Case study:Lower Aurino river: Gatzaue riverbed widening

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Location: 46° 50' 55.24" N, 11° 57' 20.93" E

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Project overview

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Status	Complete
Project web site
Themes	Flood risk management, Habitat and biodiversity, Hydromorphology, Social benefits, Spatial planning
Country	Italy
Main contact forename	Caterina
Main contact surname	Ghiraldo
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Contact organisation	Provincia Autonoma di Bolzano
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This is a parent project encompassing the following projects

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The Aurino river is a typical Alpine watercourse (basin Area 630 km2, average discharge in summer 30-50 m3/s) affected in the past by gravel extraction, construction of bank defences along part of its course and a major reduction of sediment load from upstream, due to weirs and other protection measures in most tributaries. This determined channel incision, reduction of riverbed width, alteration of morphological structures and dynamics and as a consequence reduced connection with the floodplain, lowering of the groundwater level and loss of riparian habitats (especially hygrophilic riparian forests of Alnus incana). A major effect was also a reduced flood retention capacity, and its recovery by reverting the incision process was one of the main drivers, together with biodiversity increase, to implement a catchment scale restoration scheme. This has been carried out, step by step, for more than a decade and further measures are foreseen. The three interventions in Gatzaue in 2005, 2009 and 2011 included removing a total of 50000 m3 of gravel from the formerly disconnected floodplain, widening the riverbed by approximately 35 m and, in order to stop incision, the construction of a ramp in 2005 and, in 2009 and 2011, the reintroduction in the same stretch of part of the gravel excavated from the river banks. A monitoring activity was implemented to study the geomorphological and biological effects of the project.

Works include: Creation of new lateral habitat for fishes,amphibians and birds (alcedo atthis).

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Aerial view before works

Aerial view after works

The riverbed after the works

Catchment and subcatchment Select a catchment/subcatchment Site Edit site Name Gatzaue WFD water body codes 03SS3N WFD (national) typology WFD water body name D_c Torrente Aurino Pre-project morphology Single channel Reference morphology Braided Desired post project morphology Heavily modified water body No National/international site designation Local/regional site designations Protected species present Yes Invasive species present No Species of interest Dominant hydrology Artificially regulated Dominant substrate Gravel River corridor land use Grassland Average bankfull channel width category 10 - 50 m Average bankfull channel width (m) Average bankfull channel depth category 0.5 - 2 m Average bankfull channel depth (m) Mean discharge category 10 - 100 m³/s 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 2003 Works started Works completed 2011/01/04 Project completed Total cost category 100 - 500 k€ Total cost (k€) 195195 k€ <br />195,000 € <br /> Benefit to cost ratio Funding sources Provincia Autonoma di Bolzano 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 Biodiversity increase, flood risk control, morphology restoration Hydromorphology Width & depth variation, Connection to groundwaters and floodplain Biology Fish, Invertebrates Physico-chemical Other reasons for the project Increase social activities Measures Edit Measures Structural measures Bank/bed modifications creation of new branches Floodplain / River corridor Floodplain reconnection Planform / Channel pattern Creation of new channel, Channel widening Other Fish habitat restoration Non-structural measures Management interventions Social measures (incl. engagement) Citizen participation in the restoration project 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 Channel pattern/planform No Yes Yes No Yes Improvement Connection to groundwaters Yes Yes No Yes No Improvement Structure & condition of riparian/lake shore zones No Yes No No 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 Invertebrates No Yes No Yes Yes No change 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 Riparian vegetation No Yes Yes No No No change Monitoring documents Upload monitoring documents Monitoraggio campana.pdf Additional documents and videos Upload additional documents Additional links and references Edit links and references Link Description Supplementary Information Edit Supplementary Information