Californians are bracing for the arrival of more atmospheric rivers over the coming weeks that could dump rain on the state's massive snowpack and dramatically increase the risk of flooding.
“This is a good pattern for drought relief," UCLA climate scientist Daniel Swain told Yahoo News about the rain and snowpack."But we’ve got to think about what happens when that all comes downstream in the late Spring and early Summer. There’s almost guaranteed to be at least minor snowmelt flooding this year. The question is whether we’re lucky and it’s nice and gradual and it doesn’t cause any big problems. Do we get some huge early season heat waves? That would be big uh-oh.
“There’s no way to know. It depends on where that storm comes," Gleick said. “Probably the most vulnerable area, generically speaking, is Sacramento on the American River. The main reservoir that protects Sacramento from flooding is Folsom, which is on the American River. Folsom, I think everyone would acknowledge, is undersized for the level of protection that Sacramento really needs.”
“We have the classic dilemma in California which is that we want to keep our reservoirs relatively empty in the winter for flood protection, and we want them as full as possible at the end of the rainy season in April," Gleick said."The biggest demand for water is during the dry season, April through September, the growing season. So reservoir operators have to balance those two things.
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