River basin management of the Ill, France

National Id
France 05 light
Site name
Ill between Colmar and Strasbourg
Summary
Next to the Ill river in Alsace, France, a project has been initiated which combines classical flood protection (e.g. dyke construction) with natural water retention measures (e.g. riparian buffers). The project aims at reducing peak flows, increasing water storage, controling erosion and improving biodiversity. It has been initiated by the Alsace Region.
NUTS Code
Alsace
RBD code
FRC
Transboundary
0
Data provider
Sabine Tutte, ACTeon
Longitude
7.747882
Latitude
48.583148
Climate zone
cool temperate dry
Mean rainfall
550
Mean rainfall unit
mm/year
Average temperature
10
Mean runoff
58
Mean runoff unit
600 - 750 mm
Type
Modelled/Simulated Example
Light or indepth?
Light
Monitoring impacts effects
0
Monitoring location
In-Stream
Administrative annual costs
340000
Administrative annual cost information
Installation of counting stations on fish passes.
Monitoring parameters
Stations for counting fish are installed next to barrages and hydropower plants.
Performance impact estimation information
No information available
Application scale
River
Performance timescale
Immediate
Area (ha)
12000
Constraints
Partly dams have to be constructed or reinforced, otherwise the risk of severe inundation would not be justifiable. In order to maintain the natural mobility of the river, land of farmers has to be reallocated.
Contractural arrangements
0
Design contractual arrangement
Comments
The project has to pass the autorisation steps of the French Water Law. Moreover it has to be proven that the project is of public utility and of public interest in order to mobilize national funds
Design consultation activity
Activity stage
Implementation phase
Key issues
This is foreseen in project planning in order to educate the public.
Name
Guide "rights and duties of riparians"
Design authority
Authority type
Other
Role
Initiation of the measure
Name
Region of Alsace
Comments
Next to the initiation of the measures, the region is also responsible for financing
Authority type
Local water authority
Role
Financing
Name
AERM (Agence de l'eau Rhin-Meuse)
Comments
one of the main project financers
Authority type
Other
Role
Financing
Name
Conseils Généraux du Bas et Haut Rhin
Comments
touristic development
Authority type
Other
Role
Financing
Name
ADEME (Environment and Energy Agency)
Comments
Financial support of hydropower projects (deconstruction off barrages, installation of fish passes...)
Authority type
Other
Role
Other
Name
communes
Comments
Maintenance/ development of touristic activities and communal hydropower stations
Name
syndicats
Name
communes
Key lessons
This management plan combines classical flood protection measures (construction of dykes, automatisation/optimization of barrages) with NWRM. Since the plan is not fully implemented yet, it is difficult to have information on success (especially quantitative data) and monitoring. However, ecosystem services are taken into account to justify the measures.
Financing difficulties information
Since the project is in the implementation phase, there is no sufficient information.
Success factor(s)
Comments

Since the project is in the implementation phase, there is no sufficient information.

Financing
Financing type
EU-funds: Rural development funds
Comments
Support of sustainable farming (crop rotation, green cover...).
Financing type
Local funds
Comments
Renovation of dykes, touristic development.
Financing type
Sub-national funds
Comments
Publicity, support of hydropower, touristic development.
Financing type
Sub-national funds
Comments
Renovation of barrages, NWRM, Agro-environmental measures.
Financing type
National funds
Comments
Support of hydropower projects.
Barrier
Comments
Since the project is in the implementation phase, there is no sufficient information.
Driver
Driver type
Legal obligations
Driver role
main driver
Comments
The good ecological status of the Ill has to be achieved.
Driver type
Past flooding events
Driver role
main driver
Comments
Due to regular floods in winter and spring there are severe damages on pastures and fields. Valuable agricultural land is lost (approx. 150 ha in 10 years). Agriculture is a very important economic branch with a gross margin of 16 million €
Driver type
Public pressure
Driver role
main driver
Comments
Flood protection is partly missing for entire villages (Kogenheim 1000 inhabitants). Dykes have weak points and need to be renovated.
Driver type
Balancing different objectives
Driver role
secondary driver
Comments
Water and terrestrial hiking pathways are missing. Barrages are not passable, and dangerous due to a lack of signalisation. Fishing associations wish a better accessibility to the river.
Financing share
Comments
Cannot be said at the moment. The financing partners listed above are potential sources for financing.
Policy description
The flood protection of commuities and fields is partly unsufficient. Due to erosion there is a remarkable loss of usable agricultural surface. Barrages and hydropower plants disturb the sediment transport of the river and are not passable for fish and boats. A natural alluvial forest is often missing and shall be restored for water quality improvement and fight against invasive species.
Quantified objectives
The flood protection for some communities is missing, barrages and hydropower plants are not passable for fish and boats. The mobility of the river shall be preserved without encouraging further erosion. Therefore a land allocation process starts, alluvial forests are planted (68 km) and where possible barrages and bank stabilisations are deconstructed. Moreover, 15 hydraulic annexes are reconnected to the river in order to improve water storage capacity and solve water distribution problems. A discharge rill is constructed to the forest near Colmar in order to inundate the wood during flood events and protect fields and communities.
Part of wider plan
0
Policy target
Target purpose
Peak-flow reduction
Target purpose
Increase Water Storage
Target purpose
Erosion Control
Target purpose
Improved Biodiversity
Target purpose
Oher Societal Benefits
Direct benefits information
During the project the tourism branch is supported by improved water/ terrestrial trekking ways, better recreational spaces (bivouacs, camping, hotel restaurant access).
Ancillary benefits information
Without the management plan, 6.1 - 8 Mio € per year have to be foreseen as costs for floods.
Costs investment
12500000
Costs investment information
10 to 15 million Euros: plantation of forests, land acquisition, dyke renovation.
Costs operation maintenance
No data available
Costs total
25500000
Costs total information
19 to 32 million Euros: Next to NWRMs, construction costs for dykes and improvement of barrages and facilities appear. Moreover, the touristic branch is supported by several projects, and hydropower is encouraged as well.
Compensations annual
2000000
Compensations annual information
Support of farmers by agro-environmental measures (encouragement of green cover, pastures, meadows, crop rotation).
Compensations scheme information
The agricultural compensations made in the context of EU CAP Pillar 2.
Economic costs additional
300000
Information on Economic costs additional
Total costs for publicity
Information on Ecosystem improved biodiversity
Control campaigns for Himalayan Balsam and Japanese Knotweed; plantation of alluvial forests (high species diversity due to diverse habitats).
Information on Ecosystem provisioning services
Better efficiency of hydropower plants due to improved sediment balance.
Information on Ecosystem impact climate regulation
No information available
Information on retained water
By reconnecting hydraulic annexes, installing discharge rills to flood forests and reallocation of land neighboring the river, the water retention capacity gets increased.
Information on runoff reduction
This shall be achieved by natural bank stabilisation and deconstruction of old barrages. By purchasing land a "mobility space" for the river shall be guaranteed.
Information on Maintenance baseflow
This shall be achieved by automatisation of barrages and optimized operation.
Information on Restoring hydraulic connections
Connections are restored.
Water quality overall improvements
N/A info
Information on Water quality overall improvements
This shall be achieved by restoring 68 km of alluvial forests next to the Ill.
Soil quality overall soil improvements
N/A info

Partners

Logos of all partners of NWRM project