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A - Preparation actions

Action A.1: Elaboration of mathematical hydrological model and calculations 

 


Responsible beneficiary: VVB 

In the past, the inland delta of Danube was one of the largest and most diverse wetland complexes in Central Europe. It's largest parts were destroyed during the last decades. Today, the loss and destruction of biotopes continues as a result of former regulatory interventions into the rivers flow and the lack management of this area.

• As a result of this action mathematical hydrological model of the left-sided branch-system in the area of Dobrohošť and for the "Istragov" area has been elaborated. For the "Istragov" area 1D hydrodynamical numerical model has been elaborated. It was not necessarz to create the model for the whole left-sided branch-system for the implementation of project actions, and it was also not possible to elaborate it in the time and budget available. Mathematical hydrological model and calculation as well as other detailed documentations elaborated within the preparatorz A-Actions were realised only for the localities targeted by the Conservation C - Actions during the project.
Final results include also application of the model to the actions proposed in the section targeted with the model - calculations defining all required technical parameters of hydrotechnical structurers and suitable water regime.

Action was finished in February and March 2010 according the schedule.

Action A.2: Preparation of technical documentation for restoration of Istragov marsh
Responsible beneficiary: VVB

Istragov is one of the largest islands of the inner Danube's delta. It is located in the vicinity of Gabcikovo (47°50´20´´ S, 17°33´18´´ V). Since 1992, this location has been cut off from from water supply, due to technical measures taken during the construction of Gabčíkovo–Nagymaros Waterworks. Based on recovery models of the inland delta of Danube, technical documents as well as detailed project documentation were prepared for the restoration of the Istragov marsh, which is a crucial step for the revitalization of the whole  river system near Istragov.

All planned outputs - technical documentation for restoration of Istragov marsh and obtaining of construction permit and all necessary permissions according to Act No 543/2002 on Nature and Landscape Protection were achieved and provided but the action was delayed 5 months in comparison with the original timetable.
Recent status:
Action finished.

Action A.3: Preparation of technical documentation for restoration of Dunajské kriviny river branch system 
Responsible beneficiary: VVB

The area of Dunajské Kriviny is located near the village Dobrohošť (47 ° 59'18'' N, 17 ° 20'46'' V). It is a area of european importance with a environmental protection level 2. The native river branches and channels are completely dried up, because the existing flooding station of the hydroelectric power plant Dobrohošť is not connected to this area. Dunajské Kriviny does not even receive water during artificial floodings since the river arms are clogged with sediments. Based on the hydrodynamic and mathematical models of the Danube river system, technical documents as well as detailed project documentation were prepared for the revitalization of Dunajské Kriviny by building a channel that would reintroduce water to this area.

• Expected results were fully archieved. Technical documentation was finished by 09/2010, 6 months later in comparison to time schedule. In addition, supplement to technical documentation was completed on 2nd November 2011. All the permissions acquired for the first technical documentation were valid also for its supplement, because it was not a major change in technical documentation, however for technical reason the change was necessary.

Delay was caused by the long-lasting public procurement process, which took more than 3 months.
Recent status:
Action finished.


Action A.4: Preparation of technical documentation for construction of the fishway on two strategic points in river branch system 
  


Responsible beneficiary: VVB

An ichthyological study is necessary to define the ecological and technical requirements of different species of fish, which are going to use the fishway for migration. Strategic locations for the construction of the  fishway were chosen in order to maximize its positive effects. There are two options in place a fishway or a biocorridor. The design was inspired by a already functioning fishway in Hungary.

• The first ichthyologic study was completed in December 2009 by an external provider - Slovak Technical University. Different technical constructions of the fishways were presented in this first stury, but regarding to consultations with experts it was concluded that such technical objects are rather not working in conditions of lowland rivers and their fish fauna and thus it was decided to elaborate supplemnet of this study. The supplemnet was prepared by external supplier AQ-BIOS and it was finished on 29th November 2010. Finally, as consensus of all experts and institutions, construction of fishway within Bakanské ramená river branch was selected and proposed. Another potential place proposed by supplement of the ichthyologic study was the Veľkolélske rameno river branch system. 

Fishway I - Bakanske rameno river branch

Consequently to new ichthyologic study supplement, technical documentation was elaborated during 2011. In connection with preparing of documentation a few work meetings and meetings with stakeholders were realised in the office and also in the field. The last official negotiation, where the technical domcumentation was approved, was held on 28th July 2011 and all the documentation was completed and finished in August 2011. The process of issuing of the construction permit was slowed by comments of Slovak Fisherman Association (SRZ), which were expressed just through the last phase before the construction permit wsa isued. In this context several meetings were held and some of the comments have been incorporated to technical doumentation. These changes tok several months, and the final agreement was reached on 9th October 2012. After that new permits ad to be issued. During new permission prosess construction permit was issued on 10th February 2014 (District office of Dunajská Streda). At the same time public procurement was ongoing, in which 7 companies were involved. It was finished in December 2013. The contract with the company which ofer the lowest price during electronic auction (Eurobia SK) was signed on 12th February 2014.

