The goal of the study was to model a large Moroccan river's water system using the SWAT model. The researchers used this model to understand how rainfall, temperature, land use, soil, and groundwater interact in the Ouergha catchment. They ran the model for 24 years and found that evapotranspiration is the main water loss, followed by surface runoff, lateral flow, and aquifer recharge. The model accurately predicted monthly flow in most cases, but sometimes underestimated or overestimated due to irrigation and flooding.