Futurology

"It has also become more erratic and unpredictable," she told the newspaper, "and we are facing growing problems of either too much or too little water."

Climate change disturbs the rainfall distribution patterns, leading to extreme rain in some areas and less in others. It's a very complex system and there are a lot of variables evolved. One example is changing wind patterns that creates high pressure regions that we see during heatwaves.

Warmer air can hold more water, so humidity increases. It also drives stronger winds...

Honestly I highly doubt all Rivers are drying up. Maybe some. Others will grow. Q

Rivers are estimated to be 0.06% of all water on the planet, of which 96% is the ocean, literal drop in the bucket