Blal Adem Esmail Ph.D. defense on this topic represents, I hope the starting point of a more in deep relation between hydrological modelling and water management. His efforts were in defining an overall framework to analyse the problems, which represents a new starting point and, in my opinion, a good reference for who wants to work on ecosystem services and water.
I believe many indication either for policies and for science can be derived from his work. Presentation can be found here or clicking on the picture above. His thesis can be found, instead here.