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How to deal with 200 mln m3 contaminated river sediments Hilda van de Laar Province of Gelderland The Netherlands
Structure of presentation Dutch river system The problem Different approaches New solution Conclusion
Rhine and Meuse catchment areas
Dutch river system riverflood plaindike
The problem: flooding Usual level Flood wave
The problem: flooding Evacuation Dikeburst?
Approach: higher dikes?
Approach: more space for water
New problem excavate few hundred million m3 soil contaminated how to deal with it? 7 local governments cooperated in finding solutions
Standard solution clean soil can be reused in flood plain polluted soil has to be cleaned or dumped in large scale sites
Consequences standard solution very expensive spatial problems not suitable
New solution - 1 take into account recontamination level less polluted: reuse unconditionally in flood plain
New solution - 2 take into account recontamination level more polluted: in smaller sand excavation pits in flood plain
Consequences new solution solution within river system itself - no more spatial problems save several billion €
Political considerations many parties, many interests clearly define main goal accept some pollution will remain
Result Large scale measures: excavation of flood plain
Result More space for water
Conclusions standard solution was more ambitious, but impracticable – no environmental benefit new solution less ambitious but enables large scale measures – benefit for environment
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