11th CONGRESS INTERPRAEVENT 2008

26th to 30th May 2008 www.interpraevent2008.at

Congress Programme 11th Interpraevent Congress 2008 »Protection of populated territories from floods, debris flows, mass movements and avalanches« Introduction International Research Society Interpraevent

Interpraevent – both the society itself and the congress – stands for a meeting of science and practice in the field of “protection from natural hazards”. This meeting is international: it is an exchange of President: experiences beyond borders and continents, organisations and social Kurt Rohner Office of the Provincial Government of Carinthia, systems. Dep. 18 – Water Management, 9020 Klagenfurt, AT

How can topics which the research society Interpraevent has been dealing with for more than 40 years and which this year’s organiser, Vice-Presidents: Österreichische Wildbach- und Lawinenverbauung (Austrian Torrent Maria Patek Austrian Federal Ministry for Agriculture, Forestry, and Avalanche Control), has been handling for almost 125 years still Environment and Water Management, be up-to-date? 1030 Vienna, AT

We all – and not only the anonymous “society” – constantly increase Roberto Loat Swiss Federal Office for the Environment, Danger our demands on land use and mobility. At the same time, our demands Prevention, 3003 Bern, CH on security and personal integrity become increasingly greater. While we accept the risk of road traffic, for example, we take the view that Peter Frei Bavarian State Ministry of the Environment, Public we are able to (and have to) do something against almost all risks Health and Consumer Protection, 81925 Munich, DE resulting from natural hazards. In fact, new findings as well as tech- nologies for adverting and managing natural hazards are constantly Hiroshi Ikeya Sabo Technical Center, 102-0074 Tokyo, JP gained and developed. Rudolf Pollinger Autonomous Province of Bolzano-South Tyrol, Interpraevent is a platform where these findings and technologies can Dep. 30 – Special establishment for soil conserva- be presented and exchanged by scientists and practitioners. It is a tion, regulation of torrents and avalanche control, place where philosophies and organisations meet and get to know 39100 Bolzano, IT each other on a small and large level. Let us make use of this oppor- tunity to the best possible accomplishment of our aim: the reduction of substantial damages due to natural phenomena. Contact: Gernot Koboltschnig (business administration) Mießtalerstraße 1, 9020 Klagenfurt Tel.: +43 (463) 536-31 805 Fax: +43 (463) 536-31 828 E-Mail: [email protected] www.interpraevent.at Kurt Rohner Andreas Reiterer

2 3 Organising Committee Scientific-Techn. Advisory Committee

Chairman: Chairmen: Andreas Reiterer Austrian Forest Engineering Service for Torrent Matjaz Mikos University of Ljubljana, SI and Avalanche Control, Vorarlberg division Johannes Hübl University of Natural Resources and Applied Life Sciences, AT

Project manager: Niki Beyer-Portner HydroCosmos, CH Gerald Jäger Austrian Forest Engineering Service for Torrent Gernot Fiebiger Austrian Forest Engineering Service for and Avalanche Control, regional Torrent and Avalanche Control, AT construction management Rosa Frei Office of the Provincial Government of Vorarlberg, AT Project team members: Dieter Guthknecht University of technology, Vienna, AT Thomas Frandl Austrian Forest Engineering Service for Hans Kienholz University of Bern, CH Torrent and Avalanche Control, Bregenz Robert Kirnbauer Vienna technical University, AT regional construction management Eduard Klaghofer Federal Agency of Water Management, AT Hideaki Marui Niigata University, JP Margarete Wöhrer-Alge Austrian Forest Engineering Service for Florian Rudolf-Miklau BMLFUW – Ministry of Life, AT Torrent and Avalanche Control, Vorarlberg Michael Moser University of Erlangen – Nuremberg, DE division Paolo Simonini University of Padova, IT Fritz Zollinger Zurich Office for Landscape and Nature, CH Petra Rührnschopf Austrian Forest Engineering Service for Torrent and Avalanche Control, Vorarlberg division

Rudolf Schmidt Austrian Forest Engineering Service for Torrent and Avalanche Control, Flachgau and Tennengau regional construction management

Address: Rheinstraße 32/4, 6900 Bregenz Tel.: +43 (5574) 74995 Fax: +43 (5574) 74995-6 E-Mail: [email protected]

