1.1 本试验方法包括用薄板堰测量渠道中水和废水的体积流量。与本试验方法相关的信息可在Rantz中找到 ( 1. ) 2. 和阿克斯 ( 2. ) . 1.2 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。 1.3 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。 1.4 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 薄板堰是可靠和简单的设备，具有高精度流量测量的潜力。通过适当选择溢流段的形状，可以覆盖大范围的排水；本试验方法中的建议基于流速约为0的实验。 008英尺 3. /s（0.00023米 3. /s） 约50英尺 3. /s（1.4米 3. /s） 。 5.2 薄板堰特别适用于无大量固体的水和废水中，以及水头损失可承受的位置。

1.1 This test method covers measurement of the volumetric flow rate of water and wastewater in channels with thin-plate weirs. Information related to this test method can be found in Rantz ( 1 ) 2 and Ackers ( 2 ) . 1.2 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. 1.3 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. 1.4 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 Thin-plate weirs are reliable and simple devices that have the potential for highly accurate flow measurements. With proper selection of the shape of the overflow section a wide range of discharges can be covered; the recommendations in this test method are based on experiments with flow rates from about 0.008 ft 3 /s (0.00023 m 3 /s) to about 50 ft 3 /s (1.4 m 3 /s). 5.2 Thin-plate weirs are particularly suitable for use in water and wastewater without significant amounts of solids and in locations where a head loss is affordable.