Váh’s bottom is from gravel and the annual movement of gravel weired along the river is 50 000 m cubic. River Váh is the greatest water source of region where Piešťany belong. 3.3.2. Hydro-geologic information

The relief of area through which Váh flows is formed of rocks of tertiary age, partly mezolithic, rarely Paleolithic age. The area of Middle and West Beskydy is made of water non-permitting layer of rock, classical sea sediments, rhythmic changing of sandstones with clay. Outer west Carpathian mountains stand on Paleolithic sediments of slates and limestone. Inner layers are from sandstone and chalk limestone. Podunajská basin has structure of underlay from clay, gravel and sand. 3.3.3.Hydrologic information

Hydrologic relations of the flow of Váh are relatively good, if we are considering them from the agricultural point of view. Village Horná Streda has enough sources of water under earth and is rich for amount of water springs with different types of minerals. Váh is the main source of the underwater and it has important role in forming of regime of fulfilling of the water sources.

The average number of precipitation per year in Piešťany is 946 mm. During long lasting periods of rain there were raising floods in the past, if the river was no regulated by system of levees, dams and hydro centrals. The greatest flood was in august 1938. Literature records also catastrophic flood in august 1913. Annual year temperatures of water in river Váh in profiles:
- Under Kolonádny bridge 9,3°C
- Under Krajinský bridge 13,2°C
- Obtokové rameno * 10,7°C

Precipitation /year 1970/
- annual average 662,7 mm
- minimum 8,8 mm/ 24 hours
- maximum 90,0 mm/ 24 hours
- average for many years 600,0 mm

Barometric pressure
- annual average 751 mm
- maximal per year 768 mm
- minimal per year 727 mm


IV. Water basin Slnava

4.1 Water basin Drahovce-Madunice

Water basin Drahovce-Madunice is basin, with many functions, using part of river Váh between cities Piešťany and Hlohovec. In Piešťany it joins in 119,2th km on group of Váh’s cascade Kostolná – Nové Mesto nad Váhom – Horná Streda. The basin has been built in years 1956-1959.

It consists of water basin known as Sĺňava, dam in Drahovce, tributary of drainage canal and a hydro-central building. 4.1.1. Hydro-graphical information about basin

The basin is situated on straight flat ground, very close to Piešťany. The length of basin is 5,8 km.