From a website:
"Good news for those of you who like to get soaked on Kali Rapids, but want to keep some of your items out of harms way.

Disney's Animal Kingdom is about to begin offering complimentary locker rental for two hours for anyone riding Kali Rapids. The new lockers are located just by the restroom near to the Kali main entrance. If you want the full day locker rental, you can still rent those at the front of the park as normal."

This is a great idea I wonder how it's going to work though.