Suggestions Invited For Large-Scale Rainwater Harvesting

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.

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.

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.

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.

Rainwater harvesting now makes financial sense because companies can lock into the Enhanced Capital Allowance Scheme that provides funding for water efficient technologies.
It’s better for industrial machinery because rainwater is kinder than a treated mains supply of ‘harder’ water.

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%.

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.

Rainwater harvesting on a large or commercial scale is beginning to become increasingly important in the UK and the government has included legislation that new builds now have to take into account how they deal with ‘run-off’ water. The Code for Sustainable Homes also actively encourages the fitting of underground water tanks.

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Choosing the best-fit rain water harvesting system depends on topography, land use, land cover, hydrology pattern and demand pattern. The volume of water to be stored is determined using mass balance method, Ripple diagram method, analytical method, and sequent peak algorithm method. Based on various satisfying criteria, analytical hierarchy process is employed to determine the most appropriate type of rain water harvesting method and required number of rain water harvesting structures.