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Agricultural drainage water management in arid and semi-arid areas
This publication focuses on the management of drainage water from existing drainage systems located in irrigated areas in arid and semi-arid regions. This publication consists of two parts. Part I provides the framework and technical guidelines on the drainage water management measures for decision-makers, planners and engineers. After the introduction (Chapter 1), Chapter 2 presents guidelines for defining the problem and alternative approaches in seeking solutions. Chapter 3 provides a framework for the selection and evaluation of drainage water management options. Chapter 4 deals with factors affecting drainage water quality. Chapters 5 to 8, respectively, present the guidelines and details on each of the four options related to water conservation, drainage water reuse, drainage water disposal and drainage water treatment. It is beyond the scope of this publication to provide technical details and guidelines to prepare detailed designs. Design engineers may refer to the numerous references provided later in the text. Part II presents summaries of five case studies from India, Pakistan, Egypt, the United States of America, and the Aral Sea Basin. They illustrate how various countries or states deal with the issue of drainage water management in the context of water scarcity, both in quantitative and qualitative terms, under differing degrees of administrative and policy guidelines and regulations as well as differing degrees of technological advancements and possibilities. The attached CDROM contains the full text of these case studies.