Case study:Austria cross-border section - River widening measure Gosdorf I (Interreg IIIa Project "Maßnahmen Unteres Murtal" 2002-2007)

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Location: 46° 43' 7", 15° 48' 47"
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Project overview

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Status Complete
Project web site http://http://www.unteresmurtal.steiermark.at/
Themes Environmental flows and water resources, Habitat and biodiversity, Hydromorphology
Country Austria, Slovenia
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/Slovenia cross-border section - Interreg IIIa Project "Maßnahmen Unteres Murtal" 2003-2008

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Project summary

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In Gosdorf along a 1,000 m long and 150 m wide stretch, the Mur restored natural riverbed structures such as side-arms, undercut and slip-off slope banks, gravel banks, potholes and fords. Optimal conditions were created for the development of a natural river, bank and alluvial forest areas. The gravel carried in by floodwater stabilises the bed of the river Mur and thus, the ground water level. The construction of a side-arm and the tipping of the excavation material into the river Mur (in total: 150,000 m³) have speeded up the developments described above.

During the construction work threatened species already started to inhabit the new structures: The Nose Carp, a rheophile (current-loving) fish, spawned in the side-arm, Sand Martins were able to utilise an undercut bank for their nesting tunnels while Common Sand Pipers nested on the newly-formed gravel banks. In future also new structures with their typical natural colonisations will be formed again in harmony with the flow conditions of the river Mur, due to the renaturation of extreme and deficient locations. Within the next years, further 750,000 m³ of gravel may be mobilised by dynamic riverbed erosion during higher water flow of the river Mur. Thus, the gravel, which is missing in the cross-border catchment, will be compensated and thereby contribute to the stabilisation of the riverbed and the groundwater balance.

At the location of the river widening an observation tower offers the chance to take a bird´s eye view of the entire restored area at a glance. Step by step, the visitor may range over the individual “storeys” of the alluvial forest.

GerambRose 2010: The measure river widening Gosdorf of the project Interreg IIIa Project "Maßnahmen Unteres Murtal" 2002-2007 was awarded on 17.09.2010 with the GerambRose. The GerambRose is awarded in Styria in appreciation for services that maintain or create high-quality architecture. Neither the owner, the designer nor the performers, but their collective effort, the building, is the focus point of the price. The theme of the GerambRose 2010 was dedicated to the "public spaces". Together with the river widening Weyern (Upper Mur) and Schladming (Enns) a prize was awarded.

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Image gallery


River widening measure Gosdorf I - Aerial View 2008 (Interreg IIIa Project "Maßnahmen Unteres Murtal" 2002-2007) © freiland
River widening measure Gosdorf I - Entrance distributary 2008 (Interreg IIIa Project "Maßnahmen Unteres Murtal" 2002-2007) © 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
Local/regional site designations
Protected species present
Invasive species present
Species of interest
Dominant hydrology
Dominant substrate
River corridor land use
Average bankfull channel width category
Average bankfull channel width (m)
Average bankfull channel depth category
Average bankfull channel depth (m)
Mean discharge category
Mean annual discharge (m3/s)
Average channel gradient category
Average channel gradient
Average unit stream power (W/m2)


Project background

Reach length directly affected (m) 1000
1,000 m
1 km
100,000 cm
Project started 2002/01/01
Works started
Works completed
Project completed 2007/12/31
Total cost category
Total cost (k€)
Benefit to cost ratio
Funding sources

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
Hydromorphology Channel pattern/planform
Biology
Physico-chemical
Other reasons for the project


Measures

Structural measures
Bank/bed modifications Creation of undercut banks, Restoration of the connection of side arms, Creation of Slips, Creation of fords, Creation of potholes, Creation of gravel banks
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
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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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