reaching even the region hospital. Mayor Nysa issued an appeal for self-evacuation of residents and ordered repair of damaged shaft along Wyspiański Street. Due to the threat, Polish Waters decided to reduce the discharge of water from a 1000 to 800 ml per second.
Breaking the Dam in the Silesian Party: Investigation of the Prosecutor's Office
At the same time, the territory Attorney's Office in Świdnica began an investigation into the interruption of the dam in the Świdnica Party. The reservoir on the creek Morawka adopted a 320 m3/s flood wave, which importantly exceeded its designed capacity of 70-80 m3/s. As indicated in the message of the Polish Waters, the work carried out on the reservoir did not affect the stableness of the dam's construction.
Summary
An investigation is presently underway to clarify all the circumstances of this event. Experts will analyse the causes of the accident in detail, and hydrological expertise is to aid find why flood systems failed. The flooding of Nysa and the interruption of the dam in the Śląski organization are evidence of the request for constant monitoring and analysis of water infrastructure in Poland.
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Polish waters will conduct a “analysis” of their mistakes. The D.A. is investigating a broken dam.
