This book explains irrigation methods and their variation and provides information on what elements to take information on what elements to take into consideration before choosing any method. Methods of irrigation outlined include surface irrigation, drip-macro irrigation, sprinkler irrigation, and sub irrigation. Each method is discussed in terms of capabilities and limitations, institutional considerations, and economic factors, taking into account crop, climate, economics water quality, support infra-structure, and energy availability This book draws together the knowledge that has been gained in irrigation and drainage performance assessment over the last 10 to 15 years. Performance assessment is an essential management task. If the use of water for irrigation is to be improved then one must understand current levels of performance and identify measures for improvement. This book provides guidelines to enable practitioners to apply the process and procedures that have evolved. This book will be of interest to researchers and professionals in irrigation, drainage, soils and agricultural engineering.