Erosion on the Oroville Dam Spillway

The area around the Oroville Dam in California is currently being evacuated as the primary spillway of the dam has been damaged from erosion. This article shows the huge holes in the concrete spillway that were caused by overflow of the dam from recent large amounts of rainfall. California was facing a huge draught up until recently, so the spillway had not been used in a long time. The damage from this erosion could lead to the failure of the dam and massive flooding of the area. This is an example of erosion on a very large scale. California is now hoping for no rain, which is a very different story from a couple years ago.