National Id
Site name
Danube, Danube Delta
The Babina polder (2.100 ha), in Romania, was reconnected to the Danube in 1994 and recovery has been monitored by the Danube Delta National Institute for Research and Development. Within a few years a redevelopment of the site-specific biodiversity occurred and ecosystem services like nutrient retention and fish recruitment became obvious. Additionally, the reconnected polder enable reed harvesting, grazing, fishing and ecotourism.
Light or indepth?
RBD code
Data provider
Imola Koszta, RECBogdan Barbu, REC
Climate zone
warm temperate moist
Mean rainfall
Mean rainfall unit
Average temperature
Case Study Info
Average slope range
Vegetation class
Monitoring impacts effects
Monitoring parameters
Hydromorphological quality elements (hydrological regime and sediment transport); Biological quality elements (limnological studies conducted in consideration
of phyto- and zooplankton, macrozoobenthos,
phytophile fauna, fish and aquatic
vegetation etc); Physico-chemical quality elements (nutrient retention and transformation); socio-economic (evaluation of the grassland and its usability by the local population;
analysis with regard to a possible use of the agricultural potential for eco-tourism)
Performance impact estimation method
Edge of Field/Plot
Performance impact estimation information
Field measurements; to monitor the area†™s filter function as for the solid matters suspended in the water, water samplings were taken. The limnological samples were taken within the frame of five field studies, together with the studies on terrestrial and aquatic macrophytes as well as
terrestrial and semi-aquatic macroinvertebrates.
The sampling sites of the studied area were determined
in a way to include all types of waters. Evaluation of reed areas available for sustainable use have been identified by means of remote sensing and on-site surveys. Spatial data of
the TM Mapper type have been used for the investigation
Application scale
Field Scale
Installation date
Performance timescale
1 - 4 years
Area (ha)
Area subject to Land use change or Management/Practice change (ha)
Design capacity description
Favourable preconditions
Design contractual arrangement
Arrangement type Responsibility Role Comments Name
Design consultation activity
Activity stage Key issues Name Comments
Design land use change
Land use change type
Design authority
Authority type Role Responsibility Name Comments
The Danube Delta National Institute for Research and Development, Tulcea
subunit of the National Institute for Research and Development for Environmental Protection
The Danube Delta Biosphere Reserve Authority
Public institution, subordinated to the Ministry of Environment and Climate Change
WWF Germany
Key lessons
The restored area is one of the perfect
showcase for the redevelopment and broadening of
natural habitats for fish, birds and further species
that may contribute to the expansion of the Natura
2000 network.
Success factor(s)
Success factor type Success factor role Comments
Successful coordination between authorities
main factor

cooperation between the institutes/irganizations mentioned previously.

Financing type Comments
n.a. info
Barrier type Barrier role Comments
Driver type Driver role Comments
Balancing different objectives
main driver
Ecological reconstruction/restoration
to restore the natural, site-specific hydrological,
biogeochemical and ecological functions, to
ensure the redevelopment of the ecosystem and its
functions and thus to promote the development of
site-specific habitats and their biodiversity. Moreover,
the redevelopment of the natural resources should enable the local populations to proceed to their sustainable, traditional use.
Financing share
Financing share type Share Comments
Policy description
Reconnection of polder Babina, formerly destined
for agricultural purposes, to the flood regime
of the Danube.
Part of wider plan
Policy target
Target purpose
Improved Biodiversity
Pollutants Removal
Runoff control
Oher Societal Benefits
Erosion Control
Policy pressure
Pressure directive Relevant pressure
Policy area
Policy area type Policy area focus Name Comments
Water Policy - Floods Directive
Policy impact
Impact directive Relevant impact
Policy wider plan
Wider plan type Wider plan focus Name Comments
Management master plan for the Danube Delta Biosphere Reserve
Policy requirement directive
Requirement directive Specification
Direct benefits information
New habitats for plants and animals, broader spawning
grounds for fish as well as extended habitats for
aquatic birds, hydrological dynamics and water storage, sediment retention, fixing of toxic substances and an important function as biofilter for the Black Sea.. All these generating remarkable economic benefits. They result in considerable amounts of fish, reed, medicinal plants
Ancillary benefits information
Interesting aquatic landscapes for tourists thus may increase ecotourism in the area.
Costs investment information
n.a. info
Costs operation maintenance
n.a. info
Costs total
Costs total information
n.a. info
Ecosystem improved biodiversity
Information on Ecosystem improved biodiversity
Rich and abundant zooplankton community that provides an excellent food source to fish. the fish fauna of Babina island found its own
level with 29 species. The high diversity of macro- and microhabitats in the terrestrial and semi-aquatic area allow the reactivation of an extremely high biodiversity especially with regard to the arthropode fauna. The species spread along ecological gradients that cover a broad range between arid and moist. The reestablishment of site-characteristic habitats
and food sources has also been to the benefit
of both the European mink (Mustela lutreola) and the European otter (Lutra lutra).
Ecosystem provisioning services
Information on Ecosystem provisioning services
The development and stabilization of the fish
populations involve the use of fish resources and their socio-economic significance for the local populations.
Ecosystem impact climate regulation
No information available
Information on Ecosystem impact climate regulation
n.a. info
Information on retained water
Information on increased water storage
Information on runoff reduction
Ecosystem erosion control
Information on Ecosystem erosion control
At the opening level the sedimentation
of suspended solids formed a layer of 0.60-2.17
m height between 1996-2003. The erosion process is less intense. Solid matters resulting from erosion become sedimentation material for the next and longest part of the canal, where water velocity is low.
Water quality overall improvements
Positive impact-WQ improvement
Information on Water quality overall improvements
A definitely positive effect of nutrient reduction is a reduced eutrophication in the restoration area which is also to the benefit of the Black Sea. Phosphorus arrives in the area with the spring floods and is retained in the reedbeds. In summer time this phosphorus allows the growth of phytoplankton and macrophytes.
Information on Water quality Improvements (N)
229.4 tons of N/year (Total reduction N )
Soil quality overall soil improvements
N/A info
Information on Soil quality overall soil improvements
n.a. info