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Surface water treatment

Surface water created by heavy rainfall, melting snow or ice can contain pollutants. Roads, car parks and other surfaces are continually exposed to a variety of pollutants including heavy metals (zinc, lead, copper), microplastics, hydrocarbons, oils and sediment.

Surface run-off can wash these pollutants into natural watercourses and sewer networks, which imposes harm to the environment and our fragile ecosystem. 

How can surface water be treated

To prevent pollutants or harmful substances from entering watercourses, oceans or sewerage, surface water run-off must be treated at the source before it reaches other outlets.

A surface water treatment solution such as a drainage and filtration system can manage surface water, whilst capturing pollutants and improving the overall water quality.

Surface water passes through a filter substrate, which is designed to capture pollutants, allowing purified water to be discharged. The substrate addresses specific pollutants that are present within the particular environment. This can range from heavy metals and oils on industrial yards to rubber granulate on artificial turf.

Characteristics of surface water treatment systems

Loads and forces

As drainage and filtration systems are beneficial for industrial environments, the system must be capable of withstanding traffic loads and patterns in line with the proposed use. This can include anything from extreme heavy loads, high speeds, slow moving traffic, dynamic and lateral forces and transverse movements, etc.

Traffic frequency

As numerous vehicles traffic surface water treatment systems, they must have the capability to cope with continual traffic with varied wheel types and configurations.

Environmental influences

Provide efficient rainwater treatment in environments with local variables such as low and high temperatures, saline conditions, frost and road gritting / de-icing salts

Time and cost-efficient

Installation should be simple and maintenance should to be kept to a minimum, but when required no special tools or machinery are needed.

Continual performance

Efficiently treat surface water run-off even during heavy rainfall.

Compliant to standards

The channel system must comply with environmental regulations and be certified to EN1433:2002

Filter substrate channels for rainwater treatment

DRAINFIX CLEAN - rainwater filtration leaving surface water clear
Water purification with the CARBOTEC 60 filter substrate

The DRAINFIX CLEAN system with a CARBOTEC filter substrate has been specially developed to meet the requirements of rainwater treatment for traffic areas – with outstanding results:

  • Total suspended solids (TSS) 99.5%

  • Total petroleum hydrocarbons (TPHs) 99.9 %

  • Zn (Zinc) 99.8%

  • Cu (Copper) 99.8%

Filter substrate CARBOTEC 60

In order to effectively retain microplastics and micro-rubber from tire abrasion, the CARBOTEC substrate was developed with a specially designed filter resistance. The finest particles are retained right from the start of filtration. This ensures that the cleaning performance works with large connecting surfaces and heavy rainfall.

  • High carbonate content (carbonate reserve for many decades)

  • Precipitation/binding of dissolved heavy metals

  • Retention of very fine particles (0.006 to 0.060 mm)

Image of Andy Beirne - Senior Manager at HAURATON
Your specialist contact for surface treatment

Andy Beirne – Senior Project Manager HAURATON

Product comparison

Treatment of polluted surface water for areas subject to traffic such as car parks, industrial yards, etc.
Rainwater treatment for artificial sports pitches.
Load class according to EN 1433
Load class according to EN 1433 up to F 900 up to B 125
Load frequency
Load frequency
Load dynamics
Load dynamics
Nominal width | System size
Nominal width | System size 200 – 500 100
Materials of the lower parts
Materials of the lower parts Fibre-reinforced concrete or polypropylene (PP) Polypropylene (PP), 100% recycled composite
Frame system
Frame system

Depending on the version with FASERFIX or RECYFIX:
Galvanised steel or cast iron frame with 40 x 40 mm insertion depth

Composite frame 20 x 20 mm with insertion depth

Cover variants
Cover variants

Ductile iron grating

GUGI composite gratings

Special characteristics
Special characteristics
  • Rainwater treatment by surface filtration
  • DIBt approval
  • Proprietary treatment system: CIRIA SuDS Manual C753 chapter 14
  • Rainwater treatment by surface filtration
  • Retains the smallest of microplastics from artificial turf

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Areas of application for rainwater treatment

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Filtration of polluted surface water run-off

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