Rainwater Infiltration in Darmstadt
Today’s state of the art ensures near-natural management of the rainwater that accumulates. In this sense, decentralized infiltration on site (e.g. with the help of infiltration troughs) is increasingly demanded by the approval authorities.
Why is rainwater infiltration important?
Surfaces such as roofs, paths or roads are impermeable and prevent rainwater from naturally seeping into the ground. Instead, it runs off across the surface and flows into the public drainage system. During heavy rainfall, this can overwhelm the sewer infrastructure, causing backflow or localised flooding. A locally managed rainwater infiltration system helps to relieve pressure on public sewers, reduce flood damage and support the natural water cycle.
Whether using swales, soakaway pits or underground infiltration trenches, professional planning of such systems can protect the property against the effects of heavy rain while contributing to sustainable resource management.
The video (in German) explains the relevance of modern infiltration systems and how various solutions can be effectively implemented.
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What is decentralised rainwater infiltration?
What is a storm drain?
Infiltration trenches can be installed under paved paths and areas accessible by lorries. They can be combined with other techniques, e.g. above-ground depressions (swales).
Amendment of the Water Resources Act
According to the amended German Water Resources Act (WHG), more rainwater is to be infiltrated instead of being drained into the sewage system as was previously the case. According to § 55 para. 2 WHG, the mixing of rainwater and wastewater is to be avoided. In fact, this regulation means the end of the principle of mixed sewerage.
Furthermore, rainwater infiltration systems are increasingly prescribed in development plans. Modern infiltration trenches offer various advantages over classic rainwater infiltration (troughs, gravel):
- High storage and infiltration capacity (only 30% of the gravel volume is required for the same capacity).
- Less land required (less excavation)
- Hardly any restriction on surface usability (in contrast to swale infiltration)
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Questions and answers
Do you still have questions
about Rainwater Infiltration in Darmstadt?
Do I need a permit to install an infiltration trench?
Can I save on fees with an infiltration system?
Yes, in many cities – including Frankfurt – there are reductions or exemptions from the rainwater fee if rainwater seeps away on the property and is not discharged into the sewer system. A certificate from the specialist company is usually a prerequisite.
What is rainwater infiltration?
Rainwater infiltration refers to the targeted discharge of rainwater into the ground in order to relieve the burden on the sewage system and promote the natural water cycle. It is extremely important and is now mandatory in many municipalities, especially for new buildings, conversions and renovations.
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