Case study:Austria Upper Mur - River widening St. Peter Au (LIFE+ (LIFE+ 08 NAT A 614) Inner-Alpine river basin management – Upper River Mur - murerleben II 2010-2015)

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Location: 47° 12' 10", 14° 34' 47"
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Project overview

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Status Complete
Project web site http://www.murerleben.at/index.asp?pg_nr=60460&lang=en
Themes Environmental flows and water resources, Habitat and biodiversity, Hydromorphology
Country Austria
Main contact forename Jörg
Main contact surname Raderbauer
Main contact user ID User:9984
Contact organisation freiland Environmental Consulting Civil Engineers Ltd.
Contact organisation web site http://www.freiland.at
Partner organisations Office of the Styrian Government - Department 14 Watermanagement, resources and sustainability
Parent multi-site project

Case study:Austria Upper Mur - LIFE+ (LIFE+ 08 NAT A 614) „Inner-Alpine river basin management – Upper River Mur - murerleben II" 2010-2015

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Project summary

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In the St. Peterer Au a side-arm was built in 2004 initially. Due to the flood in September 2005 a 30m long and 60m deep erosion scar arose downstream of the inflow building for the side-arm. In the course of the project "Murerleben I" a large part of the inner arc between the newly created side-arm and the Mur was taken into the public water property. This allowed preserving the natural structures caused by the flood instead of restoring the state before the flood. On the opposite bank, the bank protection was partially removed on 500 m. This facilitates the development of natural waters and shoreline structures also on the left bank. Two reactivated tributaries, 600 m and 200 m long, offer valuable habitats especially for young and standing water fish. On up to 5 ha alluvial forest can develop. Two alluvial basins offer a new habitat for amphibians.

In the follow-up project "muerlerben II" the measure is widened extensively. A few meters upstream a 250 m long side-arm is constructed and a tributary stream is revitalised. Downstream of the existing measure both on the left and on the right bank two side-arms with a total length of 850 m are created. In addition to promoting the dynamic development of the river bed, 4.5 ha of alluvial forest are initiated and 4,000 m² of alluvial basins are created. Thus, the alluvial management Thalheim - St. Peter / Judenburg evolves to a set of measures, which facilitates a structurally rich watercourse of 3.0 km. The entire measure covers an area of around 9.3 ha.

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Image gallery


River widening St. Peter Au - Aerial view 2006 (LIFE+ (LIFE+ 08 NAT A 614) „Inner-Alpine river basin management – Upper River Mur - murerleben II" 2010-2015) ©freiland
River widening St. Peter Au - Distributary 2013 (LIFE+ (LIFE+ 08 NAT A 614) „Inner-Alpine river basin management – Upper River Mur - murerleben II" 2010-2015) ©freiland
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Catchment and subcatchment



Site

Name
WFD water body codes
WFD (national) typology
WFD water body name
Pre-project morphology
Reference morphology
Desired post project morphology
Heavily modified water body
National/international site designation
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Protected species present
Invasive species present
Species of interest
Dominant hydrology
Dominant substrate
River corridor land use
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Mean annual discharge (m3/s)
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Average channel gradient
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Project background

Reach length directly affected (m)
Project started 2015/09/01
Works started
Works completed
Project completed
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Cost for project phases

Phase cost category cost exact (k€) Lead organisation Contact forename Contact surname
Investigation and design
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Post-project management and maintenance
Monitoring



Reasons for river restoration

Mitigation of a pressure Flood risk management
Hydromorphology
Biology
Physico-chemical
Other reasons for the project


Measures

Structural measures
Bank/bed modifications Embankment renaturalization, Restoration of the connection of side arms
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

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Physico-chemical quality elements

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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



Additional documents and videos


Additional links and references

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Supplementary Information

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