For some reason I was under the impression the deep ditches found in and around Houston were dug for flood control. I know we had a very deep ditch near our subdivision that usually was either dry or had a very small stream. (easily jumped across by a 10 year old)
Prayers up for all in the path of the terrible storm.
The Houston area is very flat. There are lots of deep drainage ditches to help prevent flooding.
They live next to the Brazos River south of Houston. It is a little bigger than a ditch..