To assess the (additional) cost for ecosystem-based landscaping the contractors need to be consulted. They can provide information on:
- critical depth thresholds for sand extraction and costs per type of TSHD, as limitations to the maximum extraction depth;
- design boundary conditions for ecosystem-based sand extraction sites based on technical feasibility;
- unit cost for sand extraction or cost function per m3 and sailing distance; the cost for the sand extraction works itself;
- additional cost for ecosystem-based sand extraction projects, like creating deep troughs or leaving shallow crests.