Hydraulic works on the River Nera to secure the areas at risk of flooding in the Conca Ternana (3rd functional section, Lot I)
In the urban section of Terni, between Ponte Allende and Ponte RFI Terni-L’Aquila, work is planned for the adaptation of the banks of the River Nera. The embankments will be reinforced with earth embankments to maintain high slopes and reduce the visual impact by greening. Bicycle and pedestrian paths and driveways have been created on the embankments to facilitate future maintenance activities. To protect a production area along the left bank of the Nera River, a concrete wall was built. For additional safety, a COR-TEN steel parapet was designed, which is resistant to floods with a return time of up to 500 years. In addition, to protect the RFI railway line, a galvanised steel structure with a 35.73-metre beam and COR-TEN casing was installed, capable of deflecting debris and absorbing shocks of up to 35,000 kg. A footbridge was also added next to the corten lattice girder to improve the protection of the railway bridge from accidental impacts. Upstream and downstream of the bridge, on both sides, greening gabionate root defences were installed to regulate the hydrodynamic flow and protect the bridge walls from eddies and current impacts. In addition, greenable reefs have been built at the base of the embankments to prevent erosion, while the reprofiling of the riverbed aims to favour flood outflow and reduce the backflow of the river.
