Zielona Góra is a city in western Poland known for its picturesque architecture, vast vineyards and for housing the country’s biggest wine festival. However, a section of the national road DK27 leading to the city has not been sharing its jovial reputation. Forming a busy intersection with a local voivodeship road, the site has had a high accident rate; therefore, a major reconstruction focusing on road safety was started this year. Pipelife Poland supplied Stormbox II crates for an underground infiltration system in the area to ensure uncompromised traffic function during heavy rainfalls.
Boasting one of the fastest-growing economies in the European Union, Poland has a strong focus on developing its transport infrastructure. The country intensively invests in constructing new roads as well as in renovating the existing ones — the National Road Construction Programme 2030 has the funding of almost PLN 300 billion, and the investments will result in nearly 8,000 kilometers of modern roads. One of the projects started this year envisions the modernization of an important junction near Zielona Góra.
The project site is at an intersection used by about 9,000 vehicles daily where a busy main artery meets a local roadway. Limited visibility, speeding and violating priority rules all lead to an increased number of accidents and collisions. To improve traffic safety in the area, the existing intersection will be replaced with a roundabout, and the access roads will be reconstructed. The main goal of the new network is to improve visibility to allow safe entry for vehicles on the connecting road.
Modernizing the existing road drainage system in the area is another crucial part of the reconstruction project. So far, drainage was managed by shallow ditches adjacent to the road. During heavy rain, water would remain in the ditches and even spill back onto the road, increasing the risk of accidents. The existing system had to be completely overhauled to ensure safe driving conditions on the new roundabout.
The area has fine sand and gravel soil with a groundwater depth of 5 meters. With no natural drainage in the vicinity and ground conditions being favorable for the use of infiltration devices, the investor opted for an underground retention system featuring an infiltration tank. Pipelife’s Stormbox II polypropylene boxes were selected as the best solution for the tank, and, once completed, the reservoir will have a capacity of over 150 m3.
The contractor of the investment worth over PLN 7.5 million is the road Company Kontrakt from Krosno Odrzańskie, and currently the works are in full swing. A total of 360 Stormbox II crates, each with dimensions of 1.2 x 0.6 x 0.6 meters, will be used in the two-layer tank construction together with five inspection chambers and an air vent. A layer of geotextile around the crates will allow water to gradually infiltrate back into the soil.
Furthermore, the tank is being installed at the center of the traffic circle to ensure its permanent accessibility. Whenever cleaning or inspection of the tank might be needed in the future, it will be possible to perform the maintenance safely and without interrupting the traffic.
The final water tank dimensions will be 6.0 x 21.6 x 1.2 meters, and the works are scheduled to be completed by the third quarter of 2022. The modern rainwater soakaway system will keep the new roundabout reliably dry, ensuring improved road safety conditions in all weathers.
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