Book excerpt: This book provides an independent and comprehensive review of World Bank irrigation lending and policy between 1948 and 1993. The Bank's role in irrigation lending has been large--more than $30 billion (in current U.S. dollars) spread over some 600 projects. Only 200 projects have been in place long enough to be assessed. The overall performance record is good, but there is room for improvement. The report finds that there are still pervasive problems in maintenance and operation. Operating chaos prevails in most large canal systems in the humid tropics. In drier areas, drainage is the biggest environmental problem associated with irrigation. The author argues for upgrading existing systems, improving service, involving irrigators, and saving water where it is scarce.