The excellent "Texas Manual on Rainwater Harvesting" is available for
download from the Texas Water Development Board, www.twdb.state.tx.us , for
free.

wrote:
I read about concrete base but I also read that a sand or pea-gravel base
will work just as well.

I think for flexible tanks, like plastic and fiberglass, a sand or gravel
base is preferable to concrete, but I could be mistaken.

Unless persuaded otherwise, I plan to put a water tank on a 4" bed of
decomposed granite, the kind used for jogging paths in Austin. I order
decomposed granite by the dump truck load he

Collier Materials, Inc.
PO Box 86
Marble Falls, Texas 78654,
Phone: (830) 693-2228
Fax: (830) 798-2226
Toll Free: (877) 603-3030
www.colliermaterials.com

Smaller quantities can be purchase at landscape suppliers.

j jhnsn