The levees around basin are built up from gavel and sand material with steep slopes. Underwater trough serves as a way for water which passes through the levees to valley gravels. 4.1.2. Hydro-geological information

Quartet sediments – sands, clays, sandy clays and gravel-sandy sediments. Neogenic sediments – clays, sandy clays, rough sands, neogenic gravels. 4.1.3. Hydrologic information

- area of the water basin during the highest level of water 4,3 km
- overall volume 12,2 mil m
- volume of water in use 4,2 mil. m
measured by VÚVH Bratislava y.1978 only 3,3 mil. m
- stable volume 8,0 mil. m
- maximal flow of water Q 100 3400 m/s
- minimal flow of water Q min. 21,5 m/s
- average flow of water 153,9 m/s
- long-lasting average discharge per year 4845 mil. m
- average annual precipitation 928 mm


Water basin Sĺňava was planned as source of water for with many functions as for agriculture, uptake of industrial water, protecting of thermal sources in Piešťany, tourism and production of electric energy. 4.2 Description of areas of water basin Slnava

Water basin Sĺňava was built in 1959 by damming the rivers of Váh. It has area about 430 hectares and has a pear-like shape. The banks of the basin are from sand and gravel material, few times being tightened by gravel. After building the dam were the sides of basin in its southwest part strengthened by great rocks. In the sixty’s were on the shores planted willows and after time they spread to form continuous water-liking communities of willows of many species. They spread almost around whole Sĺňava. The levees are of different thickness and rise up to 130 cm above the water level. The way around basin was firstly a clay road, but later it had been covered with asphalt. The levees of basin, whose height is max. 8,9 m and their overall length is 7,2 km, are in fact zone of mezophilic meadows. Besides the surrounding levees of basin, there are also two wharfs. The left one is long 150 m and it is spread to a circle at its end to form Ratnovská bay. The second wharf is shorter, it forms little bay which serves as dockyard for water sports in Piešťany.