After examining the causes of the threat, the experts determined the following measures to secure the building.
The rocky ground beneath the sliding part of the structure was reinforced with cement injections, followed by approx. 100 m of retaining wall at the foot of the shore, and the escarpment above the wall was covered with pavement made of durable broken stone with cement mortar. The pavement was laid to the level of catastrophic waters. Bank areas lying above this level were stabilized by felling trees without grubbing up.
This part of the building was mostly stabilized, which showed a tendency to slide from the side of the Ropa River. For this purpose, foundations were uncovered in batches, both inside and outside the building, which were then concreted. At the same time, the rotation of part of the building was stopped using steel anchors. After the above-mentioned works were carried out in an emergency mode, the bank and the subsoil were strengthened as described above. Currently, the building is not subject to further deformations, and the fortified edge shows no damage, although it was heavily attacked more than once by the swollen waters of the river.
discussing the issues raised here, mention should be made of the planned works on securing monuments in connection with the construction of the Czorsztyn-Niedzica water dam on the Dunajec. In this case, we will limit ourselves to discussing the concept of securing the hill, on which the Niedzicki Castle is situated.
The castle in Niedzica was erected in the early 14th century. and extended at the end of the 16th century. is located on a lofty rocky hill on the right bank of the Dunajec River. Currently, the ruins of the so-called. upper castle with a defensive tower, located on the highest rock promontory, from the north and east, the rock plinth has very sharp land slopes reaching up to 66° in some places. From the south-east, the hill rises above the level of the plateau in height 24 m.
According to geological data, that the substrate, where the castle is located, is very diverse. The foundations of part of the upper castle are set on a limestone rock. In other parts of the castle hill, the rock is covered with a mantle of embankments made of sandy-clay formations, whose thickness under the foundations varies from 0,00 do 8,0 m.
It needs to be highlighted that, that these rocks are heavily fractured and have numerous uneven faults, and in some places, fissures filled with sedimentary formations or layers of clays and shales.
In the north-eastern and eastern parts of the hill, the slope is formed by a layer of rubble of varying thickness and an embankment loosely bound to the rock. Thanks to the strongly branched and lush vegetation, these layers are currently in a stable state.
This brief description of the morphology of the hill is needed, to understand, how difficult will be the problem of strengthening the banks in these conditions, in the future raising of the water table as a result of damming up water by the dam. The water table should rise approx. 50,0 m above the current level. The predicted band of fluctuations between the highest and lowest levels of the mirror, depending on the season and hydrogeological conditions, will be approx. 25 m. Rock soaking processes, irrigation and drying, waves, freezing and thawing will undoubtedly affect changes in the geological and engineering conditions of the slopes. You can predict now, that the geodynamic processes will accelerate, deterioration of the mechanical properties of certain rocks and soils, there will be deformations of the shores as a result of their descent by waves.