Value of those alternatives foregone when implementing a NWRM.

Opportunity map (OM) for water retention is a spatial representation of the potential for different types of Sponge Measures/NWRMs to be implemented in a particular area. It can be used to identify areas where water retention measures could be effective. For example, in terms of general enhancement of water retention capacity, reducing flood risk, negative effects of drought, ....

Ditch blocking in managed peatland forests can be used to slow water and trap sediment after forest harvesting. The ditches can be made of wood logs or gabions, for example.
- Elaborated by NWRM project experts and validated by the European Commission