This is what happens when engineers build stuff to stop dams from flooding.

Witness the Glory Hole Spillway at Lake Berryessa. Aka, "this is what happens when engineers build stuff to try to prevent dams from flooding."

For the first time in a decade, January and February have brought so much rain that the lake in the Napa Valley area north of San Francisco has maxed out its water capacity. To prevent flooding, this 72-foot-wide concrete funnel is sucking down the excess. Hundreds of locals have gathered to watch the show and take photos and videos since it started on Friday. And the show isn’t over. More storms are expected toward the end of the week, and the flow may continue for up to two weeks.