This plugged screen is from a sprinkler around the clubhouse. These heads have a much finer mesh than those we use on the golf course and plug up daily. The sprinklers on the golf course plug up from time to time and need to be cleaned to prevent dry spots.
We have a separator attached to our irrigation system that is supposed to clean out most of the debris. It seems that during a year like this where the river is a little lower, debris is more prevalent.