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After completing the reconstruction of the rainwater collector on T. Narbuto Street in the bustling capital, the Vilnius Grinda city management company is undertaking an even larger project. On the 500 ha territory, which includes the residential areas of the capital Šeškinė, Pašilaičiai and Fabijoniškės, the rainwater networks will be rebuilt applying the principles of sustainable water management.
In recent years, the intensification of watery rains has caused considerable headaches for urban planners and engineering infrastructure maintenance companies. In the urbanized northern area of the capital, rainwater is collected and discharged into the river Neris without treatment by the main 2 x 1.8 m collector on Geležinio Vilko street. As the hard surface area grows, the loads on this collector increase; already during sudden summer rains it flows up to 30 cubic feet. m / s of collected water flow in the residential areas of Šeškinė, Pašilaičiai and Fabijoniškės. In the future, the currently designed North Street will be connected to this collector, so it is obvious that the collector capacity will not be sufficient soon.
Choose an advanced alternative
There are several ways to solve this problem, each with its own advantages. For example, it is possible to increase the capacity of an existing collector by placing additional pipe nearby. However, this method is extremely expensive and inefficient: the cost of installing high-capacity infrastructure is high and it would only be fully used 3-4 times a year during summer rains. Alternatively, rainwater can be stored in seepage tanks and reservoirs and allowed to absorb into the ground or be discharged into an existing sewer in a controlled flow.
Grinda has chosen an advanced and sustainable form of stormwater management: diverting part of the flow to a storage pond. It would have access to already treated water, and the pond itself and its accesses would be adapted for the rest of the population. This approach is in line with sustainable urbanism and has many benefits.
Groundwater levels (an indicator of the stability of the local ecosystem) are maintained by flooding and gradually injecting rainwater into the ground, rather than instantaneous runoff into surface water bodies, and areas are protected from flooding. Rainwater treatment protects groundwater and surface water from contamination, and orderly rainwater reservoirs and their environment not only help foster biodiversity, but also become a space where people can relax.
Benefits of sustainable water management
- Groundwater levels are maintained by trapping rainwater and gradually injecting it into the ground, rather than by instantaneous runoff into surface water bodies.
- Urbanized urban areas are protected from floods.
- Rainwater treatment protects surface and groundwater from contamination.
- Open rainwater reservoirs and their environment contribute to the promotion of biodiversity.
- The open rainwater tanks become a recreational space.
Pipes are also built underground.
At the intersection of Ukmergės and Šiaurinės streets, it is planned to install a distribution chamber, from which the flow of surface sewage of about 9 m3 / s will be directed by a new pipeline to the storage formed between Ozo and Miglos str. This solution will help regulate water flows, reducing Geležinio Vilko street by almost a third. the maximum loads on the collector. The water from the storage pond will be discharged into a small stream with a new connection to the currently reconstructed T. Narbuto Street. collectors – thus implementing the reconstruction of the Šeškinė – Geležinis Vilkas rainwater networks, the extremely important engineering infrastructure projects of Vilnius will be elegantly connected.
Construction work will include:
- The installation of approximately 1.8 km of DN 2 250 mm surface sewage networks from Šiaurinės and Ukmergės str. intersection to the Ozo str treatment plant
- Approximately 3 cu. m / s capacity for construction of a surface wastewater treatment plant.
- Approximately 20,000 cu ft. M Construction of a recreation-friendly storage facility.
- Installation of surface sewage network of approximately 1.3 km DN 1000 mm in Žvėrynas and connection until 2020. rebuilt T. Narbuto st. collector.
- The total length of pipes of various diameters installed during the project is 3,162 m.
The Šeškinė – Iron Wolf Basin surface sewage reconstruction project is being developed using digital construction tools (BIM). The estimated value of the works is 16.7 million. EUR.
