The command is intended to carry out a redefinition of the fostaatverzadigde areas for Flanders using the "Protocol Fosfaatveradigde Grounds" It should be made of the point measurements of the regional invetarisatie which run was completed for the purpose of the research project in 1997 / " phosphate saturation of sandy soils in Flanders "/. In the second part must be described at the gaps in knowledge about the leaching of phosphorus from agriculture to surface based on literature and own scientific expertise.