Drainage improvements continue in the historic wine region

They are looking for a contractor or contractors to continue the third phase of the rainwater drainage system development in the historic wine region. According to the announcement published in the public procurement notice, this time the city would build a rainwater drainage facility approximately 1,049 metres long. In another partial tender, bids are also being accepted until 17 March for the construction of a 1,800 cubic metre sediment trap and storm water reservoir.

Stormwater threatens roads and houses

The Bodrogkeresztúr road and its surroundings are occasionally affected by rainwater from the mountain, which floods the main road and the houses between the transport corridor and the mountain. To deal with the problem, it was necessary to reconstruct the paved ditch system produced by Első beton Kft., branches 7-0-0, 7-1-0, in the area of State Road No 3838 j. 593, parcels 593 and 1541/1, on the south side of the road, in place of the existing ditch. The culvert will convey water to the existing sewer, which is managed by the municipality, at milepost 6+796 on State Road 3838. The indirect recipient of the catchment is the Bodrog through the above canal.

Controlled discharge of water into the Bodrog

Similar interventions to those mentioned above will also be required for branches 8-0-0, 8-1-0 and 9-0-0, 9-1-0, the latter including the construction of a sediment trap cleaning shaft. The rainwater drained by these structures will be conveyed to the sewer by the culvert of the road 3838 at km 7+309 and km 7+404. The Bodrog is also the indirect recipient of these catchments through the canal system.

The safety of around 1200 residents of the city will also be affected

The total length of the facilities concerned by the improvement identified in sub-task 1 is 1132 metres. The project will provide relief for 1200 residents during major rainfall events.
The tender also specifies that the existing culvert on the Bodrogkeresztúrri road (road 3838 at section 6+804 km) will have to be rebuilt. The Binét ditch used to be part of the ditch system protecting the railway station and was constructed as an artificial channel to protect it from water coming down from the mountain. The latter is owned by the State, managed by MÁV Zrt. and operated by the Municipality of Tokaj.

Reservoir upgrade to tackle water ingresses that threaten railways

In the notice, the contracting authority recalled that so far, two blockages have been caused by water at the crossing at the Binét ditch, and the accumulated rainwater has also stopped rail traffic. However, in the area indicated, the alignment at grade will allow the problem to be addressed by reconstructing the existing slurry reservoir/retention area, which was previously functioning as intended but has silted up over the last decades.
The lower section of the ditch was
improved by the City in 2022-23. The upstream section and the sediment trap reservoir are indirectly received by the Ivély Lake,
managed by the Water Management Directorate of Northern Hungary. The latter has also proposed to restore the facilities.

The loess accumulated in the work area can be used in the vineyard

The design area 2 is defined as the existing undisturbed area and operation of the existing sediment trap (sinkhole) above the railway line.

The plans include the reconstruction of the reservoir basin with a volume of 1,800 cubic metres, and 2 28m3 sediment traps on branch 10-0-0 to support controlled drainage.

On the section above the reservoir between sections 1+797-1+819 and 1+873-1+883, a monolithic ditch lining reconstruction with bed correction is carried out. In addition, between sections 1+883-1+910, the bed of the earth will be corrected.
During the works, the loess accumulated over two decades would be transported to the production area by the Tokaj-Southern Grape Zrt..

The construction of a dam would also protect the railway embankment

The contour of the proposed reservoir would typically be bounded by an earthen berm, as the operator MÁV Zrt. objected to the use of gabion berms. A significant portion of the proposed berm line is rarely waterlogged and is no longer subject to the destructive action of water. However, monolithic concrete trench bank and riprap have been designed in the low water and drift line and in the vicinity of the intake/discharge structures.

A 50-60cm high earthfill embankment would be built along the lower part of the reservoir next to the embankment of the paved railway embankment, so that the retained water level does not directly reach the railway embankment as it does now.

During preliminary discussions, MÁV Zrt. reported water runoff from the 3003 Mountain Dune Road causing flooding at the edge of the V railroad track, and additional paved ditch sections would be added during the project. The latter would be used to collect water run-off from the paved upland ditch. These ditches are planned to be connected to the section of the 10-0-0 branch above the road bridge, which will convey the water to the reservoir basin.

Slowing down the water mass

At the reservoir inlet, the planned sediment trap No. 2 will also dampen the energy of the incoming water mass, after which the gradient of the low-water basin will be 1.4-2 thousandths. The other sediment trap is designed for the lower part of the reservoir bed, the end wall of which is also the water release structure.
A water depth of 0.3-0.5 m can be
created in the reservoir bed. The small water flow will be constantly drained, the water level will be raised and water retention and retardation will be achieved during rainfall. Tenders for the works are invited until 17 March.