Sustainable rainwater management – from collection to reuse

Storing and reusing rainwater with tanks: sustainable and smart water management

Rainwater is a valuable natural resource that we often leave unused. In times of increasingly extreme weather conditions – with both heavy showers and long-term droughts – storing and reusing rainwater is not only sustainable, but also economically interesting.

Why reuse rainwater?

• Less burden on the sewage system
  During heavy rainfall, sewers quickly become overloaded. By collecting rainwater in tanks, the peak load is reduced and you help prevent flooding.

• Saving on drinking water
  Collected rainwater is ideally suited for applications that do not require drinking water quality, such as watering green areas, flushing toilets, cleaning vehicles or washing streets.

• Contribution to sustainability
  Reusing rainwater contributes to a circular water management system and reduces the pressure on groundwater reserves.

How does rainwater storage with tanks work?

1. Assylum
   Rainwater is collected via roofs, gutters and drain pipes.

2. Pre-filtration
   Before the water enters the tank, it is filtered from leaves, sand and coarse dirt.

3. Storage
   The purified rainwater is stored in an underground or above-ground water tank – often made of plastic (PE) or concrete. The content varies from a few hundred litres to tens of thousands of litres, depending on the application.

4. Usage
   The stored water is made available for reuse via a pump system, for example in an irrigation system, washing installation or technical application.

Underground vs. Above Ground Tanks

• Underground tanks
  Aesthetically invisible and ideal for lack of space. Often equipped with inspection hatch and accessible connections. Perfect for new construction projects or integration in the infrastructure.

• Above ground tanks
  Faster to install and easier to access for inspection. Often used in industrial installations, agricultural businesses or temporary facilities.

Practical applications

• Petrol stations and car washes : reuse for pre-rinsing or site cleaning

• Industrial estates : buffering of peak discharge during heavy showers

• Public space : water supply for green management

• Residential or commercial buildings : flushing toilets and washing machines

Smart combination with infiltration or delayed drainage

Rainwater storage can be combined with infiltration systems or delayed discharge into the sewer . This creates a robust and future-proof water solution that meets climate goals.

Would you like to know more about the possibilities for rainwater storage?
We are happy to assist you in the design, dimensioning and delivery of rainwater tanks and complete systems – tailored to your situation.

We base the volume of a rainwater tank for a single-family home on the following:

• Roof area < 80 m2; minimum 5,000 l
• Roof area 80 - 120 m2; minimum 7,500 l
• Roof area 120 -200 m2; minimum 10,000 l
• Roof surface > 200 m2; minimum 100 l/m2

Your project, our knowledge.