4 5 Technical-scientific exhibition Arrival

STUTTGART 200 km Trade fair D

FRI40 EDRICHSHAFEN MUNICH km 185 km Parallel to the 2008 Interpraevent Congress, a trade fair of the same LAKE CONSTANCE name will take place. Security-relevant and congress-related products BREGENZ 85 km 40 km A and services will be presented at this trade fair. For registration condi- ZURICH DORNBIRN ST.GALLEN/ 120 km 475 km tions, see: www.interpraevent2008.at. ALTENRHEIN 45 km VIENNA VADUZ INNSBRUCK CH FL 120 km 260 km I Student Poster Award 2008 MILAN BOLZANO VENICE The international research society Interpraevent would like to an- nounce the Student Poster Award 2008 that will be awarded in the course of the 11th Interpraevent Congress in Dornbirn. www.flughafen-zuerich.ch www.fly-away.de www.munich-airport.de www.viennaairport.com

www.oebb.at www.sbb.ch www.bahn.de

further information at: www.bodensee-vorarlberg.com

6 7 Oral Presentations – Timetable 15:30 Takahisa Mizuyama (JP) Monitoring sediment transport in mountain torrents 15:50 Eva Gertsch (CH) Monday, 26th May 2008 Bedload transport of Alpine torrent systems in major events 10:00 opening 16:10 Jürg Speerli (CH) 11:00 break Glyssibach Brienz, Switzerland: Flood and landslide of 22/23 August 2005, protective measures against future floods and landslides Keynote-Speakers Presentation: Maria Patek (AT) 16:30 break 17:00 VIDEO SESSION 11:30 Wolfgang Stalzer (AT) Alpenrhein: Attempt at sustainable development for the 18:00 Panel discussion largest wild Alpine river Presentation: Adi Fischer (AT, ORF Vorarlberg) 12:00 Bruno Merz (DE) Flood risk analysis: Uncertainties and validation Floods – not constant but constantly increasing? 12:30 Armin Petrascheck (CH) Experiences and measures in my field – responsible What kind of security do we promise for the protection people report from natural hazards? Maria Patek – Federal Ministry for Agriculture, Forestry, 13:00 lunch Environment and Water Management Kurt Rohner – Head of Department 18 – Water Manage- ment, Provincial Government of Carinthia SESSION I: Torrents Erich Schwärzler – Member of the Provincial Government Presentation: Aronne Armanini (IT) of Vorarlberg (responsible for torrent and avalanche control) 14:30 Masanubu Kimura (JP) Dieter Egger – Member of the Provincial Government of Bedload disaster by the “Rusa” typhoon after forest fires Vorarlberg (responsible for hydraulic engineering and on the east coast of the Republic of Korea water conservation) 14:50 Markus Stoffel (CH) Elisabeth Wicke – Mayor of an affected alpine munici- Land slide activities on a wooded peak of the Swiss Alps pality () since the late Holocene: Lessons from the past – conse- Thomas Eigstler – Mayor of an affected municipality at quences for the future Lake Constance (Wasserburg) 15:10 Christian Scheidl (AT) Depositing behaviour and range of Alpine landslides

8 9 Tuesday, 27th May 2008 Session III: Mass Movements Presentation: Andreas von Poschinger (DE)

