Case study:Creation of spawning ground for Baltic salmon, anadromous brown trout and river lamprey at Veneküla rapid, river Pirita

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Location: 59° 26' 4", 24° 55' 51"
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Project overview

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Status Complete
Project web site
Themes Economic aspects, Fisheries, Habitat and biodiversity, Hydromorphology, Monitoring
Country Estonia
Main contact forename Martin
Main contact surname Kesler
Main contact user ID
Contact organisation Estonian Marine Institute, University of Tartu
Contact organisation web site http://www.sea.ee
Partner organisations
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Project summary

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Works included: Breaking the bedrock (>100m3), placing spawning gavel (>110 m3) to the created pool and placing large boulders around the created spawning ground to provide shelter for the fish.

Monitoring surveys and results

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Lessons learnt

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Image gallery


Groundbreaking work in process
Excavating the pool from excess rock
Gravel emplacement
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Catchment and subcatchment



Site

Name Veneküla rapid
WFD water body codes
WFD (national) typology
WFD water body name River Pirita
Pre-project morphology Limestone bedrock
Reference morphology
Desired post project morphology
Heavily modified water body No
National/international site designation Estonia - Koelmuala
Local/regional site designations
Protected species present Yes
Invasive species present No
Species of interest Baltic salmon (Salmo salar), anadromous brown trout (Salmo trutta) and river lamprey (Lampetra planeri)
Dominant hydrology Riverine
Dominant substrate Flat monolithic bedrock
River corridor land use Urban
Average bankfull channel width category 10 - 50 m
Average bankfull channel width (m)
Average bankfull channel depth category Less than 0.5 m
Average bankfull channel depth (m)
Mean discharge category 1 - 10 m³/s
Mean annual discharge (m3/s) 5-7
"-7" is not declared as a valid unit of measurement for this property.
Average channel gradient category 0.01 - 0.1
Average channel gradient 0,72
",72" can not be assigned to a declared number type with value 0.
Average unit stream power (W/m2)


Project background

Reach length directly affected (m) 2000
2,000 m
2 km
200,000 cm
Project started 2007
Works started 2012/07/15
Works completed 2012/08/30
Project completed 2013/09/30
Total cost category 10 - 50 k€
Total cost (k€)
Benefit to cost ratio
Funding sources 90% covered by EU, Central Baltic INTERREG IV A Programme 2007-2013 and 10% by Estonian Ministry of the Environment

Cost for project phases

Phase cost category cost exact (k€) Lead organisation Contact forename Contact surname
Investigation and design
Stakeholder engagement and communication
Works and works supervision
Post-project management and maintenance
Monitoring



Reasons for river restoration

Mitigation of a pressure Drinking water storage and supply
Hydromorphology Substrate conditions
Biology Fish: Abundance
Physico-chemical
Other reasons for the project


Measures

Structural measures
Bank/bed modifications Excavation of bedrock, Introduction of spawning gravels, Creation of pools, Creation of fish refuge areas
Floodplain / River corridor
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

Biological quality elements

Element When monitored Type of monitoring Control site used Result
Before measures After measures Qualitative Quantitative
Fish: Abundance Yes Yes Yes Yes Yes Improvement

Physico-chemical quality elements

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

Any other monitoring, e.g. social, economic

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


Monitoring documents



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Additional links and references

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Supplementary Information

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