本文件概述了在各种情况下评估土工合成材料可用和所需流速的标准，提供了可用实验室测试的总结，并列出了在设计排水系统使用土工合成材料时可应用于参数的安全系数和折减系数。购买本文件时可获得的所有当前修订均包含在购买本文件中。

This document outlines the criteria for evaluating the available and the required flow rate of geosynthetics in various situations, provides a summary of the available laboratory testing, and lists the safety factors and reduction factors that can be applied to the parameters when designing using geosynthetics for drainage systems.All current amendments available at time of purchase are included with the purchase of this document.