The basins act like a big bathtub, and the tower inside the basin is like a drain, pulling out all the water and leaving the mud and debris inside the basin.
The debris basins are vital for flood control and act as the first line of defense in protecting communities against mudslides.
Last storm season after the massive Station Fire, the basins did their job for the most part, capturing more than 1 million cubic yards of mud and debris - that's enough debris to fill the Rose Bowl.
The expansion project will work to better protect communities from mudslides this storm season. The damage from the Station Fire has accelerated the project, and more work will need to be done in the coming years to further protect the communities.
The completion date is October 15, which is the start of the area's storm season.