Pretty violent little flood. I don’t know about “massive” though. Granted that my point of reference is having lived not all that far from the lower Ohio and / or mid Mississippi River(s) over 55 years.
There is a White Water Canyon above San Fernando also.
The White Water in Palm Springs, looks like the L.A. River. Except a lot less concrete. Switch to "Aerial View", and you will see, its not a river; its a "Wind Farm".
Didn't see any one hanging from the wind mills, but there is probably many politicians that should be.