Join the team of engineers that is racing to save the city of Venice. People and places - Physical geography - Floods Learning Points Flooding can affect the land around rivers, and also coastal areas. Flooding can be caused by climate change, for which humans are partially responsible. Flood defence systems reduce the risk of flooding. A Twig Context Film. Reinforce and extend the learning required by the curriculum. Twig’s context films show abstract concepts in action in the real world.