Case study:The Holbina-Dunavat Restoration Project

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Location: 44° 53' 36", 29° 7' 22"
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Project overview

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Status Complete
Project web site
Themes
Country Romania
Main contact forename Marian
Main contact surname Tudor
Main contact user ID
Contact organisation The Danube Delta Biosphere Reserve Authority
Contact organisation web site http://www.ddbra.ro
Partner organisations
Parent multi-site project
This is a parent project
encompassing the following
projects
No
Holbina area (source: www.info-delta.ro)

Project summary

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Holbina-Dunavat area (S=5630 ha) has been studied from 1994 in order to establish a strategy for ecological restoration by a reintegration of the fish farm basins with the surrounding wetlands by opening the ring dikes around the basins. The positive effects are both ecological (wetland restoration, natural habitat and breeding area for fish and aquatic birds) and socio-economical (development of traditional activities, fishing, livestock and reed harvesting, creation of recreational areas for ecotourism) for the local people.

Works included: Connecting Fishpond Holbina-Dunavat to the Danube regime.

Monitoring surveys and results

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Lessons learnt

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Image gallery


The entrance in Holbina area (source:www.info-delta.ro)
Dunavat channel (source:www.info-delta.ro)
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Catchment and subcatchment

Catchment

River basin district Danube
River basin Danube

Subcatchment

River name Sf. Gheorghe Branch
Area category more than 10000 km²
Area (km2)
Maximum altitude category Less than 100 m
Maximum altitude (m) 0.5 m
5.0e-4 km
50 cm
Dominant geology Organic (i.e. Peat)
Ecoregion Pontic Province
Dominant land cover Wetland
Waterbody ID



Other case studies in this subcatchment: Ecological reconstruction of islands resulted after Sf. Gheorghe Arm rectification - project 1, Ecological reconstruction of islands resulted after Sf. Gheorghe Arm rectification - project 2, Ecological reconstruction of islands resulted after Sf. Gheorghe Arm rectification - project 3


Site

Name Fishpond Holbina-Dunavat
WFD water body codes RORW14.1_B7
WFD (national) typology RO15
WFD water body name
Pre-project morphology Sinuous, Fish ponds, Artificial channel
Reference morphology Sinuous
Desired post project morphology
Heavily modified water body No
National/international site designation International - RAMSAR site
Local/regional site designations Biosphere Reserves
Protected species present No
Invasive species present No
Species of interest
Dominant hydrology Artificially regulated, Floodplain area
Dominant substrate Peat, Sand
River corridor land use Wetland
Average bankfull channel width category 10 - 50 m
Average bankfull channel width (m) 12
12 m
0.012 km
1,200 cm
Average bankfull channel depth category 0.5 - 2 m
Average bankfull channel depth (m)
Mean discharge category
Mean annual discharge (m3/s) 150
150 m³/s
150,000 l/s
Average channel gradient category
Average channel gradient 0.015
Average unit stream power (W/m2) 1838.8125
1,838.813 W/m²


Project background

Reach length directly affected (m)
Project started 1993/01/01
Works started 2003/01/01
Works completed 2004/01/01
Project completed
Total cost category more than 10000 k€
Total cost (k€) 2000000 k€
2,000,000,000 €
Benefit to cost ratio
Funding sources MAPM-ARBDD, National budget, 2000000

Cost for project phases

Phase cost category cost exact (k€) Lead organisation Contact forename Contact surname
Investigation and design more than 10000 k€ 130000 k€
130,000,000 €
The Danube Delta National Institute for Research and Development, Tulcea Marian Tudor
Stakeholder engagement and communication The Danube Delta Biosphere Reserve Authority, Tulcea Marian Tudor
Works and works supervision
Post-project management and maintenance The Danube Delta Biosphere reserve
Monitoring The Danube Delta National Institute for Research and Development, Tulcea (office@indd.tim.ro) Marian Tudor



Reasons for river restoration

Mitigation of a pressure Flood risk management
Hydromorphology Quantity & dynamics of flow, Continuity for organisms, Width & depth variation
Biology Fish, Macrophytes, Phytoplankton
Physico-chemical Nutrient concentrations
Other reasons for the project Landscape enhancement, Reintegration of the fish farm basins with the surrounding wetlands, Biofilter for the Danube, Razim and Black Sea


Measures

Structural measures
Bank/bed modifications Create breaches in the bank
Floodplain / River corridor Creation of wetland
Planform / Channel pattern
Other
Non-structural measures
Management interventions
Social measures (incl. engagement)
Other


Monitoring

Hydromorphological quality elements

Element When monitored Type of monitoring Control site used Result
Before measures After measures Qualitative Quantitative
Quantity & dynamics of flow Improvement
Continuity of sediment transport

Biological quality elements

Element When monitored Type of monitoring Control site used Result
Before measures After measures Qualitative Quantitative
Fish Improvement
Invertebrates
Macrophytes
Phytoplankton
Zooplancton

Physico-chemical quality elements

Element When monitored Type of monitoring Control site used Result
Before measures After measures Qualitative Quantitative
Nutrient concentrations Improvement
Salinity
pH
Oxygen balance
Temperature

Any other monitoring, e.g. social, economic

Element When monitored Type of monitoring Control site used Result
Before measures After measures Qualitative Quantitative
fish resources Improvement


Monitoring documents



Additional documents and videos


Additional links and references

Link Description
http://www.ddbra.ro The website of the Danube Delta Biosphere Reserve Authority

Supplementary Information

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