There are many reason to build a custom pond outside of your home here in Texas. We found a couple of articles that will give you more reasons why:
Holman Services and CTSB work together and here are some pics of a recent pond job done by them. They specialize in bentonite seals at the bottom so that they are less likely to leak. Texas subsoils can allow rapid loss of water by seepage from any pond, lake, or reservoir. Ponds and lakes on such soils often may be improved by the use of bentonite as the bottom seal to reduce seepage losses. Bentonite is a natural clay which has the characteristic of swelling 10-12 times its dry size when it becomes wet. When bentonite is applied in a layer over porous soil, or mixed with a porous soil, and then moistened with water, it forms an impermeable layer.