Hydrological processes and water resources management / Rainfall in arid and semi-arid regions / Operational solutions of actual evapotranspiration / Surface runoff and sediment dynamics in arid and semi-arid regions / Water flow processes in arid and semi-arid vadose zones / Aquifer dynamics / Hydrogeochemical processes in arid and semi-arid regions - focus on North Africa / Human impacts and management issues in arid and semi-arid regions