SESSION II: Torrents 10:40 Ueli Gruner (CH) Presentation: Andreas Reiterer (AT) Climatic and meteorological influences on fall processes 11:00 Philippe Schoeneich (FR) 08:30 Gian Reto Bezzola (CH) A new database of Alpine rock falls and rock avalanches Unexpected processes in a bedload collector of the 11:20 Michael Mölk (AT) “Stiglisbrücke” bedload collector on the river “Schächen” Rock fall classification systems: Is there a suitable during the flood of August 2005 method for hazard zone planning? 08:50 Markus Moser (AT) 11:40 Falk Lindenmaier (DE) Numerical, hydrological and hydraulic simuation of the Hydrological patterns and processes of a deep seated effects of a possible flood wave in the course of risk creeping slope at Ebnit, Vorarlberg (AT) analysis and risk management at the “Suggadinbach” 12:00 Simonetta Cola (IT) creek Relevance of three-dimensional stability analysis for two 09:10 Marc Wenger (CH) landslides in the southern Italian Alps Hazard prevention using flexible multi-level debris flow barriers – protection against debris flows by the installation 12:20 lunch of 13 flexible barriers in the “Milibach“ river (Canton 14:00 poster presentation Berne, CH) 16:00 break 09:30 Roland Kaitna (AT) Optimisation of the Vorderbergerbach (AT) bedload depositing site SESSION IV: Avalanches and Protection Forest 09:50 Jürgen Suda (AT) Presentation: Christian Wilhelm (CH) Inspection and monitoring of protective torrent control installation in Austria 16:30 Stefan Magreth (CH) Consideration of the effect of protection measures in 10:10 break hazard maps: Procedure in Switzerland 16:50 Christian Rachoy (AT) Avalanche safety concept for a railway station in Austria Technical and temporary measures – a hazard analysis 17:10 Awarding of the Student Poster Award Presentation: Hans Kienholz (CH) 17:30 Serena Liener (CH) Simulation of hazard warning areas as a basis for protection forest qualification in Switzerland

10 11 17:50 Bernhard Kohl (AT) Thursday, 29th May 2008 Control of the surface runoff by means of site-optimised forest cultivation 18:10 Marzio Giamboni (CH) SESSION V: River Basin Management Improvement of the protection forest management in Presentation: Roberto Loat (CH) Switzerland – the Silvaprotect-CH project 20:00 Gala dinner 08:30 Stephan Schober (AT) Self-dynamic river-morphological processes in connec- tion with river expansion as a practical example of modern hydraulic engineering 08:50 Daniel Hersberger (CH), Martin Fritsch (CH), Jean- Wednesday, 28th May 2008 Louis Boillat (CH) 3rd river Rhone project in the Canton of Valais (CH) 8:00-20:00 Excursions (further information on page 18) Rhone correction: Aims, solutions and spatial development Integrated and participatory land-use management: The implementation of integrated land consolidation in the context of the 3rd river Rhone training project Model experiments of the Rhone at Visp (CH) – consider- ing several hydro-engineering aspects 09:30 Kimio Inoue (JP) Two large landslide dams and outburst disasters in the Shinano river, central Japan 09:50 Rainhard Pohl (DE) Risk assessment for a hypothetical dam burst

10:10 break

Session VI: River Basin Management Presentation: Thomas Blank (AT)

10:40 Nadine Hilker (CH) Storm damage in Switzerland 1972-2007 with particular consideration of the August 2005 flood 11:00 Michele Ferri (IT) River Brenta defence by controlled flooding

12 13 11:20 Dieter Vondrak (AT) SESSION VIII: Disaster Management River Dornbirnerach stream care concept, water Presentation: Stefan Kreuzer (AT) management results 11:40 Peter Mani (CH) 16:10 Christoph Hegg (CH) An early warning system for lake Thunersee, hydro- Event analysis of the 2005 flood in Switzerland meteorological indicators for the operation of a discharge 16:30 Rene Graf (CH) outlet in Thun Weather alarms – a challenge for effective intervention, a 12:00 Heinz Stiefelmeyer (AT) practical contribution from central Switzerland HORA – an Austrian platform for natural hazards as a 16:50 Hanspeter Staffler (IT) new way in risk communication Organisation of the operation planning in the department for Flood Protection Structures of the Autonomous 12:20 lunch Province of Bolzano – South Tyrol during flood events 17:10 Thomas Plattner (CH) Incident-oriented emergency planning as an instrument Session VII: Risk Management of the task forces in the event of natural hazards Presentation: Markus Zimmermann (CH) 17:30 Hans Romang (CH) Tools for the accomplishment of flood and landslide 14:00 Josef Hess (CH) events in smaller catchment areas Protection goals dealing with natural hazard changes on the path of justice 14:20 Dieter Rieger (DE) 2D-modelling of flood plains with optimised input data – large-scale application and communication strategies 14:40 Tharan Fergus (NO) Integration of flood risk information into land-use planning in Norway 15:00 Verena Adam (CH) Efficiency test of disaster management – a comprehensive approach to testing the effectiveness, efficency and adequacy of disaster management during floods for Austrian municipalities 15:20 Pierre Vanomsen (CH) Vulnerability of buildings and effectiveness of property protection measures

