Hey VV...Nice thread, I also make my own DIY flood and drain tables and thought I would pass this along to you and your subscribers. Instead of lining your table(s) with pond liners or plastic, I have been using a liquid rubber called BlueMax made by
http://www.amesresearch.com/ It goes on easy with a brush or a paint roller and since it is not petro based it is non-toxic to plants and animals. Its a little pricey for just one table @ $150.00 for a 5 gal pail but it works great. I added a few pics of the tables I built using this stuff. Hope this helps someone.