Posted by Eric Berger at 10:58 AM
Nearly three months have come and gone since the Tax Day Floods ravaged the Houston area in April. As you may recall, during these storms rain fell at rates as high as 1 inch in just 5 minutes over parts of Harris County, with a maximum hourly rate of 4.7 inches. The rain topped out at 16.7 inches in just 12 hours over western Harris County. All told, Harris County averaged 7.75″ of rainfall for the event— equivalent to 240 billion gallons of water falling on the area.
One of the most memorable aspects of those floods came when both the Addicks and Barker Reservoirs filled up, and flooded the adjacent Highway 6. These watersheds located upstream of Houston provide flood damage reduction along Buffalo Bayou downstream of the reservoirs and through the center of the city.
A view of the flooded Addicks Reservoir. (John Chandler/Flickr)
Posted by Matt Lanza at 9:00 AM
Note: This is the first in a series of reports by Matt Lanza that puts the Tax Day floods into perspective, and discusses what Houston should learn from this natural disaster.
On Monday afternoon the Harris County Flood Control District released its first official summary of the historic flooding that occurred last week in the greater region. I’ve read through it and compiled some highlights for here. (You can also view the report yourself in its entirety here). A serious thank you to Jeff Lindner at the flood control district who has worked tirelessly since last week to provide critical, useful, and interesting information to put this event into context and keep the region informed. He is also a must-follow on Twitter if you’re into weather, haven’t done so yet.
- Rainfall rates of 1″ in just 5 minutes were observed in Harris County. The maximum hourly rate was 4.7″. The maximum amount in 12 hours was 16.7″
- Harris County averaged 7.75″ of rainfall for the event. That’s equivalent to 240 billion gallons of water falling on the area. This exceeded Memorial Day (162 billion gallons) by almost 80 billion gallons of water. That event was more confined, whereas the Tax Day rains were much larger spatially.
Map of 12 hour rainfall totals. Click to enlarge. (HCFCD)