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' 7.14" N, 15° 48' 46.57" E

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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
This is a parent project encompassing the following projects	No

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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

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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

Catchment and subcatchment Select a catchment/subcatchment Site Edit 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 Edit project background Reach length directly affected (m) 10001,000 m <br />1 km <br />100,000 cm <br /> 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 Edit reasons for restoration Mitigation of a pressure Hydromorphology Channel pattern/planform Biology Physico-chemical Other reasons for the project Measures Edit 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 Edit Hydromorphological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Biological quality elements Edit biological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Physico-chemical quality elements Edit 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 Edit Other responses Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Monitoring documents Upload monitoring documents Additional documents and videos Upload additional documents Additional links and references Edit links and references Link Description Supplementary Information Edit Supplementary Information