Case study: Increased capacity of sewer/drainage system, Paris

Description of the application

Paris has inaugurated in 2009 Europe’s largest underground stormwater storage tunnel to date, with a 1.86km long 30m deep tunnel of 6.80m diameter and a total capacity of 80,000m3. Total investment was € 109 M for this tunnel, however the total stormwater management master plan cost could exceed € 4 B.


Implementation cost

Estimated financial cost for the implementation of the measures, given as a cost range.

Flood management measure

Which flood management measures have been applied? Multiple measures may be specified.


Projects from which information has been harvested. Multiple projects may be specified.


Country in which the application (case study) is located. In case of a transboundary application multiple countries are specified.

Responsible authority level

Level of Responsible Authority.

Last modified: Sept. 13, 2016, 3:52 a.m.



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