Case study:Salzano wetland and Marzenego river restoration project

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Location: 45° 32' 2.12" N, 12° 7' 52.90" E

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Project overview

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Status	Complete
Project web site
Themes	Flood risk management, Habitat and biodiversity, Land use management - forestry, Monitoring, Social benefits, Water quality
Country	Italy
Main contact forename	Paolo
Main contact surname	Cornelio
Main contact user ID
Contact organisation	Consorzio di Bonifica Acque Risorgive
Contact organisation web site	http://www.acquerisorgive.it/
Partner organisations
Parent multi-site project
This is a parent project encompassing the following projects	No

Salzano wetland after restoration

Project summary

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In order to reduce eutrophication problems that severely impair the quality of the Venice lagoon waters, the local government (the Veneto Region Authority), more than a decade ago,established a series of targets for the the reduction of nutrients that flow into the lagoon. As a detailed example, The “Salzano wetland” restoration was completed by the consortium which was, until the mid-1980s, subject to mining of clay. Since this period this 60 ha site has gradually been restored. Today this site is characterized by a mosaic of habitats of different spatial extent. The main actions of the project were: a) to create a system of new banks around a dry and with low ecological value portion (20 ha wide) of the extent wetland, and later to connect this area with the adjacent watercourse using gates to manage flows; b) reshaping the net of canals, ponds and pools inside this area to find the optimal residual time of the water to assure an efficient nutrient reduction; c) re-establish rare and endangered aquatic vegetation types (Carex elata, Cladium mariscus, Allium angulosum, Cirsium canum, Senecio paludosus, Typha laxmannii, Iris pseudacorus and Nuphar luteum) and monitor their development; d) create a new net of small channels to connect this restored wetland to the other portions; e) create a net of path and observation structures accessible to the public for recreation, educational and technical-scientific purposes.

Monitoring surveys and results

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Image gallery

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Map of Salzano wetland

View of Salzano wetland after restoration

Inlet point

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 Bacino scolante della Laguna di Venezia Subcatchment River name Bacino scolante della Laguna di Venezia Area category 1000 - 10000 km² Area (km2) 2,0382,038 km² <br />203,800 ha <br /> Maximum altitude category 100 - 200 m Maximum altitude (m) Dominant geology Ecoregion Italy and Corsica Dominant land cover Intensive agriculture (arable) Waterbody ID Other case studies in this subcatchment: Pagana canal restoration project, Rio San Martino and Piovega di Scandolara restoration project, Rio Sant'Ambrogio restoration project, Scolo Desolino restoration project, Zero river restoration project Site Edit site Name Salzano wetland and Marzenego river WFD water body codes 666_10 WFD (national) typology WFD water body name MARZENEGO - OSELLINO (DIRAM.) Pre-project morphology Artificial channel Reference morphology Low gradient passively meandering Desired post project morphology Heavily modified water body Yes National/international site designation Italy - Siti di Importanza Comunitaria Local/regional site designations SIC IT3250008 Protected species present Yes Invasive species present Yes Species of interest Carex elata, Cladium mariscus, Allium angulosum, Cirsium canum, Senecio paludosus, Typha laxmannii, Iris pseudacorus and Nuphar luteum Dominant hydrology Artificially regulated Dominant substrate River corridor land use Intensive agriculture (arable) 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 1 - 10 m³/s Mean annual discharge (m3/s) Average channel gradient category 0.001 - 0.01 Average channel gradient Average unit stream power (W/m2) Project background Edit project background Reach length directly affected (m) Project started 2007 Works started Works completed Project completed 2009/10/01 Total cost category 1000 - 5000 k€ Total cost (k€) 2,7142,714 k€ <br />2,714,000 € <br /> Benefit to cost ratio Funding sources Veneto Region - “Piano per la prevenzione dell’inquinamento ed il risanamento delle acque del bacino idrografico immediatamente sversante in Laguna – Piano Direttore 2000” 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 Nutrient removal to reduce eutrophication, reduce flood risk, increase lost biodiversity Hydromorphology Reconnect river to an out-flow wetland and create a more natural morphology inseide the wetland Biology Increase ecological status of Macrophytes Physico-chemical Reduce Nitrogen, Phosphorous and Organic pollution Other reasons for the project Increase fruition and biodiversity in general Measures Edit Measures Structural measures Bank/bed modifications Reshaping the net of canals, ponds and pools inside the wetland Floodplain / River corridor Hydraulic connection between the river and an outflow wetland Planform / Channel pattern Other re-establish rare and endangered aquatic vegetation types Non-structural measures Management interventions Social measures (incl. engagement) create a net of path and observation structures accessible to the public for recreation, educational and technical-scientific purposes 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 Nutrient concentrations No Yes No Yes No 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 Monitoring of nutrient removal in Salzano wetland_Shyntesis of results (in Italian) Additional documents and videos Upload additional documents Additional links and references Edit links and references Link Description http://http://www.acquerisorgive.it/page.asp?m=18 A website section dedicated to river restoration projects, studies and monitoring results by Consorzio Acque Risorgive Supplementary Information Edit Supplementary Information Image gallery Edit Image gallery Map of Salzano wetland View of Salzano wetland after restoration Inlet point