General
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
Site information
Climate zone
cool temperate moist
Mean rainfall
853
Mean rainfall unit
mm/year
Average temperature
9.2
Type
Case Study Info
Performance
Performance impact estimation method
Unknown
Design & implementations
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 |
|---|---|---|---|---|
Lessons, risks, implications...
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.
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 |
|---|
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, general governance and design targets
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
|
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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 |
|---|
Socio-economic
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
Biophysical impacts
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