Watching that brought back memories of the first time I visited Palm Springs. We took a guided tour, and the tour guide pointed out an area that appeared to be a concrete "V". He said, "Many tourists and visitors will unknowingly camp or hike in this area. Amateur filmmakers will shoot movies here. And every year, several are injured or killed. This is a culvert that catches snowmelt and rainfall from the mountains. Without ANY WARNING, it can fill to near capacity. People don't realize that the temperature can rise or it can rain in the mountains, and it will take some time for it to reach the culvert. When it does, many times you have no warning and you cannot climb the sides of the culvert fast enough to get out of the way.

Someone said, "I've seen this location in movies!" The guide replied you probably have, but they are professional production companies who get a permit in advance and have to have emergency equipment at the ready.

Thanks for posting this, it was interesting.