The document discusses the increasing risk of heavy rainfall and flooding in Amsterdam due to climate change. Short, heavy downpours known as "cloudbursts" are becoming more common, overwhelming sewer systems and causing major damage. To prepare for this new reality, Amsterdam is working to become "Rainproof" through a range of solutions like green roofs, retention ponds, permeable pavement, and designing projects to better manage stormwater runoff. The goal is for Amsterdam to be ready to safely handle intense rainfall through collaboration across sectors on both new developments and existing neighborhoods.