Rainwater Harvesting - Commercial, Residential, Agricultural, & Industrial

Rainwater Management Specialists

Our Water Management Specialists and Engineers in Southern Africa brings a creative design approach to the escalating issue of water conservation and water treatment. We develop innovative solutions for rainwater harvesting systems and water treatment plant design. Our company was one of the first large rainwater harvesting companies in South Africa and our one knowledgeable staff have combinedexperience of over 25 years in the water business.

Why work with us?

Our company has a solid track record and have delivered successful projects throughout South Africa

Over the years we have developed extensive experience in selecting effective and reliable equipment for rainwater harvesting and water treatment systems
We have an expert engineering design team. Engineers work on each aspect of the design delivering a 3D model that can be used for procurement and installation
Our expertise and support from our local and global partners have delivered successful projects that are reliable and sustainable
In 2008 Professor Roland Schulze a world expert on water research from UKZN was asked a few questions in the Financial Mail about water security and climate change. Back then he highlighted a few...
Rainwater Harvesting means the immediate collection of rainwater running off a surface upon which it had fallen directly. Falling rainwater can provide one of the purest forms of water that is...
Using rainwater as an alternative water source has many benefits for both domestic and commercial users. Benefits range from improved water quality to reducing water and utility bills
If a rainwater system is designed and installed correctly and if the water is treated correctly it is extremely safe to drink. By implementing our design philosophy and using the correct equipment a...

All you need to know

  • Wisy underground rainwater tank

    Selecting the best rainwater tank

    Rainwater harvesting  tanks can be one of the most expensive components of a rain harvesting system, but it is probably the most important aspect of a successful installation. There are Read More
  • Residential rainwater harvesting system

    Rainwater harvesting calculator - Residential

    We get many questions about how much money will people will save with a rainwater harvesting system. We have built a calculator specific using the Durban Average mean rainfall per Read More
  • WISY 4 step system diagram

    The WISY 4 step rainwater harvesting system

    WISY AG in Germany has over many years developed  a 4 step system for effective rainwater harvesting. These fours steps can be applied in residential, commercial, agricultural and industrial rainwater Read More
  • Critical design elements

    Critical design elements

    Critical design elements for a rainwater harvesting  system If you want to design and build a rainwater harvesting system that will deliver optimum water recovery and add value to the Read More
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Flow diagrams for residential Rainwater Systems


Rainwater harvesting offers an affordable, simple, sustainable, and reliable alternative water source. Not only does rainwater harvesting supply water for indoor and outdoor use, it protects the environment from detrimental non-point source pollution by reducing rooftop runoff.

The water supply in South Africa today is very different than it was 100, 50, or even 25 years ago.

Our population continues to increase, while water supplies remained constant. The amount of water available today is the same amount of water that was available 100 years ago. 

Since water is a finite resource, current and future plans must strive to maintain or improve available water quality while utilizing the available water resources as efficiently as possible.

Since only 2.5% of the worlds water is freshwater, ensuring that this small amount of available water is utilized efficiently and quality is maintained is a daunting task. This is becoming even more important as populations increase worldwide. A recent report by Credit Suisse stated that by 2025, 18 countries will experience water demand beyond supply capabilities.

Worldwide water consumption is rising at double the rate of population growth. Similarly Africas water consumption is continually increasing. Due to the increasing demand for public water supplies, groundwater levels are declining and municipal treatment plants are struggling to supply current demands while dealing with declining infrastructures.

Decentralized rainwater harvesting offers an overlooked alternative and sustainable water source.

Some countries like Australia, Bermuda, Germany, Belgium and India are requiring all new development in certain areas to be equipped with rainwater harvesting systems to preserve declining groundwater supplies. These regulations were made in response to the imbalance of population demand and available water supply.

Some US housing developments are even incorporating rainwater harvesting in their low impact development designs as means to reduce municipal water demand and deter storm water runoff. Furthermore, some municipalities had to restrict or prevented development in areas with insufficient drinking water supplies.

South Africa is considered an arid country and the increase in population is putting increasing demands on water supplies. As a result, planners, state officials, residents, and developers must look at alternative water sources to supply the demands.


Rainwater harvesting is ideal for large retail and industrial buildings, especially ones with expansive parking lots.

End use of water pie chart

An industrial rainwater harvesting design starts with siphonic roof drainage. Rainwater is diverted from the flat roof to either an on-site storage tank(s) or pond. Stored water is then diverted both indoors and outdoors to be recycled for toilet flushing, linen washing, facility cleaning and irrigation. Not only does the company save water consumption costs, but it also reduces storm-water runoff on the site. The storm-water reduction aspect of rainwater harvesting holds this alternative water source above other alternative sources because rather than contributing to pollution through salt discharge (desalination) or energy consumption, it is reducing pollution and protecting local waterways.

Acting proactively to protect the environment and conserve resources is beneficial today and tomorrow.