15:40 break

14 15 Friday, 30th May 2008

08:30 OPEN SESSION: Alpenrhein

Presentations: Benno Zarn Development Concept River Alpine Rhine Therese Bürgi Operational Flood Forecasting for the Swiss River Rhine Basin Hans Peter Wächter The System „Protection of the Population“ in the Canton St.Gallen and the transnational co-operation in the Rhine Valley in regard to national phenomena

Afterwards Alpenrhein citizen platform Presentation: Adi Fischer (AT, ORF Vorarlberg)

Speakers: • Herbert Sausgruber Governor (Province of Vorarlberg and IRKA) • Heinz Stiefelmeyer Chairman of the Joint Rhine Commission (AT) • Andreas Götz Representative of the International Rhine Regulation (CH) • Therese Bürgi • Benno Zarn • Hans Peter Wächter

11:00 End

Friday midday to Sunday post-congress excursions (further information on page 28)

16 www.interpraevent2008.atwww.interpraevent2008.at 17 Excursions Excursion 2 Flood protection measures at Lake Constance, Bregenzerache and Ill Excursion 1 Entwicklungskonzept Alpenrhein Excursion route: Dornbirn – Hard – – Au – Faschinajoch – – – Dornbirn Excursion route: Dornbirn – mouth of the Alpine Rhine (Alpen- rhein) into Lake Constance – confluence of The flood events of 1999 and 2005 caused enormous damage in Vorderrhein and Hinterrhein in Chur – Dornbirn Vorarlberg and initiated a series of protection measures. This ex- cursion leads from Lake Constance – into which most bodies of Since 1892, works on the Alpine Rhine for the improvement of flood water of the province of Vorarlberg flow – to the problematic points protection have been carried out in three phases. The basis for this of the tributaries. All protection measures were directly prompted by were the international treaties of 1892, 1924 and 1954 between the events which unsparingly showed existing protection deficits. Swiss Confederation and the Republic of Austria (or the Empire of Austria as it was once known). Since the last improvement, the Apart from measures against the uncontrolled overflowing of Lake Rhine Valley has not been devastated by any major flood. The cur- Constance in Hard, problematic points and problem solutions at rent expansion water quantity corresponds to a 100-yearly event and the Ill in the area of Feldkirch and Frastanz will be viewed and the amounts to 3100 m³/s. evacuation of the Schildried plot in Göfis in favour of integral flood protection will be discussed. As a consequence of economic growth, the settlements in the Alpine Rhine Valley were enormously extended and big values were created. In the area of Au, Mellau and Bezau, flood protection measures The Rhine was canalised in the broadest sense; its flume is not up following the flood event of 2005 of the Bregenzerache river will be to the current state of demands on water ecology. In addition, it is discussed. impaired by a surge as a result of power plant utilisation.

The neighbouring municipalities and cantons (Austria, Switzerland, Liechtenstein and the province of Vorarlberg, canton St. Gallen and canton Graubünden) have decided to draw up the Alpine Rhine de- velopment plan within the framework of the Alpine Rhine International Governmental Commission.

On the occasion of this excursion, the procedures and results of the development plan are to be presented. On this excursion, several potential solutions will be shown and explained in the great outdoors.

