Following Decision 1/CP.21 of the Conference of the Parties, Sri Lanka has identified Nationally Determined Contributions for adaptation to climate change. Restoration and rehabilitation of all abandoned tanks is one such contribution in the irrigation sector. The country has around 13,600 working village tanks of ancient origin. These restored tanks provide irrigation and other water needs at different degrees while a large number of tanks remain abandoned. However, regional storage behaviour of the restored tanks is not adequately understood due to the non-existence of a methodology for storage data collection and assessment. The study presents a statistical approach to assess regional storage behaviour of the tanks with data collected using five storage states method. The storage data of 573 working village tanks in southern Sri Lanka covering three years were analyzed, and revealed a high temporal variation of storage behaviour and low resilience to recover from either dryness or failure for providing irrigation water issues. However, higher time-reliability of water-existence below sluice sill level indicates their potential for providing social and environmental needs. Such assessments facilitate identifying real-time management measures and reviewing policy on restoration of similar reservoirs as an adaptation option for climate change in any region.

根据缔约方大会第1 / CP.21号决定，斯里兰卡确定了适应气候变化的国家自主贡献。所有废弃水箱的恢复和修复就是灌溉部门的一项贡献。该国拥有约13,600个古老的工作村庄坦克。这些经过修复的水箱可提供不同程度的灌溉和其他用水需求，而大量水箱仍处于废弃状态。然而，由于不存在用于存储数据收集和评估的方法，因此尚未充分理解恢复罐的区域存储行为。这项研究提出了一种统计方法，以使用五个存储状态方法收集的数据评估储罐的区域存储行为。分析了斯里兰卡南部573个正在工作的乡村坦克三年的存储数据，发现其存储行为随时间变化很大，而从干旱或因灌溉缺水导致的故障中恢复的弹性较低。但是，水闸门槛以下的水存在的时间可靠性更高，这表明它们具有满足社会和环境需求的潜力。这种评估有助于确定实时管理措施，并审查有关恢复类似水库的政策，以此作为在任何区域应对气候变化的一种选择。水闸门槛以下的水具有较高的时间可靠性，这表明它们具有满足社会和环境需求的潜力。这种评估有助于确定实时管理措施，并审查有关恢复类似水库的政策，以此作为在任何区域应对气候变化的一种选择。水闸门槛以下的水具有较高的时间可靠性，这表明它们具有满足社会和环境需求的潜力。这种评估有助于确定实时管理措施，并审查有关恢复类似水库的政策，以此作为在任何区域应对气候变化的一种选择。