本文件规定了使用边界材料和相关试验条件确定土工布或土工布相关产品平面内恒定水头流量的方法。提出了一系列标准试验条件，包括土壤限制、低水力梯度、就座时间和一系列正常荷载。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 specifies a method for determining the constant-head water flow capacity within the plane of a geotextile or geotextile-related product, using boundary materials and test conditions of interest. A standard series of test conditions are proposed, involving soil confinement, low hydraulic gradients, seating times and an array of normal loads.All current amendments available at time of purchase are included with the purchase of this document.