The Kander correction was the first pieces of major water course re-engineering in Switzerland and lack of experience subsequently led to problems. The amount of water flowing into Lake Thun was increased by 60%, with a commensurate increase in outflow through the city of Thun. This caused flooding and bank correction, which has been addressed over the years in different ways, including channeling of the Aar in 1716, a more major correction of the Aar in the 1870s, and a flood relief tunnel in the early 21st century.