In Nysa, an evacuation of the city was ordered. Damage to the embankment on the reservoir on the Nysa Kłodzka River threatened to flood the city.
On Friday, the controversy was sparked by information from a local news outlet nowinynyskie.com.pl that it was not dropped then water from the Nysa reservoir. It is part of the Nysa Kłodzka cascade and excess water is collected there in the event of a flood threat.
– There is currently no such need. Each tank operates based on specific management instructions. waters. Currently, the Nysa reservoir can hold an additional 76 million m3 of water, which corresponds to 136 percent of the required flood capacity – said Jarosław Garbacz, spokesman for the Regional Water Management Authority in Wrocław, in an interview with the portal. He informed that the reservoirs “have large reserves”.
Just one day later increased tank discharges. At that time, Lake Nysa was 47 percent full, and Lake Otmuchowskie 36 percent. On September 15, it was reported: “In parallel with the development of the situation on the Odra River, the Flood Protection Operational Centers in Gliwice and Wrocław have developed an optimal solution to avoid the overlap of flood waves through the operation of the Otmuchów and Nysa reservoirs.”
Cash flows higher than forecasted
Due to the threat and evacuation of the city of Nysa, questions about the management of the filling level of the reservoirs on the Nysa Kłodzka cascade have returned to social media. We asked about this in in the office press office of Polish Waters.
In response, it was assured that water management in the Nysa Kłodzka Cascade reservoirs is based on “currently available data, including weather forecasts and hydrological forecasts of water flows in rivers and simulations of flows through reservoirs”. Management is “dynamic” due to the variability of forecasts. Waters Polish added that they must ensure that the peak waves from the tributaries and the dangerous flood on the Oder do not overlap. In response, we read:
According to the forecasts for 13.09.2024, the flows in the Nysa Kłodzka River were to be significantly lower than they are currently, which requires increased outflows, including from the Nysa Reservoir. The situation was additionally complicated by the failure of the Stronie Śląskie reservoir, which caused an additional inflow of water from the upper parts of the catchment area – such a situation also affects the forecast flows, which are subject to dynamic changes.