Basic water security, the ability both to harness the productive potential of water and to limit its destructive impacts, is essential to mitigate risk, alleviate poverty and enable growth. Historically, this has required a minimum platform of infrastructure, institutions, governance and human skills for water management at all levels. This book explores the dynamics of water security and growth, and seeks lessons of experience that can inform the difficult trade-offs inherent in water management. It will also assist decision makers in finding the most acceptable balance among human aspirations for growth and poverty alleviation, social and cultural integrity, and environmental sustainability.