1.1 本指南涵盖了在地表水体调查期间确定水平位置测量常用程序的选择，如下所示: 小节 程序A-手动测量 7至12 程序B-光学测量 13至17 程序C-电子测量 18至27 1.1.1 叙述中规定了水平定位术语，并描述了手动、光学和电子测量设备和技术。 1.2 引用的参考文献包含可能有助于设计高质量测量程序的信息。 1.3 水平定位提供的信息本质上是描述性的，不打算认可任何特定的制造设备或程序。 1.4 本指南适用于确定静态或低速流中深度测量的水平位置。 1.5 以英寸-磅为单位的数值应视为标准值。 括号中给出的值是到国际单位制的数学转换，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====== 5.1 本指南旨在提供在地表水体水深测量中遇到的各种条件下选择水平定位设备的说明。 这些条件包括测量现场的物理条件、所需数据的质量、适当测量设备的可用性以及进行测量的距离（包括成本考虑），这些条件控制着选择过程。没有讨论获得水平位置的逐步过程。本指南将与《地表水深度测量标准指南》（如标准实践）结合使用 D5173 .)

1.1 This guide covers the selection of procedures commonly used to establish a measurement of horizontal position during investigations of surface water bodies that are as follows: Sections Procedure A—Manual Measurement 7 to 12 Procedure B—Optical Measurement 13 to 17 Procedure C—Electronic Measurement 18 to 27 1.1.1 The narrative specifies horizontal positioning terminology and describes manual, optical, and electronic measuring equipment and techniques. 1.2 The references cited contain information that may help in the design of a high quality measurement program. 1.3 The information provided on horizontal positioning is descriptive in nature and not intended to endorse any particular item of manufactured equipment or procedure. 1.4 This guide pertains to determining horizontal position of a depth measurement in quiescent or low velocity flow. 1.5 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI 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 ====== 5.1 This guide is intended to provide instructions for the selection of horizontal positioning equipment under a wide range of conditions encountered in measurement of water depth in surface water bodies. These conditions, that include physical conditions at the measuring site, the quality of data required, the availability of appropriate measuring equipment, and the distances over which the measurements are to be made (including cost considerations), that govern the selection process. A step-by-step procedure for obtaining horizontal position is not discussed. This guide is to be used in conjunction with standard guide on measurement of surface water depth (such as standard Practice D5173 .)