If the Soyhières gauge is rising through 100 cumecs, this is an approximate indicator that Münchenstein, Hofmatt could reach 120 cumecs in about 3 hours.

https://www.hydrodaten.admin.ch/en/2478.html

For a BAFU alarm send an SMS to number 9234, with the message body

START Q 2478 ALARM 100.0

https://www.bafu.admin.ch/bafu/de/home/themen/wasser/zustand/daten/messwerte-zum-thema-wasser-beziehen/aktuelle-hydrologische-daten-beziehen.html

13.06.2018
High of 185 m³/s, dropping through the day.
The callibration worked perfectly.

15th August 2010
https://www.youtube.com/watch?v=qeUYZf1jkd4

This wave only appears at flood levels, which bring wood of all shapes and sizes down the river. This is particularly true when the river is rising or just after the peak.

Full-size logs are to be expected. Partial trees complete with branches are not unknown. Very occasionally so much wood arrives that the river becomes unusable for many minutes.

At Joggeli it is impossible to see upstream from the bottom of the wave while surfing, and visibility is marginal (at very best) from the top of the wave.

Please take one less risk. Everyone bring a whistle. Organize the group so that paddlers waiting upstream will warn the surfing paddler about approaching wood.

120 cumecs (dropping) at Birs - Münchenstein, Hofmatt. Est 110 cumecs at the wave.

A steep surging wave with a violent foam pile.

The wave starts to green out more frequently once the level drops below (say) 110 on the gauge.

Fast, long boats can front-surf down to about 90 cumecs.