Yes, that's a good point.
We should perhaps give priority to knowledge about aquifers or about transboundary basins between the provinces in particular.
That said, the geological formations and the environments where water systems are found are very different from one end of the country to the other. In Quebec, our aquifers and our rivers and watercourses are very different from the ones in British Columbia, just as the climate is. It is therefore very difficult to have a comprehensive formula. The provincial or local level is probably where characterization or knowledge is best acquired.