water cycle
hydrological services and observatories
hydrology
atmospheric precipitation
surface water and ground water
mediterranean basin
water resources assessment
environmental degradation
hydrometry
The sustainable and efficient management of the water resources requires a thorough understanding of their availability and variability both in space and time. This knowledge is based on hydrological information systems, which allow easy access to reliable and consistent hydrological data on rainfall, river flow, water quality, etc.