Water resources management represents a particularly complex challenge in mountainous contexts, where climate change and increasing water demand exert additional pressure on hydrological systems. This thesis aims to analyze how water resource management is influenced and reshaped by the construction of new hydraulic infrastructures in the Orco River basin, located in northwestern Piedmont at the foot of the Southern Graian Alps. The study area was represented and modelled using the WEAP (Water Evaluation and Adaptation Planning) software. WEAP is a software tool used for hydrological modeling that supports water resource planning through alternative scenarios based on different water allocation strategies. The implemented scenarios include the introduction of the new Valle Orco aqueduct and a new reservoir on the Soana River.