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How To Install An Underground Water Storage Tank

Underground water storage is an appealing, low-profile solution for your rainwater harvesting system. While more costly and detailed than above ground tank installs, there are many advantages to installing a water storage tank system underground. Keeping your water supply safe from pests, aesthetics, inclimate weather and drastic fluctuations in temperature are just a few of the advantages of an underground water cistern. This article will discuss the basic steps of how to install underground water storage tanks for homes, cabins or lodges.

1. Planning And Preparation for Underground Water Storage

The first step is to decide on the basics of your project. Determining the size and location of your underground water storage tank will help you determine how deep you need to dig and how big of an excavation you will need. This will also help you determine how long of a trench you will need for your water line and where to situate your catchment, plumbing and other facets of your rainwater harvesting system.

It is also important to note that underground water storage systems are less accessible than above-ground storage tanks, making them difficult to add capacity or fix problems that may arise. It is important to understand the pros and cons of installing underground cistern tanks before proceeding.

2. Excavation

The excavation process is the most difficult and costly process for installing a water storage tank system underground. Making sure you dig to the appropriate depth and width is important for many different considerations. We recommend utilizing tanks that come with ground access assemblies as opposed to being buried completely underground. This allows access to the tank for maintenance and troublshooting when necessary.

You will need adequate depth to include backfill around the tank that will prevent it from floating. You will also need to dig a trench for your water lines from the tank area to the pumps and connectors that will bring water into your home — and to the diverter that will bring water into your storage tank. Consideration of the frost line needs to be taken into account as well and precautions should be taken to prevent pipes from freezing if system is going to be used in winter months.

Make sure all literature regarding installation of the tank is read thoroughly and understood prior to beginning excavation.

3. Install The Rainwater Storage Tank

Now that you have your area excavated, you will need to set the tank. Make sure that you have removed any root systems and that you have a level grade. Place bedding into the hole to allow the tank to settle appropriately. The required depth and type of bedding required will depend on the size and weight of your underground water storage tank. After placing and leveling off the bedding, set your tank in the middle of the hole. Backfill the hole and compact it on all sides to prevent floating.

4. Install Connections And Accessories

Plumb and install fittings into your rainwater storage tank. Run all lines and test that your underground water cistern has no leaks or loose connectors. Hooking your system up to an air compressor can test your airtight seals and ensure no future leaks or issues. Be sure to install any storage tank accessories that you would not be able to access later.

5. Fill In The Gaps

Finish filling in the rest of your excavation, making sure to backfill and compact as necessary. You will want to make sure that your underground water storage tank is situated below the frost line if it is being installed in an area with cold winters. Clean up the area as necessary, and make sure that your landscaping is suited to your needs. Make sure to keep any heavy equipment or machinery off of the area above your rainwater storage tank. Continue filling and compacting until you have removed any gaps or spaces around your tank to prevent unwanted moving or settling.

Now you are ready to use your underground water cistern. Storage tanks kept below ground are typically low maintenance with proper installation and will last longer than above-ground systems.

Shop Storage Tanks From Rainwater Management Solutions

RMS has rainwater storage tanks for above-ground and underground projects. We work with many manufacturers of underground water cisterns for many applications and many sizes. Our tank sizing software can help you determine the proper storage tank for you. Browse our selection today to find what you need.

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