The project area includes the Tobia main ditch from the pedestrian bridge on Näituse Street to the property at Jaama Avenue 32, as well as from the outflow of Rahvaaed to the Tobia main ditch. Most of the area consists of a regularly mowed public green space. In the event of a blockage in the outlet pipe of the Rahvaaed ponds, flooding occurs in the surrounding area.

The project area covers several cadastral units. The cadastral units of Näituse Street L1, Vabriku Street L1, Vabriku 16, Vabriku 5, Jaama Avenue L2, and Jaama Avenue 32 are municipally owned. The cadastral unit at Kalda Street 3a is privately owned.

The goal of the project is to reconstruct the outflow of the Rahvaaed ponds in Rakvere and to reduce the nitrate content in the water of the ponds and the Tobia main ditch by using woodchip-based denitrification filters, as well as to improve the city’s flood resilience through the implementation of nature-based solutions. According to the project design, part of the water flow from the Tobia main ditch will be directed through the restored Pond 1 into the designed denitrification reactor No. 1. From there, the water will flow into the designed nature-like ditch 1, which discharges back into the Tobia main ditch (approximately 105 m downstream). The Tobia main ditch will be directed near the boundary between the cadastral units of Vabriku 16 and Kalda 3 into the ponds 2 and 3 located at Kalda 3. The Tobia main ditch and the ponds will be interconnected with nature-like ditches. In stage II, the deteriorated concrete culverts crossing Jaama Avenue will be replaced, and the bed of the Tobia main ditch downstream of the culverts will be partially cleaned.

Part of the Tobia main ditch’s water flows through the Rahvaaed ponds in Rakvere. At the outflow of the ponds, there is a deteriorated regulator with an outlet pipeline that frequently becomes clogged, occasionally causing flooding in the ponds. The project provides a solution for reconstructing the regulator and the outlet pipeline, allowing part of the water to be directed to denitrification reactor No. 2. From there, the water will flow into a designed nature-like ditch, which discharges into the Tobia main ditch. In front of both denitrification reactors, a shut-off valve and a bypass pipeline are designed to regulate flow volume.

For water quality monitoring, three monitoring wells/points and two sampling wells are planned.

Review the construction project documentation via the links below:

Explanatory memorandum for the construction project

Site Plan of the Construction Project