This book is focused on the current conditions of water crisis in urban areas and the strategies of adaptation to secure water for achieving Sustainable Development Goal 6 (SDG 6). Many global cities are facing a drastic water crisis due to overexploitation, declining groundwater, pollution, poor water supply infrastructure, contamination, inadequate water supply, and poor treatment processes. These problems have proved to be a significant barrier against achieving SDG 6. This book addresses potential solutions to the above problems and the strategies of adapting climate change to secure water in urban areas. The major topics covered here are; global urban water crisis, climate change-based water related challenges, barriers of climate change adaptation, contamination of urban water supply, strategies of climate change adaptation to secure water, urban water resource management, development of green infrastructure for securing water, sponge cities, restoration of aquatic ecosystems, rainwater harvesting, constructed wetlands, etc.  This book provides solutions to the urban water crisis and the climate change adaptation strategies to overcome these issues in the future.