Large Scale and Commercial Rainwater Harvesting | The Renewable Energy Hub

Large Scale & Commercial Rainwater Harvesting


The technology for large commercial and industrial rainwater harvesting is the same for smaller installations, it’s simply the size and scale that is different.


Commercial Non-Pressurised Rainwater Harvesting System

Image courtesy of Stormwater Ltd

Industrial and Commercial Rainwater Harvesting

The benefits to industry of a good commercial rainwater harvesting scheme are numerous and far reaching. Our industries use a large amount of water for their processes and the installation of an efficient system can help reduce their reliance on a mains supply by between 40 and 50%.

  • It’s better for industrial machinery because rainwater is kinder than a treated mains supply of ‘harder’ water.
  • Most industrial and commercial premises have a large amount of roof space that can easily be converted to improve rainwater harvesting.
  • In the last 20 years, the average water bill for industrial premises has increased by almost 40% which means that significant savings can be made, now and in the future.
  • For commercial rainwater harvesting, larger sites tend to enjoy a quicker return on investment that makes it well worthwhile for industry and substantial commercial developments.

Large rainwater harvester

Rainwater Harvesting Across the World

As we live in a fairly temperate climate, the UK has come a little later to the benefits of rainwater harvesting than some other countries across the world.

  • With little in the way of land resources, Singapore has to make the most of what it gets. The majority of the population live in high rise blocks and many of these have been converted with rainwater harvesting on a grand scale. Individual collection systems are installed on flats to use as potable water.
  • The Ryogoku Kokugikan Arena in Tokyo uses its full 8,000 m² roof to serve a rainwater harvesting system, draining into a massive 1,000 cubic metre tank below the building. Japan has embraced rainwater harvesting technology on a large scale, introducing it to all their main buildings.
  • In Berlin they have gone for a collective approach at the DaimlerChrysler Potsdamer Platz. A combined roof top area of 32,000 m² collects rainwater off 19 buildings to provide potable water from a 3,500 cubic metre tank.

Discover some more international rainwater harvesting projects.

The Future of Rainwater Harvesting in the US

The US industry is beginning to grow, particularly in the commercial arena where the benefits are much greater and the chance of a return on investment over a short period is much more likely than in the domestic market. With increasing demand, we can expect to see more innovation in the rainwater harvesting arena as we attempt to make the most of our dwindling resources.

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