The thesis proposes a design alternative for the restoration project of an old existing hydraulic tunnel. The tunnel serves as a hydraulic connection between an impluvium and an artificial lake. The design study is carried out using numerical modelling techniques. A comprehensive geological, geotechnical, and environmental investigation was conducted to characterize the ground conditions and define the parameters required for the design. A numerical model based on the finite element method (FEM) was developed using RS2 software to simulate the excavation, tunnel installation, and backfilling stages. Several excavation and stabilization strategies were evaluated, including open trench slopes with different inclinations, berm configurations, and structural reinforcement using micropiles.