1.1 本试验方法涉及在本文规定的条件下，测量水力分离器和地下沉降装置从模拟雨水径流中去除悬浮泥沙的效率。该测试方法旨在应用于实验室环境，为比较系统性能提供共同依据。本试验方法不用于确定现场清除效率。 1.2 该测试方法旨在为任何有兴趣评估HDS性能的利益相关者提供准确、可重复的数据。满足测试要求并不一定意味着任何具有管辖权的机构（AHJ）都会认证结果。在进行测试之前，应咨询AHJ，因为一些AHJ可能需要某些修改、排除某些方法或满足HDS认证的额外标准。本测试方法不认证HDS设备； 监管当局有责任证明该测试方法的结果，并证明给定HDS的性能将满足其特定的性能目标。 1.3 测试的装置应具有通常制造和可供购买的尺寸。为了便于测试，如果操作部件是全尺寸的，具有相同的尺寸、配置和指定用于商业用途的材料，则允许用替代材料代替测试单元的外壳和结构部件。不允许使用缩尺模型。本测试方法并非旨在解决产品缩放问题。 1.4 本试验方法不用于测量过滤器的去除效率或水力分离器和地下沉降装置的冲刷潜力。 1.5 本试验方法仅适用于重力流操作。它不涉及在加压或超载条件下运行的机组的性能。 1.6 除确定和报告泥沙浓度和粒径的方法外，以英寸-磅单位表示的值应被视为标准值。按照惯例，仅以mg/L表示泥沙浓度，以mm或µm表示粒径，这两种单位都是国际单位制。括号中给出的国际单位制是数学转换，仅供参考，不被视为标准单位。以英寸-磅单位以外的单位报告测试结果不应被视为不符合本测试方法。 1.7 本标准并不旨在解决与其使用相关的所有安全问题（如果有的话）。本标准的使用者有责任在使用前建立适当的安全、健康和环境实践，并确定监管限制的适用性。 1.8 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。 =====意义和用途====== 5.1 每个装置都有独特的流型和湍流特性。此外，随着排放、粒径分布、颗粒密度和流动粘度（即水温）的变化，每种装置都表现出广泛的效率。为了正确比较性能，必须将固有因素、流型和湍流与环境因素、颗粒和水特性隔离开来。第节中描述的测试程序 7. 和 8. 提供了一种在给定的流动条件、粒度分布、颗粒密度和流体粘度下测量这些装置去除效率的方法。因此，测试结果仅代表在这一特定条件下的性能。 5.2 由于该测试仅针对单个尺寸单位，因此无法生成足够的数据来预测缩放，除非对多个单位尺寸重复测试或缩放符合规程 C1893 .

1.1 This test method concerns measurement of the efficiency of hydrodynamic separators and underground settling devices in removing suspended sediment from simulated stormwater runoff under conditions defined herein. This test method is intended to be applied in a laboratory setting to provide a common basis for comparing system performance. This test method is not intended for use in determining field removal efficiency. 1.2 This test method is intended to provide accurate, repeatable data for any stakeholder interested in evaluating HDS performance. Meeting the requirements of the test does not necessarily mean any given Authority Having Jurisdiction (AHJ) will certify the results. AHJs should be consulted prior to undertaking testing since some AHJs may require certain modifications, exclusions of certain methods, or additional criteria be met for HDS certification. This test method does not certify HDS devices; it is up to the AHJ to certify results from this test method and to certify that a given HDS’s performance will meet their specific performance goals. 1.3 Units tested shall be of a size commonly manufactured and available for purchase. In order to facilitate testing it is permissible to substitute alternate materials for the housing and structural components of the test units if operational components are at full size, with identical dimensions, configurations and materials specified for commercial use. Scale models are not permissible. This test method is not intended to address product scaling. 1.4 This test method is not for measuring the removal efficiency of filters or the scouring potential of hydrodynamic separators and underground settling devices. 1.5 This test method addresses gravity flow operation only. It does not address performance of units operating under pressurized or surcharge conditions. 1.6 The values stated in inch-pound units are to be regarded as standard, except for methods to establish and report sediment concentration and particle size. It is convention to exclusively describe sediment concentration in mg/L and particle size in mm or µm, both of which are SI units. The SI units given in parentheses are mathematical conversions, which are provided for information purposes only and are not considered standard. Reporting of test results in units other than inch-pound units shall not be regarded as non-conformance with this test method. 1.7 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. 1.8 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 Each device has unique flow patterns and turbulence characteristics. In addition, each device exhibits a wide range of efficiencies as discharge, particle-size distribution, particle density, and flow viscosity (that is, water temperature) change. In order to properly compare performance, the inherent factors, flow patterns and turbulence, must be isolated from the environmental factors, particle and water properties. The testing procedures described in Sections 7 and 8 provide a method of measuring the removal efficiency of these devices under a given flow condition, particle-size distribution, particle density, and fluid viscosity. Therefore, the results of testing represent performance only under this specific set of conditions. 5.2 Since this test is for only a single size unit it does not generate sufficient data for prediction of scaling unless the test is repeated for multiple unit sizes or scaling is in accordance with Practice C1893 .