18 19 Excursion 3 the Ill river. On the occasion of the flood in August 2005, for example, Slide phenomena in the Principality of Liechten- the peak run-off of the Ill in the area of Feldkirch could be reduced stein (Schlucher gypsum subsidence – Malbun / by approx. 100 m³/s and thus the part flooding of Feldkirch could be Triesenberg major slide) prevented. The natural affluents to the reservoirs of the Illwerke power plants are retained there even in high water. This way, the hydroelec- Excursion route: Dornbirn – Vaduz (stop at the Rhine dam: tric power plants make a considerable contribution to damage reduc- counter slope inspection) – Malbun (Schluch- tion in high water events by means of high water retention and cutting er gypsum subsidence) – Triesenberg (major peak run-offs. slide) – Dornbirn In the course of the excursion, important installations of the Vorarl- In the Principality of Liechtenstein considerable parts of the set- berger Illwerke AG will be shown and their possibilities for flood re- tlement area are threatened by slide processes. Dealing with slide duction will be reviewed. Energy problems and structural problems phenomena will be shown on the example of the Schlucher gypsum (Kops II cavern) will be discussed in the course of the visits to the subsidence above the locality of Malbun and the Triesenberg major power plants. slide which are slides with completely different characteristics. The geological analysis of the slides as well as the risk assessment de- rived from it make up the focus of this excursion. By means of the Excursion 5 visited properties, the prevention of hazards in the sense of an in- Effect and assessment of the forest as rockslide tegral measure plan will also be argued. Starting from the current protection in the process understanding, the newly initiated protective measures will be discussed on the occasion of this excursion. To what extent slide Excursion route: Dornbirn – Gaschurn – Dornbirn processes of this dimension have to be taken into consideration in spatial planning will be explored in conclusion. In this excursion we will present and discuss the integration of topog- raphy elevation, process simulation and forestry for the optimisation of the protective function against rockslides. In doing so, we will look Excursion 4 into the question of how it is possible to get from understanding the Flood influence by the reservoirs of Vorarlberger problem in the terrain and using modern aids (simulation and laser Illwerke AG in the Upper Ill – Lünersee power plant scanning data) to defining adequate protective constructions and cul- group tivation measures in the forest.

Excursion route: Dornbirn – – Partenen – Bielerhöhe – Furthermore, the deduction of protective measures on the basis of Kops – Dornbirn the terrain findings and simulation results will be illustrated. In doing so, both technical structures (torrent regulation and avalanche barri- Within the power plant operation (turbining-pumping), the Vorarlberg- ers) and forestry possibilities (forester service) for the optimisation of er Illwerke AG uses the water resources from the Ill and its tributar- the protective function will be touched upon. ies. In the case of high water, the pumping intake performance of the power plants of about 1 gigawatt enables cutting the peak flows of

20 21 Excursion 6 measures that were taken in the Steigbach brook for runoff optimisa- Protection from natural hazards by the ecosystem tion in the urban area will be presented. forest The Weidachwiesen polder, which was constructed within the scope Excursion route: Dornbirn – – Balderschwang – Ober- of the Upper Iller flood control project, will be presented as an im- maiselstein – Hittisau – Dornbirn provement of flood protection for the towns and municipalities in the Upper Iller Valley. The polder is controlled and has a retention volume The protection forest management in Bavaria will be presented by of approx. 6 million m3. means of the “Balderschwang” (Bavarian State Forest – Sonthofen forest holding) and “Hennenbrunnen” (Office for Agriculture and Forestry, Kempten – authority for protection forest management in Excursion 8 Allgäu) protection forest projects. The cultivation of mixed mountain Integral Natural Hazard Risk Management of forests, both in flysch and helveticum, for erosion prevention and wa- St.Gallen ter retention on the one hand and for the protection from avalanches and rockslides on the other hand will be presented in practice. Spe- Excursion route: Dornbirn – Rüthi – Weisstannental – Dornbirn cial emphasis in these projects is placed on the regeneration of mixed mountain forests with the aim of planting spruce-fir trees with decidu- The Rhine Valley Inland Canal [Rheintaler Binnenkanal (RBK)] was ous trees (beech and precious hardwood) as well as on structural constructed between 1894 and 1904 and served for the drainage care. The installation of temporary structures (tripod trestles) for the of the marshland in the Rhine Valley. Flood events in the 1980s, but protection of plantations in gliding snow areas as well as a hunting particularly those in the years 1999 and 2000, have demonstrated plan round off the protection forest plan. that this inland canal in the settlement area of Rüthi is no longer ca- pable of harmlessly draining off the accumulating water. By means of the “Rhine Valley Inland Canal – flood protection and ecology in Excursion 7 harmony” project, priority flood protection for the settlement area is Different protective measures against slide and flood to be sustainably guaranteed. Furthermore, the monotonous canal is in the area of the town of Immenstadt im Allgäu to be redesigned into a near-natural body of water by means of the redevelopment plan so that enough room is available for both nature Excursion route: Dornbirn – Hittisau – Aach – Oberstaufen – and people seeking recreation. Immenstadt im Allgäu – Dornbirn In the Weisstannental Valley, the necessary measures (spatial plan- In spring 2006, a slide came off from the flank of the Immenstädter ning measures, property protection measures, technical measures and Horn, moved forward as far as the Steigbach brook that runs along emergency measures) were to be laid down and the priorities were the cleft and thus constituted a major threat for the urban area ly- to be set by means of a comprehensive risk analysis regarding per- ing below the river. As a stabilisation of the slide is impossible, there sonal injury and property damage per possible damage object and per is only the strategic possibility to cultivate the landslide in order to source of hazard. Both the municipality and the affected citizens were prevent secondary effects. The measures taken for the protection of involved in the processes. In the excursion, these measures will be the town of Immenstadt will be inspected on site. Afterwards, further explained on site and can then be discussed among the participants.

