Accueil » Hydrogaïa – May 27th and 28th Hydrogaïa – May 27th and 28th Request Information SOMEZ renews its participation in the International Water Exhibition on May, 27th and 28th 2015, at the Montpellier Exhibition Centre. We will be present on D500 and E500 stands, in partnership with Swelia – network of which we are members.