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' 9.70" N, 14° 34' 47.18" E

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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
This is a parent project encompassing the following projects	No

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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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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

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) Project started 2015/09/01 Works started Works completed Project completed 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 Flood risk management Hydromorphology Biology Physico-chemical Other reasons for the project Measures Edit 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 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