22 23 Excursion 9 Excursion 10 Integral avalanche protection in Davos and Klosters Natural hazards management in urban areas on the example of the town of Dornbirn Excursion route: Dornbirn – Klosters – Davos – Dornbirn Excursion route: Town area of Dornbirn In the morning, the topic of natural hazard management in canton Graubünden will be dealt with. Graubünden has a long experience By means of the biggest town of Vorarlberg, capital Dornbirn, in dealing with natural hazards and has been implementing owner- the direct influence of natural hazards on settlement development and binding hazard zones in any of its 208 municipalities for about 30 administration will be demonstrated. Of course, the focus of attention in years. The implementation is ensured by cantonal hazard commis- the urban agglomeration is on traffic and economy, but it is unbelievable sions. The fundamental instruments of modern risk management how natural hazards can have effects that reach so far into the town cen- (event registers, hazard maps, protective construction registers, etc.) tres.Apart from a range of hazard causes such as rockfalls, rockslides, will be demonstrated on the example of the municipality of Klosters. slides, avalanches, torrents and rivers, the comprehensive safety man- Based on risk interpretation by means of GIS evaluations throughout agement of the town of Dornbirn will be presented, ranging from disaster canton Graubünden, the consistent priorisation of protective meas- precautions and coping with the disaster to the removal of damages. ures will be explained. Based on this, the importance of the hazard processes (avalanche, flood, slide and rockslide) in the municipality The excursion programme includes the visit to protective structures of Klosters will be addressed. and the viewing of automatic measuring systems and warning de- vices. The visit to some relief organisations (fire brigade, sandbag In the afternoon, the SLF in Davos will be briefly presented. It filling plant) rounds off the schedule. was already in 1936 in a wooden hut on the Weissfluhjoch that 7 researchers began to tackle the question of why a snowflake The variety of natural hazards and the measures currently in progress becomes an avalanche. Since then, an internationally renowned in Dornbirn will be presented to the participants. Furthermore, an ex- research institute based in Davos Dorf has developed from these change of experiences is sought after in order to be even more suc- modest beginnings. The days when only avalanches were inves- cessful in future when working together. tigated are long gone. Today also other natural hazards such as slides, rockslides and landslides are studied. The SLF employs about 120 people today.

