http://www3.gendisasters.com/missouri/13492/kansas-city-mo-flash-flooding-sep-1977 ↗
I'd say the Plaza Flood and the San Marcos-Wimberlie flood were very similar. 12" of rain in a very short time. Unfortunate loss of lives and property.
Houston is so flat we seldom get fast moving water unless you are in a bayou or creek with high water. There is a lot of property damage but not fast moving water that tears down everything in its path.