More specifically, the technical interventions proposed in this section are the following: 1Barrier retention basin works which concern the containment of the buoys at the entrance of the torrent in the lowland bed of a useful volume of the basin of about 20000m3 2Barrier retention basin works which concern the length of about 13km near the settlement of Velvento and 19km downstream of the settlement3Technical overpass II works with a twin rectangular culvert of internal dimensions 500m x 300m base x 700m height which concern the construction of a technical overpass to replace an existing Irish-type overpass.