General
National Id
Austria_01
Site name
4 specific sites: Obergottesfeld, Rosenheim, Amlach/St. Peter and Feistritzbach
Summary
At three different sections of the Austrian Drau the river bed was enlarged and restoration works have taken place. Moreover, 25 ha of riparian forest were created as well as meadows, lakes and several river branches.
The in-depth description of the case study
Location description
The project side lies close to the Italian border in the west of Klagenfurt. The revitalized parts of the Drau are between Spittal i.Dr. and Oberdrauburg.
NUTS Code
Kärnten
RBD code
AT1000
Transboundary
1
Data provider
Sabine Tutte, ACTeon
Source(s)
NWRM(s) implemented in the case study
Longitude
12.96743
Latitude
46.748666
Site information
Climate zone
cool temperate moist
Mean rainfall
1100
Mean rainfall unit
mm/year
Average temperature
7
Mean runoff
73,8
Mean runoff unit
600 - 750 mm
Type
Actual Test Site
Light or indepth?
In-depth
Average slope range
0-1%
Vegetation class
In the surroundings of the upper Drau one can find a big variety of different landuses: forest, meadows, fields.
Monitoring maintenance
Monitoring location
In-Stream
Administrative annual costs
10000
Monitoring parameters
The monitoring is still ongoing for the riverbed. It is controlled whether bedload balance is reached and whether the erosion of the bed is stopped. Given that the Drau is let more freedom to form its river bed monitoring is done how the shape of the river develops. The biological monitoring is accomplished. The number of fisch, amphibian and insect species were counted
Performance
Performance impact estimation method
Catchment outlet
Performance impact estimation information
-Assessment of aerial photos
- Geodetic survey of cross profiles (echolot)
- Laserscanning with drones
- Steel plates are on the bottom of the river in order to measure the transported load in size and volume with ultrasound
- Life space mapping
- Geodetic survey of cross profiles (echolot)
- Laserscanning with drones
- Steel plates are on the bottom of the river in order to measure the transported load in size and volume with ultrasound
- Life space mapping
Design & implementations
Application scale
River Basin
Installation date
2011
Performance timescale
5 - 10 years
Area (ha)
26
Size
5
Size unit
km
Constraints
The availability of land determines which measures can be used and how expensive the implementation of the measures will be.
Favourable preconditions
The erosion of the river bed should be stopped. This goal determined the choice of measures.
Public consultation
1
Contractural arrangements
0
Design contractual arrangement
| Arrangement type | Responsibility | Role | Comments | Name |
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Design consultation activity
| Activity stage | Key issues | Name | Comments | |
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Implementation phase
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Implementation phase
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Implementation phase
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Design phase
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Other
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Implementation phase
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Implementation phase
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public inaugauration feasts e.g. for the new dam or the different enlarged riverparts
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Implementation phase
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information day for school children
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Implementation phase
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tree planting event for children
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Design phase
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tourism concept, guided routes within the national park
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Other
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post card showing before after pictures of the drau
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Implementation phase
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VIP event: Mimi Hughes (marathon swimmer and environmental activist swam through the drau until danube
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Design land use change
| Land use change type |
|---|
Design authority
| Authority type | Role | Responsibility | Name | Comments | |
|---|---|---|---|---|---|
Lessons, risks, implications...
Key lessons
By adapting open check dams the bed load balance of a river can be improved. The reconnections of side arms, the creation of riparian forests and meadows support a greater biodiversity.
Financing mechanism
0
Financing difficulties
0
Success factor(s)
| Success factor type | Success factor role | Comments | |
|---|---|---|---|
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Attitude of the public
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main factor
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Since the revitalization measures on the Drau are a subsequent project to former projects and measures, much less publicity had to be done. The responsibles hadn't to face the fears and worries of farmers and citizens. |
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Existing staff and consultant knowledge
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main factor
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20 years of experience exist on restoring the river to a more natural state. Moreover, there is good cooperation between the different stakeholders for nature conservation and hydraulic engineering. |
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Other
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secondary factor
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The regional touristic department supported the measure and furthermore helped to merchandise the Drau project. They looked amongst others at the following questions: How to design picnic areas? Where are the best places for information boards? How can we conduct tourists through the region? |
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Attitude of decision makers
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main factor
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The purchase of land was combined with a reallocation of land process. Lots were exchanged between farmers. There were a lot of farmers willing to give land for the project and there was also political support of the action. A company constructing/operating hydropower plants had bought lots in the 90s. After their project of building 4 new power plants on the Drau was refused they were nevertheless ready to give their lots to the project partners for a fair price. |
Financing
| Financing type | Comments | |
|---|---|---|
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EU-funds: LIFE+
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1.5 Moi €
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Sub-national funds
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Carinthian State Government: 0.2 Million €; Torrent and Avalanche Control: 0.2 Million €
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National funds
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Federal Ministry for Agriculture, Forestry, Environment and Water Management 2.7 Mio €
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Driver
| Driver type | Driver role | Comments | |
|---|---|---|---|
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Other
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main driver
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Erosion of the river bed was observed (becoming deeper and deeper). There was furthermore a risk that floodplains fall dry and can't operate anymore, as well as a risk of a falling ground water table.
