本文件提供了开展水损失调查和制定饮用水分配网络水损失管理一般原则的方法，以提高饮用水设施的可持续性，并通过节水、节能和使用化学品保护环境。 本文件建立了一个程序，通过水平衡计算估算水损失成分，并定义水损失管理的一般原则。本文件涉及为减少和管理水损失项目编制水损失管理计划，但不包括其执行。 本文件不包括散装饮用水供应系统，但可能涉及饮用水分配网络内的泵送、储存和传输。 本文件可类似地用于非公共供水系统、原水和工业用水系统。 本文件适用于饮用水公用事业公司和其他利益相关者。

This document provides a methodology for undertaking a water loss investigation and establishing general principles for water loss management in drinking water distribution networks in order to improve the sustainability of drinking water utilities and protect the environment by saving water, energy and use of chemicals. This document establishes a procedure to estimate water loss components through water balance calculations and to define general principles of water loss management. This document deals with the preparation of a water loss management plan for water loss reduction and management projects but does not cover its execution. This document does not cover bulk drinking water supply systems, but can relate to pumping, storage and transmission within the drinking water distribution network. This document can be used analogously for non-public supply systems, raw water and industrial water systems. This document is intended for drinking water utilities and other stakeholders.