Case study:Rio San Martino and Piovega di Scandolara restoration project

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Location: 45° 36' 15", 12° 6' 37"
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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, 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
A view of Rio San Martino in one of the restored portions

Project summary

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The main objectives of this project concerned the reduction of flood risk and of nutrients supply to Venice Lagoon to avoid eutrophication; in the same time an increase of biodiversity was expected. These different objectives have been reached by a number of restoration actions: river section enlargement, increase of sinuosity by the creation of new meanders,in-stream and out-stream wetlands and adoption of new practices in river management to permit a complete or partial preservation of aquatic vegetation; the creation of 1600 m.of new woody riparian buffer was mainly done for nutrient removal.

Monitoring surveys and results

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Lessons learnt

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Image gallery


A new buffer strip inside the enlarged bed section
Piezometers to monitor the nitrogen removal from groudwater by buffer strip
A new wide forested floodplain
In-stream wetland
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Catchment and 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) 2,038
2,038 km²
203,800 ha
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 Sant'Ambrogio restoration project, Salzano wetland and Marzenego river restoration project, Scolo Desolino restoration project, Zero river restoration project


Site

Name Rio San Martino near Scorzè
WFD water body codes 672_30
WFD (national) typology
WFD water body name Fiume Dese
Pre-project morphology Plane bed
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 Artificially regulated
Dominant substrate Sand
River corridor land use Intensive agriculture (arable)
Average bankfull channel width category 2 - 5 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

Reach length directly affected (m) 3,000
3,000 m
3 km
300,000 cm
Project started 2005
Works started
Works completed
Project completed
Total cost category 1 - 10 k€
Total cost (k€)
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 Less than 1 k€ 20000
20,000 k€
20,000,000 €
University of Bologna Bruno Boz



Reasons for river restoration

Mitigation of a pressure Nutrient removal to reduce eutrophication, Flood risk management
Hydromorphology Create a more natural channel morphology
Biology Fish, Macrophytes, Macrozoobenthos
Physico-chemical Reduce Nitrogen, Phosphorous, Organic pollution
Other reasons for the project Increase fruition and biodiversity in general in a agricultural and urban contest


Measures

Structural measures
Bank/bed modifications
Floodplain / River corridor Floodplain reconnection, Floodplain creation, Buffer strips
Planform / Channel pattern Channel naturalisation, Channel widening, Meandering channel
Other Creation of in-stream and out-stream wetland
Non-structural measures
Management interventions Adoption of new practices for aquatic vegetation management
Social measures (incl. engagement) Involvement of farmers in buffer strips plantation
Other


Monitoring

Hydromorphological quality elements

Element When monitored Type of monitoring Control site used Result
Before measures After measures Qualitative Quantitative

Biological quality elements

Element When monitored Type of monitoring Control site used Result
Before measures After measures Qualitative Quantitative

Physico-chemical quality elements

Element When monitored Type of monitoring Control site used Result
Before measures After measures Qualitative Quantitative
Nutrient concentrations Yes Yes No Yes Yes Improvement

Any other monitoring, e.g. social, economic

Element When monitored Type of monitoring Control site used Result
Before measures After measures Qualitative Quantitative


Monitoring documents



Additional documents and videos


Additional links and references

Link Description
http://http://www.cirf.org/rf2012/atti/rischio Cornelio.pdf Presentation describing the project presented at the II Conference on river restoration in Italy (2012) - In Italian
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

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