The rainfall in Texas set a new record for the continental United States, the National Weather Service has said. A rain gauge in Cedar Bayou recorded 132 centimeters .(51.88 inches)of rain from Friday 25 to Wednesday 30 August. Facilities are often built for the "10-year" or 10% storm. Harvey has dropped a much larger amount of rain, comparable to a "500-year" storm. These large deluges are happening every year. Source: vox & vividmaps.com