CLIMATE-CHANGE HYDROLOGY AND WATER-RESOURCES IMPACT AND ADAPTATION FOR SELECTED RIVER BASINS IN THE CZECH-REPUBLIC

The Czech Republic has a northern hemisphere Atlantic-continental type of moderate climate. Mean annual temperature ranges between 1.0 and 9 .4 degrees C (between 8.8 and 18.5 degrees C in summer and between -6. 8 and 0.2 degrees C in winter), Annual precipitation ranges between 45 0 mm in dry regions and 1300 mm in mountainous regions of the country. With its 2000 m(3) per capita fresh water availability, the Czech Rep ublic is slightly below average. Occasional water shortages do not usu ally result from general unavailability of water resources but rather from time or space variability of water supply/demand and high degree of water resources exploitation, To study potential impacts of climate change on hydrological system and water resources, four river basins have been selected in the territory of the Czech Republic: the Elbe Ri ver at Decin (51103.9 km(2)), the Zelivka River at Soutice (1188.6 km( 2)), the Upa River at Ceska Skalice (460.7 km(2)) and the Metuje River at Marsov n. M. (93.9 km(2)). To simulate potential changes in runoff , three hydrological models have been applied using incremental and GC M (GISS, GFDL and CCCM) scenarios: the BILAN water balance model, the SACRAMENTO (SAC-SMA) conceptual model and the CLIRUN water balance mod el. The paper reviews methods applied in the study, results of the ass essments and concludes with suggestions for possible general adaptatio n policy options where the preference is for nonstructural measures su ch as water conservation, efficient water demand management and protec tion of water resources.