Rainwater Infiltration in Mainz

Installation and maintenance of infiltration trenches
Rainwater infiltration in Mainz

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The consequences of land sealing are making themselves felt across Germany through increased prices for drinking water and wastewater, as well as damage caused by floods. The topic of rainwater infiltration is particularly relevant for many new building projects, conversions, and renovations.

Modern techniques now allow for the near-natural management of rainwater accumulation. Decentralized infiltration on site, such as through the use of infiltration troughs, is increasingly being requested by regulatory authorities.

Rainwater infiltration in Mainz

Why is rainwater infiltration important?

Roofs, paths, and streets prevent rainwater from seeping into the ground. Instead, it flows over the surface into the sewer system. During heavy rainfall, this can overwhelm drainage systems and lead to backflow or flooding. Local rainwater infiltration helps relieve public sewers, prevents flood damage, and preserves the natural water cycle.

Whether through swales, infiltration shafts, or underground soakaway systems, professional planning of these systems protects your property from the effects of heavy rain while contributing to resource conservation.

In the video, you can learn more about the relevance of modern infiltration systems and how various solutions can be effectively implemented.

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What is decentralised rainwater infiltration?

When rainwater that has not been polluted with harmful substances infiltrates directly onto the property, this is referred to as “decentralised rainwater infiltration”. The technical issues in this context are regulated by the DWA-A 138 worksheet.
What is decentralised rainwater infiltration?
What is a soakaway (Rigole)?

What is a storm drain?

An infiltration trench is an underground trench in which rainwater can infiltrate. Infiltration trenches are mainly planned because of limited space and the relatively simple realisation.

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

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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 Mainz?

Do I need a permit to install an infiltration trench?
Yes, as a rule, approval must be obtained from the responsible lower water and soil protection authority. A soil permeability test (e.g. using a seepage test) and proof of infiltration in accordance with DWA-A 138 are also often required. We will be happy to help you with the application and professional planning.
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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