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Financing share
| Financing share type | Share | Comments | |
|---|---|---|---|
Policy, general governance and design targets
Policy description
WFD pressure: physical alteration of channel/bed/riparian area/shore of water body for agriculture and transportation.
Bed load balance shall be achieved. Due to missing pebble supply the Drau river bed became deeper and deeper. Thus the groundwater level decreased, bank stabilization became insecure and flood plains inoperable.
Bed load balance shall be achieved. Due to missing pebble supply the Drau river bed became deeper and deeper. Thus the groundwater level decreased, bank stabilization became insecure and flood plains inoperable.
Part of wider plan
1
Policy target
| Target purpose | |
|---|---|
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Runoff control
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Improved Biodiversity
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Increase Water Storage
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Policy pressure
| Pressure directive | Relevant pressure |
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Policy area
| Policy area type | Policy area focus | Name | Comments |
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Policy impact
| Impact directive | Relevant impact |
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Policy wider plan
| Wider plan type | Wider plan focus | Name | Comments | |
|---|---|---|---|---|
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Catchment-based
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Water
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water body-development-concept
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Plan made in the middle of 90s (93 or 94). Programme for the whole river Drau.
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Policy requirement directive
| Requirement directive | Specification |
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Socio-economic
Direct benefits
3250000
Direct benefits information
Total expenses for the implementation of the project given to regional companies, planning offices.
Ancillary benefits information
The tourism department definitetly benefitted from the Drau project but this cannot be quantified yet.
Costs investment
92
Costs investment information
longlasting infrastructure goods (measuring instruments, gauge installation)
Costs capital
2275000
Costs capital information
construction
Costs land acquisition
670000
Costs land acquisition unit
€ (total value)
Costs land acquisition information
purchase of land and compensation
Costs operation maintenance
No special, project-linked expenses.
Every few years maintenance has to be done as on every other river like cutting grass or trees.
Every few years maintenance has to be done as on every other river like cutting grass or trees.
Costs total
4475000
Costs total information
total costs of the project
Economic costs other annual
98000
Ecosystem improved biodiversity
1
Information on Ecosystem improved biodiversity
Number of amphibian species multiplied by six.
Number of insect and fish species increased as well. Until mid 2011 28000 km3 were mobilized by the open checked dam and 16000 km3 arrived at the Drau. As consequence the bedload balance could be improved and the riverbed stabilized.
Number of insect and fish species increased as well. Until mid 2011 28000 km3 were mobilized by the open checked dam and 16000 km3 arrived at the Drau. As consequence the bedload balance could be improved and the riverbed stabilized.
Ecosystem provisioning services
0
Information on Ecosystem provisioning services
no information available
Ecosystem impact climate regulation
Increased permanent biomas
Information on Ecosystem impact climate regulation
Given that buffer strips, riparian forests and meadows were created/restored permanent biomas has increased.
Biophysical impacts
Information on retained water
No quantitative data. However riparian forests were planted and buffer stripes installed along the river shore. These measurements favour an increase of water storage capacity.
Information on increased water storage
No quantitative data. Side arms were reconnected to the main channel and the riverbed itself was enlarged. As a consequence storage capacity must have increased.
Information on runoff reduction
no data available
Water quality overall improvements
N/A info
Information on Water quality overall improvements
Riparian forests may act as buffers for diffuse pollution input for water from fields (nitrogen, phosphorous, herbicide flux).
Soil quality overall soil improvements
N/A info
Information on Soil quality overall soil improvements
No monitoring is done on this aspect since it was not targeted in the project.
