1. Associate Professor, ENSAM, 2 Place Viala, 34060 Montpellier, France. E-mail: belaud@supagro.inra.fr
2. Researcher Hydraulic Engineer, Cemagref, UMR G-EAU, B.P. 5095, 34196 Montpellier Cedex 5, France. E-mail: xavier.litrico@cemagref.fr
3. Researcher Hydrology, HKV Consultants, Botter 11-29, 8232 JN, Lelystad, The Netherlands. E-mail: b.de.graaff@hkv.nl
4. Researcher Hydraulic Engineer, Cemagref, UMR G-EAU, B.P. 5095, 34196 Montpellier Cedex 5, France. E-mail: jean-pierre.baume@cemagref.fr