Canada has several mechanisms that are intergovernmental boards. The Mackenzie River Basin Board comes to mind. In that agreement, there are requirements for bilateral agreements between adjacent and neighbouring provinces.
These boards give a more regionally based perspective in terms of water management considerations. They function to prevent conflict, and they also function as information forums where concerns are brought forward by neighbouring provinces with the intention of finding consensus and finding a resolution to any particular concern.
I chair both of the domestic water boards. They represent a significant portion of the drainage that occurs in Canada. The Mackenzie River drains 20% of our land base. I would suggest that the bilateral agreements embedded in that master agreement function to resolve, prevent and manage across provincial and territorial boundaries.