Normal
When we last cruised on the Danube, Viking River Cruises was dealing with this. They were unable to pass a certain point in the river. So they often took passengers to this spot and transferred everyone from one vessel to the other and the people on the other moved to the ones the people had just left on the other side of the low spot. I have also heard of people being bussed to the different ports of call but, still staying onboard the cruise ship over night. So they are very good at this.Here are some article I found on this subject for more reading:https://www.rivercruiseadvisor.com/water-levels/https://www.cruisecritic.com/articles.cfm?ID=1522http://riverboatratings.com/will-anyone-tell-us-when-to-avoid-river-cruises-in-europe/http://www.travelweekly.com/Richard-Turen/River-cruisers-need-facts
When we last cruised on the Danube, Viking River Cruises was dealing with this. They were unable to pass a certain point in the river. So they often took passengers to this spot and transferred everyone from one vessel to the other and the people on the other moved to the ones the people had just left on the other side of the low spot. I have also heard of people being bussed to the different ports of call but, still staying onboard the cruise ship over night. So they are very good at this.
Here are some article I found on this subject for more reading:
https://www.rivercruiseadvisor.com/water-levels/
https://www.cruisecritic.com/articles.cfm?ID=1522
http://riverboatratings.com/will-anyone-tell-us-when-to-avoid-river-cruises-in-europe/
http://www.travelweekly.com/Richard-Turen/River-cruisers-need-facts