1.1 本试验方法涵盖了植物（绿色）屋顶系统中使用的合成排水层的水和介质保持力的测定。 1.2 本试验方法适用于将水和介质保留在其上表面杯状容器中的土工合成排水层。示例包括成型塑料膜和闭孔塑料泡沫板。 1.3 本试验方法不适用于由吸水材料制成的产品。 1.4 以国际单位制或英寸-磅单位表示的数值应单独视为标准值。每个系统中规定的值可能不是精确的等效值；因此，每个系统应相互独立使用。将两个系统的值合并可能会导致不符合标准。 1.5 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制定适当的安全、健康和环境实践，并在使用前确定监管限制的适用性。 1.6 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 确定植物（绿色）屋顶系统的这些性能特征可提供信息，以便于评估设施的相关工程方面。 这些方面可能包括结构设计要求、机械工程和热设计要求以及消防和生命安全要求。 5.1.1 关于土工复合排水层的持水能力和介质承载力的准确信息对于预测植被（绿色）屋顶系统的恒载至关重要。 5.2 确定植被（绿色）屋顶系统的这些性能特征提供了信息，以便于评估一个植被（绿色）屋顶系统相对于另一个系统的性能。 5.2.1 在评估植被（绿色）屋顶设计的灌溉要求时，水分捕捉也很有用。 5.2.2 需要有关单位介质保留量的信息来预测建造具有指定总厚度的植被（绿色）屋顶所需的材料量。

1.1 This test method covers the determination of the water and media retention of synthetic drains layers used in vegetative (green) roof systems. 1.2 This test method is applicable to geocomposite drain layers that retain water and media in cup-like receptacles on their upper surface. Examples include shaped plastic membranes and closed-cell plastic foam boards. 1.3 This test method does not apply to products manufactured from water-absorptive materials. 1.4 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard. 1.5 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 to determine the applicability of regulatory limitations prior to use. 1.6 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 Determining these performance characteristics of vegetative (green) roof systems provides information to facilitate the assessment of related engineering aspects of the facility. Such aspects may include structural design requirements, mechanical engineering and thermal design requirements, and fire and life safety requirements. 5.1.1 Accurate information about the water and media holding capacity of geocomposite drain layers is essential to predict dead load for vegetative (green) roof systems. 5.2 Determining these performance characteristics of vegetative (green) roof systems provides information to facilitate assessment of the performance of one vegetative (green) roof system relative to one another. 5.2.1 Water capture is also useful in assessing irrigation requirements for vegetative (green) roof designs. 5.2.2 Information about the unit media retention volume is required to predict the quantity of material that will be required to construct a vegetative (green) roof with a specified total thickness.