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Re-alignment of the Kolubara River Channel, Phase 1

General Description The Kolubara Coal Basin is located some 50 km southwest of Belgrade. It extends...

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Preliminary Design for the Re-alignment of the Kolubara River Channel, Phase 2

Following the opening of the Veliki Crljeni strip mine, the Coal Extraction Development Strategy for...

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  • Preliminary Design for the Re-alignment of the Kolubara River Channel, Phase 2

    Tuesday, 11 May 2010 17:06
Projects Preliminary Design for the Re-alignment of the Kolubara River Channel, Phase 2
Preliminary Design for the Re-alignment of the Kolubara River Channel, Phase 2 PDF Print E-mail

Following the opening of the Veliki Crljeni strip mine, the Coal Extraction Development Strategy for the Kolubara Coal Basin calls for the initiation of mining operations at Field G (portion of the South Field Strip Mine). One of the pre-requisites for this is the re-alignment of the Kolubara River channel.

Our design project addresses Phase 2 of the re-alignment of the Kolubara River channel and includes all training and control structures and facilities associated with the re-aligned stretch of the river channel.

Phase 2 also includes the re-alignment of a stretch of the Peštan River. The area of the future Field G strip mine currently holds an industrial water supply system, including a water intake, pumping station, and some of the distribution pipelines. These facilities will have to be relocated and new facilities built.

The project also addresses the relocation of the existing „Blue Bridge“ on the Kolubara River and the construction of a new bridge across the Peštan River.

The preliminary design is based on Serbia’s Water Management Master Plan and, as a result, the same level of protection is proposed for both the left and right banks of the future channels of the Kolubara and Peštan rivers. The flood return period design criterion is 1:100 years, including a supplemental control crest elevation for a return period of 1:1000 years.

 

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Figure 1: Site layout

Re-aligned Channel of the Kolubara River:

The total length of the re-aligned stretch of the Kolubara River (Phase 2) will be approximately 2600 m. Most of this stretch (1950 m) will be routed along a site where extraction has ceased. This site is used as an internal disposal site by the Tamnava Strip Mines/East Field. Mullock from the Veliki Crljeni strip mine is currently used to fill the area which will hold a stretch of the future course of the Kolubara River (Phase 2). A special characteristic of this phase is that only one year will pass between the completion of filling and the beginning of construction work.

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Figure 2: Formation of tableland for the Kolubara River channel

The longitudinal gradient of the re-aligned riverbed will be 0.3 ‰. In order to fit the gradient of the new portion of the channel at its upstream and downstream ends, there will be a chute and stilling basin with a useful level difference of 1.6 m.

The typical cross-section of the channel will be trapezoidal:

  • Along the portion of the channel running across the disposal site: riverbed width 24 m and slopes 1:4; dike crest width b’ = 8 m and dike slopes 1:3.
  • Along natural soil: riverbed width 20 m and slopes 1:3; dike crest width b’ = 4 m and dike slopes 1:2.
  • The channel will be waterproofed with a 1.5mm-thick EPDM geomembrane.


Re-alignment of the Peštan River Channel:

The total length of the re-aligned channel of the Peštan River will be approximately 1813 m, with a gradient of 1.0 ‰.

Since several stretches of the Peštan River have already been trained as part of previous projects, its channel will be shortened. This will result in a considerable difference in level relative to the Kolubara River into which the Peštan River empties. The difference in level will be addressed through a chute and stilling basin (useful difference in level 3.3 m).

The typical cross-section of the channel will be trapezoidal:

  • Along the portion of the channel between the mouth and the chute: riverbed width 8 m and slopes 1:3; dike crest width b’ = 4 m and dike slopes 1:2.
  • Along the portion of the channel between the chute and the upstream end integrated into natural soil: riverbed width 8 m and slopes 1:2; dike crest width b’ = 4 m and dike slopes 1:2.

Monitoring

The re-alignment of the Kolubara River channel across an internal disposal site filled with materials of different ages is a highly-complex hydrogeological and civil engineering undertaking, which will require monitoring of both spatial and structural components.

Project documents identify the facilities, measures and procedures needed for:

  • Geodetic surveys of the re-aligned channels of the Kolubara and Peštan rivers, and of the internal disposal site within the zone of the new Kolubara River channel;
  • Monitoring of groundwater levels at observation wells within the zone of the re-aligned channels, and of river stages of the Kolubara and Peštan rivers along their re-aligned stretches. Shallow piezometers will be installed to monitor seepage from the Kolubara channel into the disposal site. In addition, all three aquifers will be monitored (roof, intermediate, and floor).
  • Monitoring of the precipitation regime in the area (daily sums).


Monitoring will be automated, based on a high-accuracy telemetric system.

 

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