Case study:The Holbina-Dunavat Restoration Project

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Location: 44° 53' 36.01" N, 29° 7' 21.71" E

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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.

Monitoring surveys and results

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Lessons learnt

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Catchment and subcatchment

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(affects all case studies in this 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 m5.0e-4 km <br />50 cm <br />
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

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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)	1212 m <br />0.012 km <br />1,200 cm <br />
Average bankfull channel depth category	0.5 - 2 m
Average bankfull channel depth (m)
Mean discharge category
Mean annual discharge (m3/s)	150150 m³/s <br />150,000 l/s <br />
Average channel gradient category
Average channel gradient	0.015
Average unit stream power (W/m2)	1838.81251,838.813 W/m² <br />

Project background

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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 € <br />
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 € <br />	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

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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

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Structural measures
Bank/bed modifications	Create breaches in the bank
Floodplain / River corridor	Creation of wetlands
Planform / Channel pattern	Connecting Fishpond Holbina-Dunavat to the Danube regime
Other
Non-structural measures
Management interventions
Social measures (incl. engagement)
Other

Monitoring

Hydromorphological quality elements

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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

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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

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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

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

Monitoring documents

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Image gallery

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The entrance in Holbina area (source:www.info-delta.ro)

Dunavat channel (source:www.info-delta.ro)

Additional documents and videos

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The evolution process in Holbina-Dunavat area during restoration works

Additional links and references

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Link	Description

Supplementary Information

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