ISO 17312:2005规定了使用恒定水头法测定粒状土壤（如砂和砾石）的水力传导率，该方法涉及刚性壁渗透仪，以测量水的层流。该程序确定了颗粒状土壤的水力传导率的代表值，这些土壤可能出现在路堤中的自然沉积物中，或用作路面下的基层时。 为了限制试验期间的固结影响，本程序仅适用于通过75微米筛的土壤含量不超过10%的扰动粒状土壤。 ISO 17312:2005适用于含少量或不含淤泥的砂和砾石压实样品的导水率测量，其中沿渗透计刚性壁流动对试验结果没有实际影响。 ISO 17312:2005不适用于淤泥和粘土，其边界处的渗流/流动是不可接受的。

ISO 17312:2005 specifies the determination of the hydraulic conductivity of granular soils (e.g. sand and gravel) using a constant-head method involving a rigid-wall permeameter to measure the laminar flow of water. The procedure establishes representative values of the hydraulic conductivity of granular soils that can occur in natural deposits as placed in embankments, or when used as base courses under pavements. In order to limit consolidation influences during testing, this procedure is applicable only to disturbed granular soils containing not more than 10 % soil passing a 75-micrometre sieve. ISO 17312:2005 is applicable to the measurement of hydraulic conductivity of compacted samples of sands and gravels containing little or no silt, where flow along the rigid wall of the permeameter has no practical implications on the test results. ISO 17312:2005 is not applicable to silt and clay, where seepage/flow at the boundaries is not acceptable.