Only 5%–10% of irrigated lands in least developed countries (LDCs) are currently drained. Although drainage simulation models (DSMs) are used to evaluate alternative designs, it is unclear which drainage model is suitable for LDCs' arid and semi-arid regions. This study evaluates selected DSMs (ADAPT, RZWQM2, DRAINMOD, EPIC, HYDRUS-1D, WaSim and SWAP) and critically assesses their applicability to arid and semi-arid areas. Also, establish and apply selection criteria based on the availability of data in LDCs with Libya as a case study, and identify the most suitable model for application in Libya. DRAINMOD had the highest overall score, and alternative methods to predict missing input parameters for DRAINMOD are discussed. Evaluating the feasibility of using predicted input parameters for DSMs to design drainage systems in LDCs would help farmers, planners and decision-makers to reduce the overall cost of drainage system and, also, make DRAINMOD a more accessible tool to evaluate different drainage designs.

中文翻译：

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排水模型：评估干旱地区排水系统设计的适用性

最不发达国家 (LDC) 目前只有 5%–10% 的灌溉土地被排干。尽管排水模拟模型（DSM）用于评估替代设计，但尚不清楚哪种排水模型适合最不发达国家的干旱和半干旱地区。本研究评估了选定的 DSM（ADAPT、RZWQM2、DRAINMOD、EPIC、HYDRUS-1D、WaSim 和 SWAP），并严格评估了它们对干旱和半干旱地区的适用性。此外，以利比亚为案例研究，根据最不发达国家的数据建立和应用选择标准，并确定最适合在利比亚应用的模型。 DRAINMOD 的总体得分最高，并且讨论了预测 DRAINMOD 缺失输入参数的替代方法。评估使用 DSM 的预测输入参数来设计最不发达国家排水系统的可行性将有助于农民、规划者和决策者降低排水系统的总体成本，并使 DRAINMOD 成为评估不同排水设计的更容易使用的工具。