Case study:Rio Mareta restoration at Stanghe (Sterzing-Vipiteno)

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Location: 46° 53' 4.17" N, 11° 23' 2.02" E

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Project overview

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Status	In progress
Project web site
Themes	Flood risk management, Habitat and biodiversity, Hydromorphology
Country	Italy
Main contact forename	Peter
Main contact surname	Hecher
Main contact user ID
Contact organisation	Provincia Autonoma di Bolzano
Contact organisation web site
Partner organisations
Parent multi-site project
This is a parent project encompassing the following projects	No

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Project summary

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The Mareta River drains a catchement area of 212 Km and flows into the Isarco River, near Sterzing (Vipiteno). In the last 150 years, the river was object of various intervention; the two major consist of a flow regulation in 1876 and a large aggregates extraction, to provide material for the construction of the Brennero motorway, in the early 70’s. These activities caused a significant incision and narrowing of the riverbed (from the large original braided river bed – up to 300 m width – to a channel 30-40 m wide). The areas of natural retention, such as flood plains and riparian areas, have almost completely disappeared, making floods more intense in the Vipiteno basin. Using public lands has been possible to enlarge the riverbed up to twice the width set in the 70’s, along a stretch of 2 km, The material of the excavations has been deposited in the river bed, taking care to reproduce forms as natural as possible. To restore the longitudinal continuity, 16 dams has been demolished, with benefits to the ecosystem and fish populations for the morphological evolution of the stream itself, which is to be returned as a dynamic system . To ensure flood safety the new bed was consolidated by bank protections, covered with loose material and harmonized with the surrounding landscape.

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Image gallery

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Rio Mareta in 2005, before restoration works.

Rio Mareta in 2010, after restoration works.

Rio Mareta in 2012.

The rio Mareta restoration works: a dam removal (left) and riverdeb consolidation (right).

The Rio mareta new bed was consolidated by stones, covered with loose material.

Catchment and subcatchment Select a catchment/subcatchment Edit the catchment and subcatchment details (affects all case studies in this subcatchment) Catchment River basin district Alpi Orientali River basin Adige Subcatchment River name rio Mareta Area category Area (km2) 212212 km² <br />21,200 ha <br /> Maximum altitude category Maximum altitude (m) Dominant geology Ecoregion Alps Dominant land cover Waterbody ID Site Edit site Name Stanghe (Sterzing-Vipiteno) WFD water body codes WFD (national) typology WFD water body name Pre-project morphology Reference morphology Desired post project morphology Heavily modified water body No National/international site designation Local/regional site designations Protected species present No Invasive species present No 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 Works started 2008/01/01 Works completed 2010/10/31 Project completed Total cost category Total cost (k€) Benefit to cost ratio Funding sources UE founds (FESR 2007-2013) 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 Continuity of sediment transport Biology Fish Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Dam removal Floodplain / River corridor Planform / Channel pattern Channel widening 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 Width & depth variation No Yes No No No Improvement Channel pattern/planform No Yes Yes Yes No Improvement Continuity of sediment transport No Yes No Yes No Improvement Biological quality elements Edit biological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Fish No Yes No Yes No Invertebrates No Yes No No No 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 river bank vegetation No Yes No No No Birds No Yes No No No Amphibians No Yes No No No dragonflies No Yes No No No 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