M22的第三版包含估计客户需求和最大预期流量所需的信息，可用于确定新服务线路和仪表的尺寸。本版扩展了供水管线和水表的尺寸确定方法，并提供了专用灌溉水表尺寸确定的改进方法。M22包括一种称为需求分析的实用现场方法，可用于评估实际客户使用模式，并帮助优化仪表尺寸选择。M22中提供的数据来自现场测量、公用设施调查、技术出版物和水力设计计算。本手册强调，如果公用事业公司掌握了有关特定尺寸情况的更多信息，那么从水龙头到仪表的尺寸决策将是最佳的。 这些信息已压缩成简化格式，以帮助读者解决最常见的使用条件。本手册中包含的方法适用于参与设计和建造需要供水服务的项目的水务设施经理、工程师、规划师、技术人员、现场操作人员和顾问。

This third edition of M22 contains information needed to estimate customer demand and maximum expected flow that can be used to size new service lines and meters. This edition expands the ways to approach the sizing of water service lines and meters and offers improved methods for the sizing of dedicated irrigation meters. M22 includes a useful field method called demand profiling that can be used to evaluate actual customer use patterns and help optimize meter size selection.The data presented in M22 were obtained from field measurements, utility surveys, technical publications, and hydraulic design calculations. This manual emphasizes that utilities having more information about a specific sizing situation will result in the best sizing decision from the tap to the meter. This information has been condensed into a simplified format to assist readers in addressing most common service conditions. The methods contained in this manual are appropriate for water utility managers, engineers, planners, technicians, field operations personnel, and consultants involved with designing and constructing projects requiring water service.