Over 90 per cent of the world population lives in countries that share a river basin with others. Freshwater resources are scarce and different nations, actors and users compete for limited resources in transboundary river basins; often conflicting with each other. Water is a resource with no substitute: it cannot be secured in sufficiently large quantities through long-distance trade deals; and, due to the interconnectivity of the hydrological system, the actions of one country in its water management have a direct bearing on the interests of neighbouring countries. For instance, in the...