The European Geosciences Union (EGU) has awarded the John Dalton Medal to Peter A. Troch for his seminal contributions to hydrology in the areas of modelling, remote sensing and development of new ecohydrologic theories. The John Dalton medal is awarded to one recipient annually for distinguished research in Hydrology. Through his outstanding publication record, and through participation in and leadership of several international research initiatives, Troch has become a world leader in his field. Of particular note is his pioneering work on the hillslope-storage Boussinesq model and a revitalization of Robert Horton’s 70-year old work on vegetation water use efficiency, his leadership of the CAHMDA series of workshops on data assimilation and his current leadership of the NSF Hydrologic Synthesis project.