Fishway II - Veľkolélske rameno river branch

Veľkolélske rameno river branch system was next potential place proposed by the supplement of ichthyologic study as fishway. After permission from EC about possibility of realisation second fishway on the Veľkolélske rameno river branch (which is an importatnt fish habitat, that time disconnected from direc contact with the Danbe river), VVB started with feodetic survey and consequently with technical documentation. This restoration will allow fish migration from Danube to Vľkolélske rameno, where they can find suitable spawnin habitats. The last oficial negotiation, where the technical documentation was approved, was held on 30th January 2012 and all the documentation was copleted an finished by February 2012. Analysis of sediments from te Veľkolélske rameno river branch have been ordered and realised. This was necessary for finding out how the sediments dredged out from the river branch should be treated - as inert material or hazardous waste. The results of the analysis werer positive, amount of heavy metals and other of substatnces included in sediments are within allowed limits for free deposition on the soil. This analysis has been an important last step prior to public procurement. Without this it was not possible do decide whether the sediments can be freely deposited in adjacent area or they have to be transported and dumped on special landfill and it was not possible to estimated budged for it..
After elaboration of technical documentation, the process for obtaining of the construction permit started. The construction permit was issued together for the action C.3 and C.6 on 8th April 2013. 
Recent status:
Action finished.

Action A.5: Preparation of expert study and technical documentation for restoration of Medvedovske and Velkolelske rameno river branch systems 
Responsible beneficiary: Agravia/BROZ

After a detailed field survey was finished, a study has been prepared, which elaborated on a possible restoration effort and its ecological, technical and legal limits. On the basis of this study a technichal documentation for the restoration of the river arms Medveďovské rameno and Veľkolélske rameno has been prepared.

Expert study for restoration of Medveďovské rameno river branch system was elaborated in 04/2010.
Technical documentation of Medveďovské rameno river branch system was elaborated in 11/2011.

Construction permit for restoration of Medveďovské rameno river branch system was issued in March 2012.

The expert study for restoration of Veľkolélske rameno river branch system was completed in 02/2010.

Technical documentation for restoration of Veľkolélske rameno river branc system was completed in December 2010, acoording original time schedule.
Updated and more detailed technical documentation ofr restoration of Veľkolélske rameno river branch system was completed in 01/2012.
Construction permit for restoration of the Veľkolélske rameno river branch system was issued in April 2013 and was updated including the bridge on 4th April 2014. The same construction permit included actions C.3 and C.6 at the Veľkolélske rameno river branch system.
Technical documentation for the construction of the bridge elaborated and approved.
Recent status:
Action finished.

Action A.6: Elaboration of expert study on restoration of lowland meadows bird habitats by grazing 
   
Responsible beneficiary: BROZ

The traditional use of meadows and grasslands, which are an important habitat for many bird species, were virtually abandoned. Currently there is little or no experience with the recovery of alluvial meadows by regulating the intensity of grazing, rotation of animals etc. Suitable locations for the recovery of meadows have been chosen as well as

External company elaborated the expert study with proposals for lowland meadows restoration by grazing, including maps. The study consists of specific chapters and annex with maps. First part is focused on general description of the natural conditions within the project area and especially on grassland habitats. Next chapters specified proposed natural management and restoration of grasslands as well as summary of various methods of grasslands management – mowing and grazing with explanation of benefits and advantages for each one. Ownership statuses of potential areas for lowland meadows restoration have been also surveyed. 
Recent status:
Action finished.

 Action A.7: Elaboration of expert study on planting of native trees to create refuges and nesting places for endangered bird species 

  


Responsible beneficiary: Agravia

Our native species of trees provide a versatile area for nesting, hunting and resting for a large number of bird species. By switching to a monocultural forest management and with the plantation of cultivated species of trees, in case of Danube wetlands the Canadian poplar tree, there was a significant loss of suitable habitat for many animals including birds. The study therefore includes locations and suggestions for planting native species of trees, to create a suitable living condition for specific bird species.

External company elaborated the expert study for planting of native trees to create refuges and nesting places for endangered bird species by 31/10/2009. The study is including locations and proposals for native trees planting and measuring the possible effect of various alternatives on the target bird species. The first planting of trees according to this study has been realised already in 2009.
Recent status:
Action finished.

 

Action A.8: Preparation of technical documentation for restoration of Szárazerdei river branch and restoration of wetlands in Ásványi river branch system 
Responsible beneficiary: EDUKOVIZIG
• Two sets of updated technical project documentations elaborated for restoration of Szárazerdei river branch and restoration of wetlands in the Ásványi river branch system. EIA process carried out. Documentation for obtaining construction permit submitted to competent building authorities and approved.
Action was slightly delayed, due to problems with the bank guarantee at the beginning of the project. Action preparation started after signing the contract in June 2009. It was not necessary to apply the EIA process for these restoration actions.
Szárazerdei technical documentation was completed on 20/12/2009, 2 months, 20 days later.
Ásványi technical documentation was completed 20/12/2009, 10 days ahead according the time schedule
Recent status:
Action finished.