Results

Except for small delays, the project implementation went smoothly and the original approaches of the three test sections could even be improved in the course of the INADAR project. One of these advances was that it was possible to implement the eco-berms on sediments using geogrids.

INADAR has also received a lot of positive feedback from the competent authorities, even though the approach is time consuming and complex with regard to the current approval procedures.

Although the problem could be solved by a kind of “workaround” in which the permit for the construction of the eco-berm was separated from the construction of the dam raise, in general the simplification of the permitting process remains a goal for the future.

No major problems were encountered in the construction of the eco-berms and it was evident that after the initial gathering of experience, the efficiency and speed of implementation could be significantly improved. It is also expected that in the future the costs of installation can be further reduced by increasing efficiency.

Furthermore, there is no indication that dam stability could pose problems in the future. The regional flora and fauna are gradually colonizing the new habitat and it can be stated that the ecological goals of the project have been fully achieved.

In the past, the project received a lot of attention from various target groups. The events in the region were also a great success and generated a great visitor interest. The regional press regularly reported on the project and it was possible to create a comprehensive network with representatives of similar projects at various levels, ranging from regional to European.

 

Ecology

  • At least 2 ha of valuable habitats for fauna and flora
  • The number of fish species increased from 8 to 17 and the number of individual fishes increased by factor 8 in Offingen
  • 3 endangered species were already found in the new habitats
  • The number of plant species increased by about 25, including some endangered species
  • There was no impact on the existing alluvial forests – 4.000 m2 have been saved

 

Social aspects

  • All stakeholders support the approach –
  • Win-Win-Situation for all parties involved
  • Increased accessibility and quality of the river for recreational activitiess

 

Technology and economy

  • The eco-berms were successfully implemented at a total length of 1 km
  • Dam restoration / elevation and implementation of the “good ecological potential” were accomplished in one working step
  • The eco-berms are proven to be save in terms of dam stability and flood protection
  • Construction costs are significantly lower than in the traditional approach

 

Climate

  • CO2-emissions for transport of materials and concrete production were reduced