The International Commission on Irrigation and Drainage (ICID) regularly updates the areas drained and irrigated in the world based on information provided via their national committees (www.icid.org). Modern land drainage planning, design and implementation include making drainage environmentally sustainable and achieve this through enhanced water balance assessments at regional and field scale, prevent excess water except for leaching salts, support ecological water requirements, and then, if any excess water remains, design a drainage system. The less water mobilized through the root zone, the better the quality of drainage water. No matter how efficiently our crops are watered, sooner or later we need to have a well‐functioning drainage system for complete in‐field water management. Agricultural land drainage should include various approaches to assessment and prevention of waterlogging and salinity problems, consider the water–food–energy nexus approach and give due attention to social, environmental and financial considerations (triple bottom line, TBL) for the best sustainable results. The most important consideration to be included in drainage system planning and design is the consideration of cause and effect. Waterlogging and salinity problems are the effect of something that is occurring most likely upstream; the cause. © 2020 John Wiley & Sons, Ltd.

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与ICID愿景2030有关的排水现状和未来前景

国际灌溉排水委员会（ICID）根据其国家委员会（www.icid.org）提供的信息，定期更新世界上的排水和灌溉区域。现代土地排水的规划，设计和实施包括使排水在环境上可持续，并通过在区域和田地范围内加强水平衡评估来实现这一目标，防止淋溶盐以外的多余水，支持生态需水量，然后（如果有剩余水的话）设计排水系统。通过根部区域流动的水越少，排水水的质量就越好。无论我们的作物浇水效率如何，迟早我们都需要有一个运转良好的排水系统，以实现完整的田间水管理。农业土地排水应包括各种评估和预防涝灾和盐碱化问题的方法，考虑水，食物，能源的联系方法，并充分注意社会，环境和财务方面的考虑（三重底线，TBL），以取得最佳的可持续效果。排水系统规划和设计中最重要的考虑因素是因果关系。内涝和盐度问题是最有可能在上游发生的事情的影响；原因。分级为4 +©2020 John Wiley＆Sons，Ltd. 排水系统规划和设计中最重要的考虑因素是因果关系。内涝和盐度问题是最有可能在上游发生的事情的影响；原因。分级为4 +©2020 John Wiley＆Sons，Ltd. 排水系统规划和设计中最重要的考虑因素是因果关系。内涝和盐度问题是最有可能在上游发生的事情的影响；原因。分级为4 +©2020 John Wiley＆Sons，Ltd.