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Reservoir sedimentation is a crucial challenge in planning and managing sustainable surface water resources in arid and semi-arid regions and must be assessed with accuracy. Both data-based models and conceptual models can be valuable tools for predicting reservoir sedimentation. In this study, we used an artificial neural network (ANN) approach and a modified Universal Soil Loss Equation coupled with multiple linear regression (MUSLE-MLR) model to predict yearly sedimentation in the Sidi Mohammed Ben Abdellah reservoir, located in a semi-arid region of Morocco. To construct the MUSLE-MLR model, we first calibrated and validated the MUSLE on 32 storms at four gauging stations upstream of the dam to estimate the sediment yield at these four gauging stations; we then developed the MLR model for combining sediment yield and reservoir sedimentation. The results of this model were then …