Rainwater harvesting has been recognized as an alternative water supply method with many environmental benefits. This method can also produce drinking water for people who cannot access safe water resources. In this study, we evaluate the newly developed rainwater for drinking (RFD) system built at Ly Nhan Hospital in Vietnam. Most evaluation methods are not suitable for the RFD system because they focus on given conditions and overlook the potential of the system via operation and management practices. The hydrological performance was evaluated based on the system supplying drinking water sustainably, with zero no water days and a rainwater utilization ratio of 22%. Methods for improving performance indicators under adverse conditions were determined using sensitivity analysis and include increasing catchment area and tank volume and maximizing water use by utilizing rainwater overflow. Among them, an additional tank should be prioritized considering the cost, or it can be replaced by a plastic bag. The RFD system can be designed based on system monitoring data despite a lack of daily rainfall data and unexpected changes in the conditions. Appropriate regional RFD guidelines can be established with the continued evaluation of the RFD system worldwide.

雨水收集已被认为是一种具有许多环境效益的替代供水方法。这种方法还可以为无法获得安全水资源的人们提供饮用水。在这项研究中，我们评估了在越南Ly Nhan医院建造的新开发的饮用雨水（RFD）系统。大多数评估方法不适用于RFD系统，因为它们专注于给定条件，并通过运营和管理实践忽略了系统的潜力。水文性能的评估是基于持续供水的系统，无水天数为零，雨水利用率为22％。使用敏感性分析确定了在不利条件下改善性能指标的方法，包括增加集水面积和水箱容积以及通过利用雨水溢流来最大化用水。其中，应考虑成本优先考虑增加一个水箱，也可以用一个塑料袋代替。尽管缺乏每日降雨数据和状况的意外变化，但仍可以基于系统监视数据来设计RFD系统。通过对全球RFD系统的持续评估，可以建立适当的区域RFD指南。尽管缺乏每日降雨数据和状况的意外变化，但仍可以基于系统监视数据来设计RFD系统。通过对全球RFD系统的持续评估，可以建立适当的区域RFD指南。尽管缺乏每日降雨数据和状况的意外变化，但仍可以基于系统监视数据来设计RFD系统。通过对全球RFD系统的持续评估，可以建立适当的区域RFD指南。