A stretch of bank along the River Tiber, approximately 10 metres high with a gradient of 30° and consisting of silt-sand soils, underwent a partial collapse as the result of flooding in November 2012, which adversely affected its stability. Liaising with the designer appointed to draw up plans for the repair work, the Geosintex engineering department presented a proposal, together with a relative feasibility study, to reshape the bank with granular material and incorporate six layers of EDILGRID type geogrid, spaced apart vertically at 80 cm intervals. The new surface of the bank was then greened, so as to protect against erosion, by laying a biomat. In addition, the foot of the bank was lined with 2 rows of Ecogreen FILTER UNIT gabion protection weighing 4 tonnes each, placed on a plinth of concrete, serving to control erosion while reinforcing and stabilizing the soil, as well as providing a measure of filtration. The installation proposed and adopted was put to the test by a further flooding event during 2014, similar to that of two years earlier. No signs of subsidence, deformation or erosion were observed.
