Case study:Pagana canal restoration project

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Location: 45° 30' 2.96" N, 12° 17' 23.89" 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, Spatial planning, 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://http://www.acquerisorgive.it/
Partner organisations
Parent multi-site project
This is a parent project encompassing the following projects	No

The restored portion of Pagana canal

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 some restoration projects aimed at developing a catchment strategy to reduce nutrient loads entering the Venice Lagoon from its rivers. The bed of Pagana Canal (3.5 km) was covered with cement, and thus its contribution to the biodiversity of agricultural-forest habitats and to the reduction of N and P loads to Venice Lagoon was almost non-existent. The restoration project carried out these actions:

1. Total removal of concrete covers: concrete (240 cm wide on the bottom and 320 cm wide at the top, with 150 cm high sidebanks) was completely removed in a 1.5 km long reach.
2. Partial removal of concrete covers: near buildings concrete was left in place or only partially removed, creating a flooding area and banks with reduced slope.
3. Widening and diversification of the reaches: the new section of the Pagana Canal is variable in size, with long reaches 12 m large and larger size in the central section (15-70 m). The presence of wide banks with reduced slope allowed reducing erosion and increasing the number of vegetation species in the riparian area and, more in general, a larger water-vegetation contact zone. Morphological changes in the riverbed enhanced biological complexity thus increasing the buffering actions on nutrients, which enter the food-web of the wet biotopes.
4. Creation of ponds and wetlands: ponds and wetlands of different depths were constructed at the joining with the main tributaries. The presence of wetlands along the watercourse allowed to further enhancing biodiversity with increases in water quality and the landscape and natural value of the area.

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Image gallery

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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: 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, Zero river restoration project Site Edit site Name Fossa Pagana near Favaro WFD water body codes 668_10 WFD (national) typology WFD water body name FOSSA PAGANA - COLLETTORE DI LEVANTE Pre-project morphology Artificial bed 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 Artificially regulated Dominant substrate Clay River corridor land use Urban Average bankfull channel width category 5 - 10 m Average bankfull channel width (m) Average bankfull channel depth category 0.5 - 2 m Average bankfull channel depth (m) Mean discharge category 0.1 - 1.0 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) 3,5003,500 m <br />3.5 km <br />350,000 cm <br /> Project started 2002 Works started Works completed Project completed 2004/10/01 Total cost category 5000 - 10000 k€ Total cost (k€) 4,6484,648 k€ <br />4,648,000 € <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 removal of cement covers, diversification Floodplain / River corridor Planform / Channel pattern Channel widening Other Creation of in-stream wetland Non-structural measures Management interventions Adoption of new practices for aquatic vegetation management, pumping water to an adjacent newly afforested riparian buffer for nitrogen and phosphorous removal 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 Venice lagoon RR ecrr conference english version.pdf Additional links and references Edit links and references Link Description 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