Periods of maximum glacial ice (we are still in the “Ice Age”) have SEVERE droughts. All of the water is locked up into the ice (think miles thick at Chicago and the south pole as well).
Warming will of course cause glacial-fed creeks and rivers to run lower as the glaciers get smaller. (And finally drying up once the glacier is gone). But overall, more water into the hydrologic system.
But the stop glaciers from vaporizing global tax sounds more important.