Case study:Pagana canal restoration project: Difference between revisions
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|Project summary=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: | |Project summary=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. | 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. | |||
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Revision as of 09:31, 3 April 2013
This case study is pending approval by a RiverWiki administrator.
Project overview
| 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 |
Project summary
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
Lessons learnt
Catchment and subcatchment
Site
| Name | |
|---|---|
| WFD water body codes | |
| WFD (national) typology | |
| WFD water body name | |
| Pre-project morphology | |
| Reference morphology | |
| Desired post project morphology | |
| Heavily modified water body | |
| National/international site designation | |
| Local/regional site designations | |
| Protected species present | |
| Invasive species present | |
| Species of interest | |
| Dominant hydrology | |
| Dominant substrate | |
| River corridor land use | |
| Average bankfull channel width category | |
| Average bankfull channel width (m) | |
| Average bankfull channel depth category | |
| Average bankfull channel depth (m) | |
| Mean discharge category | |
| Mean annual discharge (m3/s) | |
| Average channel gradient category | |
| Average channel gradient | |
| Average unit stream power (W/m2) |
Project background
| Reach length directly affected (m) | |
|---|---|
| Project started | |
| Works started | |
| Works completed | |
| Project completed | |
| Total cost category | |
| Total cost (k€) | |
| Benefit to cost ratio | |
| Funding sources |
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
| Mitigation of a pressure | |
|---|---|
| Hydromorphology | |
| Biology | |
| Physico-chemical | |
| Other reasons for the project |
Measures
Structural measures
| |
|---|---|
| Bank/bed modifications | |
| Floodplain / River corridor | |
| Planform / Channel pattern | |
| Other | |
Non-structural measures
| |
| Management interventions | |
| Social measures (incl. engagement) | |
| 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 | |||
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
Image gallery
Additional documents and videos
Additional links and references
| Link | Description |
|---|
Supplementary Information
Edit Supplementary Information