 The regional component consist of a number of elements such as water availability, socio-economic aspects, investment needed, opportunity cost and is established every year by the local CAR, who also collect the fee and have to be invested in the watershed according to the PIOM.Water use charges for the volume of water abstraction to all users who are granted water concessions.Erosion is a natural phenomenon which can be aggravated by manmade situations increasing risks produced by landslides, flood, avalanches, mudfloods, etc..