Harris County remained under a flash flood warning through at least 12:30 p.m. Sept. 22 as Tropical Storm Beta rainfall continued to saturate the region.
The Harris County Flood Control District lists Brays Bayou as one of several Houston-area bayous "near bankfull" as it continues to monitor flood levels.
The rainfall put one segment of Willow Waterhole at Landsdowne Drive close to flood stage overnight Sept. 21, peaking at an elevation of 54.05 feet around 8:30 p.m, according to the Harris County Flood Warning System. The "flooding likely stage" for that part of the Willow Waterhole Bayou is 54.2 feet.
According to Atlas-14 rainfall tables for the area, 11 inches of rainfall in 24 hours is equivalent to a 25-year rain event. At about 17 inches in 24 hours, it would be considered a 100-year event.