Ladysmith, a small city in KwaZulu-Natal (South Africa) had to deal with severe floods in the past. To prevent the city against floods like this, the Ladysmith Flood Protection Scheme was implemented in 1998. After the implementation of this scheme, there were still some floods. The goal of this project is to identify the causes of the floods after the implementation of the scheme. After analysing several factors, doing some fieldwork and modeling the river system and drainage system it turned out that the floods are mainly caused by the drainage system. There is a lot of garbage in the system, and the stormwater valves aren’t working in the way they should. Some adaptations should be done to prevent the city against future floods.