That just my humble opinion. I'm not a professional meteorologist, but I did stay at a Holiday Inn last night.
The concept is that melting alpine glaciers don’t change the total amount of water in the rivers, but when it flows - rivers without lasting glacial feeds in many places have much lower summer/fall flows and heavier spring melt flows than those that are fed by permanent glaciers.
Of course, the whole “problem” is premised on “global warming” being real, so...