This measure is usually carried out in form of sets of barrages built in a direction perpendicular to a stream’s direction. The aim of the measure is to modify the erosion and accumulation processes in torrent streams through the retention of water and eroded material, e.g. when settlement areas are at risk. It effect is…
Sand and bedload traps are technical installations which are located instream or as bypass to water courses. In the event of flooding, they slow down the speed of the water and lead to controlled sedimentation of transported material. To prevent debris and timber from blocking water courses in forests and on agricultural land, wooden or…
Permeable paving is designed to allow rainwater to infiltrate through the surface, either into underlying layers (soils and aquifers), or be stored below ground and released at a controlled rate to surface water. Sealed surfaces can be replaced by different materials, such as gravel turf, grass pavers, concrete pavers with drainage or porous concrete. This…
In case of a major danger, it might be useful to relocate existing buildings. Due to the avoidance and removal of the damage potential the resettlement and reallocation effects the risk reduction permanently. Financial support facilitates the implementation of the measure. Resettlement and reallocation measures need to be assessed and reviewed in advance. Social and…
Risk awareness grows and turns into action when recurring and continuous information and personal expert advice are provided to private home owners as well as to public bodies. Contact persons and public consultation hours offer a greater guarantee of success than online information services or advertising campaigns. Acceptance of measures can be additionally promoted if…
Infiltration cells/trenches and gravel drains (with an overlying swale, as deep bed or tree planting pit) reduce runoff rates and volumes by retention/detention and therefore can help replenish groundwater and preserve base flow in rivers. They treat runoff by filtration through the substrate in the trench and subsequently through soil. They are effective at removing…