24 25 Excursion 11 Excursion 12 Practical examples of avalanche hazard manage- Technical protective measures in torrents managed ment in /Arlberg by the torrent and avalanche control, regional construction management Excursion route: Dornbirn – Bludenz – Lech – Warth – Bregenzer- wald Bundesstraße road – Dornbirn Excursion route: Dornbirn – Bludenz – Bürserberg – Braz – Dornbirn At the beginning of the excursion, avalanche protection measures and diversion dams in Stuben on Arlberg will be viewed and explained. The district of Bludenz in Vorarlberg has a range of powerful and The locality of Stuben is threatened by numerous avalanches. known torrent basins. The location open to the west with an oceanic climate provides for frequent heavy precipitation and, as a rule, the Then the trip continues on to Lech. The municipality is threatened torrents have short, steep courses and thus a high degree of relief by numerous natural hazards, in particular by avalanches. The aim energy. Unstable geological conditions of the bedrock and huge qua- of the excursion is to refer to the consequences of the new Austrian ternary deposits provide large amounts of debris and bedload. guidelines on hazard zone planning. The comparison of old and new zone boundaries, the use of simulation methods and the influence of Then the Schesa will be viewed, a river basin from which for about social changes give an impression of the possibilities and challenges 200 years more than 50 million m³ of landslide material has come of modern hazard zone planning methods. On a short hike, technical to the alluvial cone and into the Ill receiving stream. Although mas- protective measures such as steel snow bridges, snow fences and sive structures have been built to stabilise the impressive break-off suspended cross beams will be viewed. Furthermore, the automatic basin for more than 100 years, the Schesa still constitutes a serious avalanche trigger station “avalanche control” will be demonstrated threat for the settlement area. The current redevelopment plan of ac- (artificial avalanche trigger). tive rebanking with building material extraction will be presented and discussed. At the end, the Austrian avalanche prediction system ADS will be pre- sented. ADS (developed by BFW) combines data-based and physical The second excursion is to the Braz torrents that brought extreme prediction models and is also used for the documentation of artificially landslides to the settlement area in 1995. Whereas the structures and naturally triggered avalanches. It concentrates all information that were fully effective and largely protected the settlement area, a fateful is necessary for the assessment of the danger of avalanches “in time” disaster occurred in the Masonbach brook which involved an express and diagnoses the current risk of avalanches. train and regrettably claimed 3 lives. The event and the protective measures will be presented and discussed in this excursion.

26 11th Congress Interpraevent 26th to 30th May 2008 www.interpraevent2008.at 27 Post-Congress Excursions Registration deadline: 10th May 2008 (registration form on page 30)

Bregenz – Lake Constance Säntis (CH) – Principality of Liechtenstein Date: Friday, 30th May 2008 Date: Sunday, 1st June 2008 Half-day trip: 1:30pm - 5:30pm Day trip: 9:00am - 5:30pm Min. number of participants: 15 persons Min. number of participants: 15 persons All-inclusive price/person: EUR 38,00 All-inclusive price/person: EUR 80,00 Programme: • guided tour of Bregenz Programmpunkte: • Schwägalp alpine exhibition cheese dairy • round boat trip in the Bregenz Bay • Säntis • Principality of Liechtenstein With the cable railway you will reach the summit of the Säntis at 2,501 m altitude.

Don‘t forget your passport!

Feldkirch – Arlberg – Bregenzerwald Date: Saturday, 31th May 2008 Day trip: 9:00am - 6:00pm Min. number of participants: 15 persons All-inclusive price/person: EUR 50,00 Programmpunkte: • guided tour of Feldkirch • visit to the avalanche barrier project Hochtannberg and • the torrent regulation project

For details see: www.interpraevent2008.at

28 29 Registration for the Participation fees: Post-Congress Excursions Congress fee: EUR 450,00 Please send the filled in form by 10th May 2008 at the latest to Congress fee for students: EUR 200,00 Convention Partner Vorarlberg: The congress fee includes: participation in the congress, Fax: +43 (5574) 43443-4 congress programme, congress proceedings (3 volumes + E-Mail: [email protected] CD-ROM), coffee break

I/We register bindingly for the following excursion/s: Lunch: EUR 57,00 3 lunches (Monday, Tuesday, Thursday) with international 4-course set meals incl. drinks Bregenz – Lake Constance EUR 38,00 Persons Gala evening (Tuesday): EUR 58,00

Feldkirch – Arlberg – Bregenzerwald Helicopter exploration flights to topic-related destinations: EUR 140,00 EUR 50,00 Persons Monday, Tuesday and Thursday from 5 pm approx. 20-25 minutes, daily max. 20 people Säntis (CH) – Principality of Liechtenstein you will be told the flight day and time at the information EUR 80,00 Persons desk on site

Excursions: EUR 60,00 Mr Mrs Title: As the excursions take place simultaneously, only one First name: last name: registration for one excursion can be made per person. If registration for your desired excursion is not possible, it is Company: already fully booked (max. 50 people). Please select an alternative excursion. Street: NOTE: Please note the entry visa requirements of some countries (Switzerland, Liechtenstein). Town/Country:

Phone: Congress and hotel booking: Fax: Online registration at: www.interpraevent2008.at

E-Mail:

Signature: Prices including VAT.

30 31 ✁ Partners: