After air, water is the most essential element for life. Climate change is impacting weather patterns with more, heavy rainstorms and longer hot dry periods exposing us to both flooding and drought. Some parts of the UK are severely water challenged. How we manage our water and especially our urban water is a major challenge. We cannot continue to use water as freely in some places, we need to consider natural flood management upstream to avoid downstream (urban) flooding, and we need to focus on sustainable drainage systems (green-blue infrastructure) to manage urban surface water. We need to treat water as a precious resource in our decision making. This new TDAG guidance outlines how this can be done.