未核算水（UfW）、非收入水（NRW）或单纯的水损失，差异 在大多数水务设施中，生产水和销售水之间的差异达到了不可接受的水平 全世界。将减少水损失的活动外包通常是唯一可行的解决方案。这个 本文概述了“基于性能的水损失减少”的概念，并提供了 关于世界上最大的NRW减少合同雪兰莪NRW减少的详细信息 项目第一阶段的绩效目标是将NRW减少18540 m3/天。这项工作很成功 按时完成，超额完成目标。基于这一成功，该项目的第二阶段 从2000年4月开始，目标是在整个雪兰莪州减少NRW 在9年内达到200000 m3/d。在项目的前两年之后，所有目标都已基本实现 做得太好了。 项目成本为3.98亿马来西亚林吉特（相当于1.05亿美元），带薪- 6.7的后段 年。基于以下假设，内部收益率计算为33.2%: 水等于平均关税1.27马来西亚令吉（相当于0.33美元）。可以得出这样的结论: 基于绩效的NRW削减合同对于世界各地的水务公司来说是一种可行的模式。 包括3个参考文献、表格和图表。

Unaccounted-for water (UfW), non-revenue water (NRW) or simply water losses, the difference between water produced and water sold, has reached unacceptable levels in the majority of water utilities all around the world. Outsourcing of water loss reduction activities is often the only feasible solution. The paper describes the concept of 'Performance Based Water Loss Reduction' in general and provides detailed information on the world's largest NRW reduction contract, the Selangor NRW Reduction Project. The performance target of Phase 1 was to reduce NRW by 18,540 m3/day. The work was completed on time and the target was over-achieved. Based on this success, Phase 2 of the Project commenced in April 2000 with the goal of reducing NRW across the entire State of Selangor, by 200,000 m3/d over a 9 year period. After the first 2 years of the project, all targets have been substantially overachieved. The project cost is Malaysian Ringgit 398 M (equivalent to US$ 105 M) with a pay-back period of 6.7 years. The Internal Rate of Return was calculated to be 33.2 % based on the assumption that the value of water equals the average tariff of RM 1.27 (equivalent to 0.33 US$). It can be concluded that Performance Based NRW Reduction Contracts are a feasible model for water utilities around the world. Includes 3 references, tables, figures.