Climate change results, natural hazards in the region of Gdańsk (northern Poland). Zulawy region and Gdansk itself for ages suffered from flood which came from different directions. Inundation of big areas created a lot of losses in infrastructure and agriculture. That’s why it was necessary to develop flood protection to secure inhabitants, industry and agriculture. Heavy rainfall which is more frequent now caused the construction of artificial reservoirs and monitoring system. Numerical modelling of the Gdansk catchment made possible to simulate different scenarios in order to take necessary action to prevent inundation. As to Zulawy region, there is a Programme for Zulawy to 2030 aiming not only to improve flood threat identification, flood control and flood risk management but also reconstruction and construction of water engineering facilities.