River waves · Case studies
Case study Almkanalwelle Salzburg: 90,000 euros, timber ramp, city as operator
The Almkanalwelle in Salzburg-Gneis is the counterpart to the million-euro projects: a timber ramp in a 900-year-old canal, built and operated by the city, freely accessible to everyone. It is the oldest artificial river wave in Austria and the model for the project in Steyr. Profile and location: Almkanalwelle in the wave directory.
At a glance
| Watercourse | Almkanal, canal km 5.76, Gneis district; regular discharge around 5 m³/s |
|---|---|
| Construction | drop step of a former flood relief sluice; smooth ramp with channel widening, two adjustable spoiler boards, stilling basin 15 × 8 m |
| Width | 4 to 4.5 m (figures vary), wave height around 0.5 m |
| Costs | 90,000 € (construction 2010) |
| Funding | City of Salzburg |
| Operator | City of Salzburg; use free of charge, no club needed |
| Operation | since 24 September 2010, all year except three weeks of "Almabkehr" in September |
Timeline
The Almkanal is a hydraulic structure from the Middle Ages: the Stiftsarm tunnel was built between 1136 and 1143, the cut to the Königsseeache in 1286; today a waterworks cooperative operates the 12-kilometre main canal. At a flood relief sluice in Gneis, the City of Salzburg converted the drop step into a training wave in September 2010 during the Almabkehr – the annual draining of the canal. On 24 September 2010 it was flooded for the first time. Originally intended as a roller for kayakers, the wave was soon taken over by surfers. In 2011 followed the relocation of the cycle path, changing rooms and toilets, a fish pass required under water law and further adjustments; the official opening was in August 2011, with Austria's first inland surf contest. In 2016 the city set the tailwater spoiler steeper and dredged the canal bed upstream to reduce the backwater. In 2017 the club Riversurfing Austria was founded as an interest group.
Technology
The wave lives from the natural gradient of the canal: a smooth ramp accelerates the water, in a stilling basin it meets slower water and forms the standing wave – following the model of Munich's Eisbach. Two movable timber boards ("spoilers") shape the wave; their adjustment is secured with a lock, and individual representatives of the surf scene hold the key. The hydraulic design, with 2D modelling of various ramp geometries, was carried out by DonauConsult together with the engineering firm Gostner & Aigner; the client was the city's Magistratsdirektion. The flow of around 5 m³/s is constant because the Almkanal is a regulated watercourse – the wave therefore runs all year round, with the exception of the three-week Almabkehr in September, when the canal is dry and volunteers maintain the ramp.
Costs and funding
90,000 euros in construction costs, paid by the City of Salzburg, which also operates the wave. Neither the state nor the Almkanal cooperative, a club or sponsors appear as funders. The costs of the improvements in 2011 and 2016 have not been published. The order of magnitude is remarkable: a fixed timber ramp in a regulated canal with constant discharge costs a fraction of a hydraulically adjustable steel installation in a river. → Costs and funding
Permits and procedure
Little is documented: the fish pass of 2011 was a water-law condition, and a kiosk at the wave was rejected because of the nature reserve. The fact that the city itself was the client explains the lean procedure – there was no external applicant on whom the authority would have had to impose conditions.
Operation
There is no operating club and no slots: the city provides the wave, surfing is at your own risk and in daylight, according to the rules of the surf scene (no leash, quiet in the evening, no parking on the bridge). The annual maintenance during the Almabkehr is done by a volunteer team together with the Almmeister (canal master). The scene is small – reports in 2012 and in 2026 alike put it at 20 to 30 active surfers – but the oldest in Austria, and the wave serves as the model in the documents of the Steyr project: "approx. 4.5 m wide, corresponds roughly to the Almkanalwelle in Salzburg".
What Winterbach can learn from it
Salzburg shows what a regulated, constant discharge is worth: the wave needs no adjustment mechanism because the water always flows the same way. The Rems is a natural river with a fluctuating discharge, so the model cannot be copied – but the cost logic applies: the more stable the conditions and the simpler the ramp, the cheaper. Two further points can be transferred. A municipality can be client and operator if it understands the wave as a public sports facility – that is a different model from the club operation in Germany. And use at your own risk without slots works for a small, calm wave; with greater demand and a more powerful wave, all newer installations rely on supervision.
Frequently asked questions
What did the Almkanalwelle cost and who paid?
90,000 euros for the construction in 2010, funded and since then operated by the City of Salzburg.
Can anyone surf the Almkanalwelle?
Yes, free of charge and without membership, at your own risk and in daylight. There are no slots; the scene regulates itself through etiquette.
Why does the wave run all year round?
The Almkanal is a regulated watercourse with a constant discharge of around 5 m³/s. Only during the Almabkehr in September, when the canal is dry for three weeks, does the wave stand still.
Sources: almkanal.at, "Projekt Surfwelle" · City of Salzburg, "Almkanal" and notice of 03.06.2016 · DonauConsult, reference Almkanal · meinbezirk.at, 17.08.2011, 06.06.2016 and 29.07.2024 · SalzburgerLand Magazin, "Almkanal-Welle" (2012) · Riversurfing Austria, spot Almkanal-Welle and wave maintenance · salzburg.info, "Surfing wave on the Almkanal" · LEADER Tourismusverband Alpenvorland, "Flusswelle Steyr" · Wikipedia, "Almkanal"
Last updated: 15 October 2026 · Initiative Remswelle