I circled where we live. We have a bayou that separates us from the rest of the neighborhood. Normally, it is a trickle about 5-6 feet wide and a few inches deep. Yesterday it was 10-12 feet deep and 50-60 feet wide. We have "lakes" in all new subdivisions. They are for flood control. They all flooded out of their banks, highest I've ever witnessed.
Normal size of the ponds are about 35 acres of water. They expanded by 100% in the last foot, as they exceeded their banks. I expect we had around 250 acre-feet of water. That is about 80M gallons of water, just in part of our neighborhood. The stream when it was full would have added another 75 acre feet or about 25M gallons of water.
Estimated total for the whole storm was 250 Billion Gallons.
Here is Allison by comparison. That was MUCH more rain.
