Installation Instructions

Site Preparation and Maintenance

Site Preparation 1

1. Ensure the location of the tank is level, stable ground which has uniform compaction (free of soft spots). Do not locate large water tanks close to retaining walls or embankments without first consulting a professional engineer to ensure the ground is capable of supporting the weight of the full tank.

2. Ensure the surface of the site is free from sharp objects or stones and is compacted.

3. Spread a layer (approx. 75-100mm) of metal/crusher dust bedding sand can be used but is prone to erosion — evenly over the level ground, at least 500mm more than the diameter of the tank. Once it is compacted and level you may then place the tank directly on top of this material. To assist with reducing soil erosion, back fill to first rib.

4. Ensure the metal/crusher dust is contained under the tank at all times and cannot be washed away. This can be achieved by diverting all run-off water away from the site and retaining the metal/crusher dust with some form of retaining structure e.g. cement strip, rocks or sleepers.

5. For stand applications, ensure the stand is designed to carry the weight of a full tank. Support slats on the stand should be no further than 20mm apart.

6. For concrete slab applications, the slab must be at least 15cm wider than the base diameter of the tank and at least 15cm thick with 2 layers of F82 mesh 75mm apart and a thickness of 20cm wide and 20cm deep, with Y16 reo bar at the bottom of the thickening around the edge of the slab and a 32 mpa concrete mix. If in doubt of soil stability, you must consult a civil engineer and they will design the slab accordingly.

Site Preparation 2

7. Ensure all plumbing from the outlet is well supported and cannot be knocked (A flexible coupling ensures no strain is applied to the outlet).

8. Ensure all overflows are plumbed away from the tank site to reduce the possibility of erosion.

Your Clark polyethylene tank requires very little maintenance, simply check the site for any erosion and remove leaves and other debris from the roof, inlet and overflow at regular intervals.

Water Tank Plumbing Installation

Here at Northern Rivers Rainwater Tanks, our very own licensed plumbers are happy and willing to provide you with an obligation free quote today!

The Team

Bruce Jobson, head of plumbing at Northern Rivers Rainwater Tanks has over 32 Years experience, in plumbing, roofing and draining. His highly qualified, handpicked and crafted team specialize in a very high quality of work and care.

They are totally dedicated to providing customers with an enjoyable experience from beginning to end. The team have a reputation for not only the highest quality of work and professionalism but also for going to high extremes to satisfy clients requirements. There is no job too big, too small or too hard.

The Installation Process

Site Preparation 3

The first step in the installation process is to prepare a solid foundation on which to place your rainwater tank. This is done by excavating the area until level, and preparing either a concrete, or compacted metal dust base. This is one of the most important steps in the installation process, as a good quality, level base will ensure your tank stays put for many years to come.

Once the tank is placed on the base, the next step is to connect the downpipes. The number of downpipes re-directed to the rainwater tank is dependant on the tank capacity, although it’s always best to connect more rather than less to make the best use of your ability to capture and store this precious, natural resource. There are also various filtration options available at this stage to ensure only the best quality water enters into your tank. These will be discussed with you during your obligation free quote. After the downpipes are connected in, the tank overflow is then connected back into the stormwater system according to council requirements.

The third and last step in the process is getting the water out of your tank to wherever you choose to use it. There are two main methods of doing this, although there are many variations within these two methods.

The two main methods are:
1. Gravity feed system
2. Pressure pump system

Site Preparation 4

Gravity feed system is only suitable for watering gardens in general, unless the tank is located with sufficient vertical height above the fixtures being serviced (i.e. at least 20 metres vertically would be recommended for suitable pressures)

A pressure pump system is exactly as it sounds. A pressure pump is selected to suit the amount of pressure and flow needed for each task, and installed adjacent to the tank wherever possible. It is also necessary to install a pump cover with your pump to protect it from the elements.

After the pump is positioned, pipe work is run to all the fixtures being serviced by the rainwater tank. If the rainwater tank runs low, there are a few options available to ensure that your plumbing fixtures never go without water. These options will be discussed during your obligation free quote.

Finally, the installation is tested for operation, and appropriate signage is placed where necessary.

You are now able to see the sustainable benefits of using rainwater within your household! Enjoy!

Other Works that we do

  • Gutters and downpipes Installation
  • Roof Restoration
  • New Rooves and sheds
  • Shed Erection
  • Full Rain Harvesting Systems design and installation
  • Tank Base Preparation - Concrete, Sand and Tank Stands
  • Excavation and earth works
  • Commercial, Industrial and Residential plumbing services
  • Excavator, Bobcat and Truck hire
  • Drive Ways - Ashpalt and Concrete