Case study:Pagana canal restoration project: Difference between revisions

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|Reach length directly affected=3,500
|Project started=2002
|Project completed=2004/10/01
|Total cost category=5000 - 10000 k€
|Total1 cost=4,648
|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”
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Revision as of 10:05, 3 April 2013

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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:

a) Total removal of cement covers: the cement cover (240 cm wide on the bottom and 320 cm wide at the top, with 150 cm high side banks) was completely removed in a 1.5 km long reach. b) Partial removal of cement covers: near buildings the cement cover was left in place or only partially removed, creating a flooding area and banks with reduced slope. c)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. d)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.

Monitoring surveys and results

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Lessons learnt

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Catchment and subcatchment

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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

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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

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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

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Mitigation of a pressure
Hydromorphology
Biology
Physico-chemical
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Measures

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Structural measures
Bank/bed modifications
Floodplain / River corridor
Planform / Channel pattern
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Non-structural measures
Management interventions
Social measures (incl. engagement)
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Monitoring

Hydromorphological quality elements

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

Biological quality elements

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quality elements
Element When monitored Type of monitoring Control site used Result
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Physico-chemical quality elements

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quality elements
Element When monitored Type of monitoring Control site used Result
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Any other monitoring, e.g. social, economic

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Monitoring documents

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Supplementary Information

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