Often the ideal water tank for a particular application is just a little too tall and the question of partially burying them arises.
Most manufacturer’s will recommend that their tank not be buried. Some manufacturer’s will agree to their tanks being partly buried as long as very specific guidelines are followed. So you need to discuss the particular tank with your Rainwater Tank’s Direct consultant to see if it is able to be partly buried.
We have set out below the requirements specified by one of our suppliers, National Poly Industries, if one of their tanks is to be partly buried.
NOTE: The following instructions are a guide only. We advise that you seek an Engineers advice for your particular situation before attempting any of the following. Incorrect installation will result in Warranties being made void.
BURYING NATIONAL POLY INDUSTRIES RAINWATER TANKS (GUIDE ONLY)
- YOU MUST SEEK AN ENGINEERS ADVICE REGARDING YOUR PARTICULAR SITUATION.
- As a guide only we recommend that you do not bury your tank anymore than 1 metre into the ground.
- You must dig your hole 300mm (12”) wider than the base diameter of your tank. If two tanks are to be buried side by side then separate holes must be dug.
- Prepare tank base as per our INSTALLATION AND TANK BASE PREPARATION REQUIREMENTS.
- Completely fill tank with water first then backfill the hole with compacted cracker dust and cement powder. Compact 75-100mm (3-4”) at a time. We also suggest that you erect a fence for safety reasons around the tank. Backfill Ratio = 3 parts cracker dust to 1 part cement powder