Groundwater resources are often the main source of drinking water for remote communities, but they are increasingly found to be unsuitable, and a source of ill health in many parts of the world. High annual rainfall in monsoonal regions makes rainwater harvesting an attractive alternative, but lack of infrastructure for capturing and storing sufficient quantities is often restrictive. This study focuses on the coastal region of Bangladesh where groundwater supplying tubewells are progressively found to contain arsenic and high salinity, and where cyclones are a common cause of damage to infrastructure. The aim of this study is to evaluate the potential of a village scale rainwater harvesting scheme as a solution to water security concerns. Analysis of various size rainwater storage systems (RSS) is conducted using daily rainfall data from Khulna Station in Bangladesh. It was found that a village scale RSS with 3 m deep and 100 m by 100 m surface area could supply 100 L/p/d for 85% of the year. The reliability could feasibly be increased to 100% with seasonal water restrictions. The village scale RSS is compared with an individual household level RSS. Advantages of the village scale RSS include the opportunity for improved management and water quality monitoring, and the potential for public-private partnerships. The proposed methodology can be adapted to other monsoonal delta regions to enhance water supply.

地下水资源通常是偏远社区的主要饮用水来源，但是在世界许多地方，地下水资源越来越不适合，并且是健康欠佳的来源。季风区的高年降雨量使雨水收集成为一种有吸引力的选择，但是缺乏用于捕获和存储足够数量基础设施的局限性。这项研究集中在孟加拉国沿海地区，该地区逐渐发现地下水供应管井中含有砷和高盐度，而旋风是造成基础设施损坏的常见原因。这项研究的目的是评估一个乡村规模的雨水收集计划作为解决水安全问题的潜力。使用孟加拉国Khulna站的每日降雨数据对各种规模的雨水存储系统（RSS）进行分析。结果发现，一个村级RSS的深度为3 m，表面积为100 m x 100 m，可以在一年的85％内提供100 L / p / d。在季节性用水限制下，可将可靠性提高到100％。将村庄规模的RSS与单个家庭级别的RSS进行比较。乡村规模的RSS的优势包括改进管理和水质监测的机会，以及建立公私伙伴关系的潜力。所提出的方法可以适用于其他季风三角洲地区以增加供水。在季节性用水限制下，可将可靠性提高到100％。将村庄规模的RSS与单个家庭级别的RSS进行比较。乡村规模的RSS的优势包括改进管理和水质监测的机会，以及建立公私伙伴关系的潜力。所提出的方法可以适应其他季风三角洲地区，以增加供水。在季节性用水限制下，可将可靠性提高到100％。将村庄规模的RSS与单个家庭级别的RSS进行比较。乡村规模的RSS的优势包括改进管理和水质监测的机会，以及建立公私伙伴关系的潜力。所提出的方法可以适应其他季风三角洲地区，以增加供水。