He was President (2011-15) and appointed Honorary Member (2017) of the International Association for Hydro-Environment Engineering and Research.
Roedd yn Llywydd (2011-15) ac fe’i penodwyd yn Aelod Anrhydeddus (2017) o’r Gymdeithas Ryngwladol ar gyfer Peirianneg ac Ymchwil Hydro-Amgylchedd.