A simple sump (basically a hole in your basement floor), and sump pump, can help identify it before it reaches your basement floor. IIRC, this is also covered (albeit briefly) in the video.
High water pressure at the basement walls can result in intrusion without ground water below the floor being a problem. I have no sump/drain in my basement as it never floods because it sits on well draining soil. A neighbor's driveway directs water toward my block foundation and, with heavy rains, the localized pressure in the saturated soil along the wall would produce a jet of water coming out of a hole in the mortar. I resolved it by digging a swale that diverted that excess water around the foundation. It is much easier to maintain than a French drain that would silt up rapidly given my soil.
I was thinking more, check for buildup of water upstream of the barrier as an early indication of blockage or restriction. If the gravel or whatever is clogged, you'll see high water behind it.
