The foundation of California’s water supply and the catalyst for the state’s 20th century population and economic growth is cracking. More exactly, it’s disappearing.

Climate change is eroding the mountain snowpack that has traditionally melted in the spring and summer to fill rivers and reservoirs across the West.

Now, with less precipitation falling as snow and that snow melting faster and earlier in parts of major mountain ranges like California’s Sierra Nevada and the Rockies in the West, managers of a major Sierra Nevada watershed east of Sacramento are replumbing their water systems to better handle bursts of rain instead of trickling snowmelt. Their “Supershed Approach” to replace the loss of the once-reliable snowmelt is being touted as a possible model for other Western watersheds that are expected to experience stronger, more frequent snow droughts.