That Creek has been overflowing in that specific area for 100 years. My grandfather had a house right across from the school and he constantly had problems with water in his crawl space. There was flooding almost every year so why wasn't the school prepared for this? I seem to recall that there was a flood control project that was going to build a water containment system under the sports fields at Las Lomitas to help prevent this kind of an issue and the school backed out. I guess that was not a good decision.

The school has prepared for it in many ways. In the last round of construction they put a culvert in the parking lot across from the creek to capture water.
The issue is not the school. The issue is with Atherton Public Works. They have never created a way to keep the creek from
overflowing into and across the street. Currently there is an old, broken down “fence” with three openings. It would be quite easy for them to create some kind of wall at the end of the creek to make an actual barrier that would keep this from occurring in the future.
I am a resident in the Walsh Road neighborhood. The second problem that occurred in creating this situation at Las Lomitas, is they no one from Public Works was maintaining the creek. It was full of debris and many many branches, both quite large as well as smaller. This is not allow creek water to flow under Alameda in the opening as it is supposed to do.

The creek becomes a culvert at Alameda, restricting flow and easily blocked by debris coming down the creek. That culvert is underground all the way under Las Lomitas School and the opens up into an open drainage again on the other side (bridge on Camino al Lago)
Pub Works unplugged the culvert/debris and the flood was over.