1.1 本规程提供了一种评估雨水质量的方法。 1.1.1 该实践确定了一套研究和报告要求，允许预期用户评估特定场地集水区的雨水质量。 1.1.2 本规程描述了雨水质量的一般特征，并确定了可能影响雨水质量的现场条件。如果存在影响雨水的现场条件，则可能需要额外的评估技术。 1.1.3 指导该实践发展的目标是( 1. )综合并书面提出雨水质量评估的良好商业惯例和惯例； ( 2. )促进高质量、标准化的水管理协议；和( 3. )阐明切实合理的尽职调查标准。 1.2 本规程未制定雨水收集系统的设计要求。然而，它可以提供与雨水收集项目的设计和实施相关的决策支持信息。 1.3 本规程不确定雨水的商业或其他用途。然而，它可以提供信息支持与房地产条件和开发方案评估相关的决策。 1.4 本实践提供了一组用于执行一个或多个特定操作的说明。 本文件不能取代教育或经验，应与专业判断一起使用。 1.4.1 水资源法因管辖辖区而异。本规程的用户有责任确定适用于雨水质量评估和潜在用途的法规要求。 1.5 以国际单位制表示的数值应视为标准值。括号中给出的值是英寸-磅单位的数学转换，仅供参考，不被视为标准值。 1.6 本标准并非旨在解决与其使用相关的所有安全问题（如有）。 本标准的用户有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.7 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 ====意义和用途====== 4.1 随着世界人口的增加，对水的需求也在增加，以满足各种需求。 雨水收集为满足各种用水需求提供了一种可行、可持续的方法。 4.1.1 雨水收集可能是许多没有其他供水的农村和偏远家庭的唯一供水来源。在城市和郊区，雨水收集可能有助于公共供水系统减少峰值需求，并有助于推迟扩建水处理厂的需要。 4.1.2 雨水收集可以减少城市环境中的雨水径流、非点源污染和侵蚀。 4.1.3 雨水收集提供了冗余和多样化系统，减少了与集中设施相关的安全问题。 4.2 为了确定雨水收集系统中收集和储存的水的适当用途，有必要对雨水质量进行评估。该实践确定了一套研究和报告要求，允许预期用户评估特定场地的雨水质量。

1.1 This practice provides a methodology for assessing rainwater quality. 1.1.1 This practice identifies a set of research and reporting requirements that will permit the intended user to assess the rainwater quality of a catchment area of a particular site. 1.1.2 This practice characterizes rainwater quality in general and identifies site conditions that may affect rainwater quality. Where site conditions affecting rainwater exist, additional assessment techniques may be required. 1.1.3 Objectives guiding the development of this practice are ( 1 ) to synthesize and put in writing good commercial and customary practice for rainwater quality assessment; ( 2 ) to facilitate high quality, standardized water stewardship protocols; and ( 3 ) to clarify a standard of due diligence that is practical and reasonable. 1.2 This practice does not establish design requirements for rainwater harvesting systems. However, it may provide information in support of decisions relative to design and implementation of rainwater harvesting projects. 1.3 This practice does not identify use(s) of rainwater, commercial or otherwise. However, it may provide information in support of decisions relative to evaluation of property conditions and development options. 1.4 This practice offers a set of instructions for performing one or more specific operations. This document cannot replace education or experience and should be used in conjunction with professional judgment. 1.4.1 Water laws vary among governing jurisdictions. It is the responsibility of the user of this practice to determine regulatory requirements applicable to rainwater quality assessment and potential use(s). 1.5 The values stated in SI units are to be regarded as standard. The values given in parentheses are mathematical conversions to inch-pound units that are provided for information only and are not considered standard. 1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.7 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 4.1 As the world's population increases, so does the need for water to meet various needs. Rainwater harvesting offers a viable, sustainable approach to satisfying various water needs. 4.1.1 Rainwater harvesting may be the only source of water supply for many rural and remote households where no other water supply is available. In urban and suburban locations, rainwater harvesting may help public water systems reduce peak demands and help delay the need for expanding water treatment plants. 4.1.2 Rainwater harvesting can reduce storm water runoff, nonpoint source pollution, and erosion in urban environments. 4.1.3 Rainwater harvesting provides for redundancies and diversified systems that decrease security issues associated with centralized facilities. 4.2 An assessment of rainwater quality is necessary for determination of appropriate uses for water collected and stored in rainwater harvesting systems. This practice identifies a set of research and reporting requirements that will permit the intended user to assess the rainwater quality of a particular site.