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. Precipitation changes and water use patterns are two factors affecting the water quantity; obviously, hydrologic processes are always linked to many elements in the watershed scale, so to understand water management issues it is fundamental to analyze the different elements of hydrologic processes occurring in the watershed. In this study, the “SWAT” model (Soil and Water Assessment Tool) has been used to simulate the water balance for the present climate conditions on a semi arid watershed located in the central North of Morocco (R'dom). The study watershed covers an area of 1993 km 2 , and is hosting farming, pasture and forestry related activities. The water stress situation in the R'dom watershed can besummarized as limited resource facing increasing water demand. SWAT model was first run and calibrated under current climate; and was driven withdownscaled climate simulations to generate future hydrological projectionsfor R'dom watershed in the 2031 to 2050 horizon under two RepresentativeConcentration Pathways (RCPs): 4.5 and 8.5. The results of the study showedthat the water balance in R'dom watershed is dominated by evapotranspiration and the water resources distribution within the watershed is uneven and follows a decreasing gradient matching the flow direction. The main results of climate change scenarios showed that R'dom watershed will undergo significant decrease of water resources availability with more economic impact under the scenario RCP8.5 as all areas hosting the economical activities will be affected and the highest changes of water yield should be under this scenario.

Modeling hydrologic processes and potential responses to climate change in an agro-silvo-pastoral watershed in the Mediterranean area