Case study:Zero river restoration project

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Location: 45° 33' 41.77" N, 12° 20' 7.28" 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 - agriculture, 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	p.cornelio@acquerisorgive.it
Contact organisation web site	http://www.acquerisorgive.it/
Partner organisations
Parent multi-site project
This is a parent project encompassing the following projects	No

The Zero river at the beginning of the restored portion

Project summary

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The Consorzio di Bonifica Acque Risorgive (drainage authority) is located within the pumped drainage landscape of the Venice Lagoon. The Consorzio was involved in a large programme aimed at developing a catchment strategy to reduce nutrient loads entering the Venice Lagoon from its tributaries. To achieve this goal, the Consorzio planned a major river restoration project for the Zero River, which drains into the lagoon. The main restoration actions carried out regarded: banks widening, increase of aquatic vegetation on river terraces, creation of lateral and inflow wetland (ponds and lakes) and creation of wooded riparian area irrigated by river water. Within this project a pilot experimental system was built along the Zero River, to evaluate in particular the buffering efficiency of the wooded areas on non-point pollution sources of nitrogen. On the experimental site, represented by a newly-established riparian woodland, the hydrology of the woodland is totally regulated through a series of pumps which irrigate the woodland with water coming from Zero River, through a series of parallel ditches (irrigation and drainage ditches). The results of this study provided useful data and know-how for improving the management of riparian buffer zones.

Monitoring surveys and results

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Lessons learnt

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Image gallery

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Zero river after restoration

In stream wetland

Newly afforested riparian buffer

Zero river widening

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, Salzano wetland and Marzenego river restoration project, Scolo Desolino restoration project Site Edit site Name Zero river WFD water body codes 673_32 WFD (national) typology WFD water body name Zero river Pre-project morphology Artificial channel Reference morphology Low gradient passively meandering Desired post project morphology Heavily modified water body Yes National/international site designation Local/regional site designations Protected species present Yes Invasive species present Yes Species of interest Dominant hydrology Groundwater Dominant substrate Clay 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 2 - 5 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) 7,0007,000 m <br />7 km <br />700,000 cm <br /> Project started 1999 Works started Works completed Project completed 2004/01/01 Total cost category 5000 - 10000 k€ Total cost (k€) 7,2307,230 k€ <br />7,230,000 € <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 Hydromorphology Create a more natural and wide channel morphology Biology Increase ecological status of Fish, Macrophytes, Macrozoobenthos Physico-chemical Reduce Nitrogen, Phosphorous and Organic pollution Other reasons for the project Increase fruition and biodiversity in general in a agricultural and urban contest Measures Edit Measures Structural measures Bank/bed modifications Bed enlargement Floodplain / River corridor Creation and reconnection of floodplain and new buffer strips Planform / Channel pattern Channel widening Other Creation of in-stream wetland and connection with an out-stream wetland Non-structural measures Management interventions Adoption of new practices for acquatic vegetation management, pumping water to an adjacent newly afforested riparian buffer for nitrogen and phosphorous removal Social measures (incl. engagement) Involvement of farmers in buffer strips plantation, education of students 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 Fish No Yes No Yes 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 Nutrient concentrations No Yes No No Yes Improvement 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 nitrogen removal in the riparian buffer - summary Additional documents and videos Upload additional documents Venice lagoon RR ecrr conference english version.pdf Additional links and references Edit links and references Link Description http://onlinelibrary.wiley.com/doi/10.1111/j.1365-2664.2011.02025.x/abstract Scientific paper on monitoring of the riparian buffer 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