how to deal with 200 mln m3 contaminated river sediments hilda van de laar province of gelderland...
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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
river flood plain dike
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
Reuse as soilExcavate soil
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)
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
Result
History
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