1. Soil Erosion and Degradation Research Group, Department of Geography , Valencia University , Blasco Ibàñez, 28, 46010 Valencia , Spain .
2. U.S. Geological Survey, Water Resources Mission Area , Burlington, Vermont , USA .
3. Centre for Environmental and Marine Studies (CESAM), Dept. Environment and Planning , University of Aveiro , Aveiro , Portugal .
4. Institute of Hydrology, Slovak Academy of Sciences , Dúbravská cesta 9, 84104 Bratislava , Slovakia .