Toulouse dykes: reducing failure hazard combining structural reinforcement works and organization measures
1 ISL Ingénierie, 15 rue du Maréchal Harispe, 64500 Saint Jean de Luz, France
2 Arbeausolutions, 100 impasse des Houilléres, LePontet, 13590 Meyreuil, France
3 DDT31, Cité Administrative, 2 boulevard Armand Duportal, 31074 Toulouse, France
4 Toulouse Métropole, 6 rue René Leduc, 31505 Toulouse, France
5 Mairie de Toulouse, 1 place du Capitole, 31000 Toulouse, France
a Corresponding author: email@example.com
Toulouse dykes include 16 km of various types of dykes and flood gates and stoplogs, belonging to several owners including Toulouse City and French State (DDT31) that own about 13 km. The Toulouse dykes Hazard Study has been made in 2014-2015. The study includes:
An estimation of the probability of failure, evaluated as low, including for the 1875 reference flood, except on a few dykes sections that were already planned to be reinforced.,
An estimation of the severity in case of failure (population exposure) by flood hydraulic modelling. Toulouse city being an important city, the population exposure in case of dyke failure is quite high.
An assessment of the criticality of the different dyke sections. The criticality level of the dykes has been globally estimated as acceptable, after planed works will be completed.
Temporary mitigation measures have already been included in the flood management plan, and consist in preventive evacuation of exposed population for flood levels lower than the 1875 reference flood level, as long as the reinforcement works are not completed. Several additional mitigation measures have been proposed such as: structural reinforcement of a few dykes section, a vegetation management plan, and improvement measures of the flood management plan and the need to continue regular training emergency exercises.
© The Authors, published by EDP Sciences, 2016
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