After the three years, the extensive reconstruction of the Šance water reservoir ended in the Moravian-Silesian Region. Since the construction of the dam in 1969, it was the first such a large and extensive reconstruction for about 440 million CZK. The main purpose of the reconstruction was to strengthen the flood protection, better water flow regulation and efficient drinking water supply and, above all, to improve overall operational safety.
The preparation of the extensive reconstruction lasted almost 10 years. The requirements for capacity and operation were not so demanding when building such a big dam 50 years ago, nowadays the dam should retain up to ten-thousand year water. Most of the works has therefore been concentrated to the vicinity of the dam and measures have been put to place to help with such extreme floods.
The builders have increased the crest dam, generally reinforced the dam with the limestone from the nearby landslip which also endangered the dam´s safety, have built a storage addit but after all they have raised the spillway, extended twice the slipping capacity, the so called “plunge pool”, i.e. the place where the water flows out of the reservoir into the riverbed. “Our company have applied and significantly depended our experience of water management structures of this kind”, said the CEO of the Company Ing. Roman Kocúrek.
The modernization also affected the water management system and the system for measuring, observing and collecting water management data which are sent by remote transmission to the central dispatching center in Ostrava. The technical facilities are located in the newly built operating center where an information center will be created in the future. The dam of the water reservoir is part of a hiking trail, so it is counted with the interest of the passers-by.
The reconstruction of the water reservoir was carried out in normal operation with minimum limitations. It was designed by the Aquatis company from Brno. The investor is the owner and manager of the Oder River Basin, the Ministry of Agriculture also contributed financially from the subsidy program of Flood Prevention III.