National Id
Lux_03
Site name
Alzette river restoration in the 'Am Brill' nature reserve in Schifflange
Summary
The Alzette river (Luxembourg) restoration project aimed at erasing the effect of the river chanelling, which caused the river uniformisation and an ecological impoverishment. The project consisted in a remeandering, increase of the base level of the river, widening of the riverbed, reconnection of the river to existing ponds and creation of a new pond.
Light or indepth?
Light
NUTS Code
Luxembourg
RBD code
LU RB_000
Transboundary
0
NWRM(s) implemented in the case study
Longitude
6.007891
Latitude
49.509026
Climate zone
cool temperate moist
Mean rainfall
853
Mean rainfall unit
mm/year
Average temperature
9.2
Type
Case Study Info
Performance impact estimation method
Unknown
Application scale
Field Scale
Performance timescale
< 1 year
Size
700
Size unit
m
Design capacity description
The project was designed to restore the natural functioning of the river.
Constraints
No main constrain identified.
Design contractual arrangement
Arrangement type Responsibility Role Comments Name
Design consultation activity
Activity stage Key issues Name Comments
Design land use change
Land use change type
Design authority
Authority type Role Responsibility Name Comments
Local water authority
Initiation of the measure
Municipal council of Schifflange
Key lessons
The Alzette river restoration project aimed at erasing the effect of the river chanelling, which caused the river uniformisation and an ecological impoverishment.
The project consisted in a remeandering, increase of the base level of the river, widening of the riverbed, reconnection of the river to existing ponds and creation of a new pond. The project contributed to restore the flood plain, to prevent flooding and erosion, to restore the natural functionning of the river, to improve the self purification capacity, to improve biodiversity and to intergrate the river in the natural landscape.
Success factor(s)
Success factor type Success factor role Comments
Financing
Financing type Comments
Barrier
Barrier type Barrier role Comments
Driver
Driver type Driver role Comments
Past flooding events
main driver
A flood event occurred in Schifflange in 1998.
Financing share
Financing share type Share Comments
Policy description
A flood in Schifflange happened in 1998. A proposition for a project was elaborated afterwards. The main objective was to restore the natural reserve "Am Brill" and to prevent flooding.
Policy target
Target purpose
Peak-flow reduction
Improved Biodiversity
Policy pressure
Pressure directive Relevant pressure
Policy area
Policy area type Policy area focus Name Comments
Policy impact
Impact directive Relevant impact
Policy wider plan
Wider plan type Wider plan focus Name Comments
Policy requirement directive
Requirement directive Specification
Direct benefits information
No information available
Ancillary benefits information
No information available
Costs investment
700000
Costs investment information
The investments were essentialy dedicated to filling and clearing works.
Costs operation maintenance
No information available
Costs total
700000
Costs total information
The investments were essentialy dedicated to filling and clearing works.
Ecosystem improved biodiversity
1
Information on Ecosystem improved biodiversity
Biodiversity improvement was expected.
Ecosystem impact climate regulation
No information available
Retained water
60000
Retained water unit
m3/day
Information on retained water
The water storage restoration contributed to 15 mintutes delay of the peak flow. The maximal flow duration were reduced frome 42 to 24 minutes.
Water quality overall improvements
Positive impact-WQ improvement
Information on Water quality overall improvements
Positive effects on water quality are expected, but no assessment has been realised yet.
Soil quality overall soil improvements
N/A info
Information on Effect delaying peak
Significant. The peak flow is delayed by 15 minutes.