Rainwater Wall for storage of large volumes of rainwater

In short

The Rainwater Wall (RwW) is a thin, long tank, installed next to a blank wall of a company, industrial site, apartment- or general building. The water stored within the tank can be utilized for cleaning, washing windows and floors and flushing of toilets. It can be used for irrigation,  gardening and can be buffered in the tank to overcome drought periods.

Apart from direct usage of the water, also the energy within the water can be utilized for cooling nearby work spaces and production facilities.

As such, the RwW provides you the opportunity to lower your water– and energy bill substantially and helps saving the environment.

RwW target groups

The RwW concept is most appealing to:

  1. Owners/administrators of estates and buildings, housing cooperatives, production facilities, business premises;
  2. Building advisors, project developers and construction companies; and
  3. Municipalities and Water Authorities.


Applying the RwW helps to substantially reduce:

  1. The water bill because free captured water is utilized for cleaning– and flushing activities;
  2. The energy bill using the collected water as a buffer storing energy for climate control in work- and production locations and for the heating of water.

Dimensions and lifetime

The thickness of the RwW is at least 0,8 meter width, the length is 5-20 meter and the height of the tank ranges up to about 2,4 meter. Storage capacity is up to 100 m³ rainwater per unit, dependent on local conditions, rainfall patterns and the total roof area available.

The structure is modular based using galvanized standard steel segments joint together using an ingenious and proven bolts/nuts system. A strong frame is added to stabilize the construction and a sturdy plastic liner is placed inside the tank resulting in a 100% watertight situation.

The lifetime of the RwW is expected to be 10-15 years.

The RwW flexible set-up 

 RwW’s are dimensioned upon ones needs and can be ordered in different colors and tastes. It also can be decided to place a wooden- or flower fence in front of the RwW to increase the ‘green’ nature of the structure or a local artist could be hired to decorate the RwW.


More information is found here. For questions and quotations, please contact us.