Representation of heavily modified waterbodies which have been physically altered by human activity that they can not achieve good ecological status as defined by the water framework directive (DIR 2000/60/CE) and that no technical feasibility or cost-effective option exist to stop that human activity. These water bodies have the good ecological potential as the environmental objective. They have nevertheless to achieve good chemical status.

Representation of the watercourse within a surface water body. Designation of natural surface water bodies and heavily modified water bodies (HMWB). Surface waters which have been physically altered by human activity that they cannot achieve good ecological status as defined by the water framework directive (DIR 2000/60/CE) and that no technical feasibility or cost-effective option exist to stop that human activity, are designated as heavily modified water bodies. These water bodies have the good ecological potential as the environmental objective. They have nevertheless to achieve good chemical status.