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