References

Drainage of the S86 route at the Agata junction,
Katowice,
Poland

A polyethylene retention tank will protect a section of the S86 route in Katowice from flooding

A stormwater retention tank made of polyethylene with a capacity of nearly 400 m³ was installed along a section of the S86 expressway near the "Agata Junction" in Katowice in early October 2024. This is part of the road's drainage system, designed to enhance its resilience to climate change and prevent flooding during heavy storms.
The installation of an underground retention tank was one of the tasks in constructing the drainage system for the S86 section near the "Agata Junction" in Katowice, in the Silesian Voivodeship. During heavy rains and storms, massive water pools formed under the overpass and on access roads, often paralyzing traffic for many hours. A technical analysis commissioned by GDDKiA revealed that the existing rainwater pumping stations, along with the inlet and discharge pipelines, were no longer fit for operation due to insufficient capacity and poor technical condition.
The new drainage system is intended to improve the collection of stormwater from this section of the S86 expressway and adjacent commercial areas covering 2.6 hectares, with a total water outflow of approximately 330 liters per second. The investment involves demolishing, reconstructing, and constructing the stormwater drainage network, including the redevelopment of two pumping stations along with associated infrastructure, encompassing road, engineering, water and sewage, sanitary, traction, power, and telecommunications systems.

Place
Katowice, Poland
Completion
2024
Building Type
Transportation
Product system
Storm water

PE retention tank is a key element of the drainage system

The underground PEHD SN8 DN2500 retention tank with a length of 80 meters and a capacity of over 392 m³, together with a new pumping station, is one of the key elements of the drainage system for the "Agata Junction." This is due to the high frequency of stormwater inflow in the area of the road crossing located in a depression beneath the overpass. Once the new drainage system is operational, stormwater — rather than accumulating on the road, forming puddles, and causing traffic paralysis — will flow directly into the tank, which will be emptied continuously.
The drainage system has been designed so that the pumping mechanism ensures a consistent water flow at an optimal rate, preventing excessive inflow into the receiver. From the retention tank, stormwater will be directed to the pumping station tanks and subsequently discharged on two sides into existing DN1000 and DN1200 collectors.
The tank’s construction, installation method, and the course of the installation were dictated by its planned location between the roadway on one side and a slope on the other as well as the high groundwater level. A more than 90-meter trench was excavated using a sheet pile wall technique and secured with temporary steel struts placed between the sheeting walls. To enable the tank’s installation, the subcontractor, Hamer Polska, left two 9-meter “pockets” between the struts. Through these pockets, prefabricated components of the tank, specially prepared at the Uponor factory in Kleszczów, were lowered into the trench and moved into their final positions. The tank components were then extrusion welded by Uponor’s service team.
Despite challenging soil and water conditions and the necessity of performing work adjacent to an active roadway, the installation was completed without disruptions.
 

Flexible and durable polyethylene is the perfect solution for infrastructure

The characteristics of PEHD technology and the production methods of PEHD Uponor pipelines and retention tanks make them exceptionally suitable for infrastructure applications, including water supply and sewage systems. PE products are flexible, durable, and resistant to corrosion, chemicals, and abrasion. The use of extrusion welding for assembly ensures 100% system tightness and the transfer of all axial forces.
As a result, Uponor Infra retention tanks are exceptionally durable and long-lasting, with functionality estimated at over 100 years. They can be installed practicall anywhere, such as alongside or beneath transportation routes, as well as in areas of mining damage.
An additional advantage of this solution is the material homogeneity (pipe/tank and joints), as well as the durability of connections under varying soil pH conditions and the stored medium. Increasingly, customers also appreciate the fact that pipelines and tanks made of polyethylene have a lower environmental footprint throughout the life cycle compared to similar products made of traditional materials like steel or concrete.

Odwodnienie trasy S86 przy węźle Agata

Odwodnienie trasy S86 przy węźle Agata
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