Rainwater retention

When the outflow of water is restricted on-site, drainage systems need to retain rainwater for a certain period before it’s transported and discharged into sewer networks or other water bodies. With a combination of retention volume and flow control, the temporarily stored water quantities can help prevent surface ponding or flooding.

Challenges of rainwater retention

With the increase in urbanisation and climate changes, retention is increasingly becoming an important consideration for many projects to prevent flooding and property damage. Therefore, the following challenges must be met:

Progressive surface sealing

Due to the increasing development (especially in urban areas), rainwater can no longer directly infiltrate into the ground. As a result, when heavy rainfall events occur, the risk of surface flooding significantly increases.

Increasing heavy rain events

When large volumes of rainwater fall in a short amount of time, sewer networks and drainage systems can reach their capacity limit. This results in flooding and high levels of rainwater that can cause damage.

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Requirements for a retention system

What characteristics should a channel system with retention capacity have to ensure safe and reliable drainage?

High hydraulic capacity: Even during heavy rainfall events, retention systems must be able to store large quantities of rainwater and slowly release it into networks or other water bodies.
Low land consumption: In heavily built-up areas, low land consumption by the retention system is essential. Due to a high retention volume, fewer inlet boxes and pipe connections are necessary.
High load capacity: Depending on the area of application, retention systems must safely withstand load-bearing forces from heavy traffic.
Resilient: The drainage system must have a high resistance to frost, de-icing salts and UV radiation to ensure longevity.
Quick installation & easy maintenance: The retention system must be simple to install and easy to maintain.

Suitable products for rainwater retention

Our systems provide reliable rainwater retention with high hydraulic performance.

Due to their hydraulic performance and high retention volume, RECYFIX HICAP F systems are suitable as retention channels in addition to drainage. This means that large volumes of water can be retained, stored and discharged into the sewer in a controlled manner even during heavy rainfall events.

Loadable up to class F 900
High retention volume: RECYFIX HICAP F 10000, for example, can retain 443 litres per metre
By using RECYFIX HICAP F channels, drain boxes and pipework can be reduced to a minimum – this reduces costs and the time required for installation.

More about RECYFIX HICAP F

In addition to RECYFIX HICAP F, we offer other options for rainwater retention:

Large hydraulic capacity slim line channel RECYFIX MONOTEC
Channels with bigger nominal height, for example, FASERFIX SUPER 500

      
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Load Class

Classes	Areas of application
A 15	Traffic areas without car traffic: footpaths and cycle paths for pedestrians, cyclists, and scooters. Walkers and wheelchair users
B 125	Traffic areas in private areas: driveways, courtyards, terraces, gardens for small and medium-sized cars or SUVs
C 250	Public areas with light traffic and moderate traffic: Parking lots (eg supermarkets), housing developments, parks with small to medium-sized cars or SUVs plus trailers, vans, pickup trucks and light trucks or mobile homes up to 7.5 tons
D 400	Lanes and roads: logistics centres, commercial areas, bus stations, bus terminals, gas stations, truck parking lots with vans and trucks
E 600	Industrial areas with loading and increased dynamics: industrial yards, loading areas for trucks and forklifts
F 900	Areas with extremely high wheel loads and dynamics: airports, ports, container terminals, racing and test tracks with aeroplanes, reach stackers and racing cars

Nominal width | System size

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Areas of application for rainwater retention

Logistics centres & industrial yards

DRAINFIX CLEAN installed for heavy duty drainage to remove pollutants

Public spaces

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Temporary storage of surface water

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Challenges of rainwater retention

Requirements for a retention system

Suitable products for rainwater retention

Our solution – your benefits with RECYFIX HICAP F

Further product possibilities for retention

The HAURATON Product Finder

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