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
  • 1
  • 2
  • 3

Flow diagrams for residential Rainwater Systems

A primary rainwater filter installation

Although various forms of rainwater harvesting have been used for thousands of years, as an organized industry, it is still in its infancy. At present, no national standards are in place regulating its use. The onus is thus on the installer to ensure that the installed system complies with similar regulations. Whatever kind of systems is considered - rainwater harvesting is not just a pipe running off a roof into tank.

It requires an insight into water and water management as well as effective engineering design. For the homeowner it is important that they research their options. No formal training courses are available but a lot of information can be found on the internet. The installation however requires effective design in order to have a lasting impact as well a a low maintenance cost.

There are a variety of methods of collecting rainwater—tanks, above-ground or underground, and other collection devices. Harvested rainwater is frequently used for irrigation, but can also be a source of water for flushing toilets, washing vehicles, and, in some cases, for drinking water.

Installed rainwater harvesting systems offer a reasonable return on investment especially with the recent increase in the price of water. Water price increase have ranged from 9.5% for home users to 12.5% for industry in 2015. Rainwater systems  can offer a financial payback for homeowners. However the real benefit is the fact that the homeowner has created an  independent source of supply with a far superior water quality than that from a waterworks.The return on investment is better on residential systems as they do not use as much water as industry and their net unit cost per kiloliter of water is higher than industry

Commercial systems with big water recovery surfaces has to focus more on storm-water management and retention and the a rainwater harvesting system becomes an added benefit With commercial systems like laundries and factories  70 to 80% of  water use is non-potable so highly treated water is not required thus it is predictable that  decentralized water systems are going to be the trend of the future.

Rainwater harvesting systems can significantly reduce storm-water runoff which is a major benefit to low lying coastal cities that get high volume of rain in summer .

Rainwater systems can also be applied for irrigation. Here it is about storm-water control and re-using the water for irrigation systems. Though simplistic it plays a key part in storm water runoff management

For potable systems it is key to effectively design the system and integrate it into the building design. The roof surface determines how much water is collected. The quality of the roof runoff as well as the primary rainwater filters play a big role in the water quality that is store in the tanks. Integrating it into the water supply require some form of sanitation and disinfection. Backflow control is also critical.

For some people, having a private, protected source of water is a motivation for installing rainwater harvesting systems.

In countries like India a lot of rainwater harvesting is done and the recovered water is directed to underground pit to replenish wells with water so it can be used in the dry months again. It these systems primary rainwater filtration is critical to remove above ground debris and organic material to minimize contamination of the underground resource. The infiltration process into the soil is a natural filtration process  and the dark cold environment over time with microbiological activity kill off bacteria and make the water drinkable over time.

In arid regions rainwater harvesting requires a different design. Because you want to recover as much rain as possible when it rains the recovery surface must be very big. At the same time the water storage area must have a great capacity to store this water so that it can be used during periods of no rain. Even in this scenario there are many benefits but again a good insight and design is required.