Rainwater Tank | The Horizon

The Horizon
  • 256 residential lots
  • 44-storey tower
  • pair of terrace flats formed as townhouses
  • Over 500 residents
  • 7-level carpark for 500 vehicles
  • Outdoor swimming pool
  • Tennis Court
  • Gymnasium
  • Completed in 1998

The Horizon installed a 20,000 litre rainwater tank. Residents use a hand-held hose connection for washing cars, and water is pumped to the gardens for automatic sprinklers & drip irrigation.

Case Study: Rainwater Tank

The Horizon installed a 20,000 litre rainwater tank connected to the existing rain guttering and pipework. Residents use a hand-held hose connection for washing cars, and water is pumped to the gardens for automatic sprinklers & drip irrigation.

Project Overview

Installation of a 20,000 litre rainwater tank in one of the two carwash bays:

  • connected to the existing rain guttering and pipework
  • hand-held hose connection for car washing
  • pumps to garden for automatic sprinklers & drip irrigation
  • Total cost (tank, installation, plumbing, pumps, connections): $12,000

We needed to refresh and rejuvenate our gardens after 18 months of Sydney Water restrictions and to have in place a system that would allow us to water our gardens into the future, notwithstanding any water restrictions that might be in place.

Locating the tank in the car park made sense for us.  The carwash bays were unable to be used legally due to Sydney Water restrictions and so this area was unused.  Also, the carwash bay was right next to the main stormwater pipe, so connecting the plumbing was simple.

Rebates & Incentives

None were available for this project.

Alternatives considered

We considered various sizes and locations for the tank to go. 

After speaking with consultants and our gardeners, we decided that 20,000 litres would meet our needs and would fit in the available car-wash bay, which wasn’t being used any more as a result of Sydney Water‘s restrictions.

Product / Service providers

The installer was knowledgeable about strata matters as well as Council and Sydney Water requirements, particularly for connecting the overflow of the tank back into the stormwater pipes.

Pricing

The total cost was $12,000, paid from the Sinking Fund

Decision-making process

The executive committee made the final decision to proceed.  Everyone on the EC was already very supportive, so no “selling” needed!

By-laws

None were needed for this project.

Relevant Legislation

We needed to comply with Sydney Water requirements for connecting the system, such as installation of non-return valves, etc.  We also needed to have a structural engineer certify the slab in the car park where we were going to install the tank as being able to hold a weight of 20 tonnes.

Results & Savings

It has given us the ability to water the gardens and for residents to wash their cars despite Sydney Water restrictions that would otherwise have prevented this.

Timeframe

The project took 10 months from the outset to final implementation. The most significant delay was getting engineering advice and sign-off by Sydney Water for connecting the tank to the stormwater system.

Other Stakeholder involvement

The strata manager didn’t play a role in this project. The Building Manager did most of the organisational work.

Last Updated: 
Sun 05/08/2012

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