This is one of a number of PLOW learning resources designed to support the professional development of DFID livelihoods advisers. Each learning resource comprises an overview of the subject in a briefing note; key texts; a summary of recent policy debates; points on where to find other resources; and a glossary of key terms used in the briefing note. This briefing note sets out some of the critical issues and key references for an introduction to water resources, particularly in the context of livelihoods. This resource was produced by the Programme of Advisory and Support Services (PASS) in partnership with Livelihoods Connect at the Institute of Development Studies (IDS). PASS was a Resource Centre for Livelihoods Advisers that was funded by DFID and managed by HTSPE Limited. The Resource Centre closed in 2007.