It is easy to forget that many North American communities, particularly in the Canadian prairies, also depend on water that originates in mountain glaciers. Case in point, the stunning figure at right.
The shows the model-calculated river discharge of the North Saskatchewan River (at Whirlpool Point), which flows across Alberta and Saskatchewan, with (light blue) and without (dark) blue the contribution from glaciers in the Rockies. The figure was reproduced by Natural Resources Canada from an article by Comeau et al. in Hydrological Processes.
The key change, obvious from the figure, is that without the glacial water source, there will be a huge decrease in summer water flows. The result is a more typical snowmelt-dominated hydrograph (chart of seasonal river discharge), similar to something you'd see in another part of the continent.
