Field measurements of hydraulic properties of the rock matrix and in low permeability hard rocks generally require highly accurate and sensitive technical equipment and special methods of measurement. Hydraulic conductivity of intact rocks is mostly measured in the laboratory conditions; field measurements are less common. The Czech geological survey developed equipment, which allows measurements of very low consumption of water during WPT (water pressure tests). This device enables to implement the same testing methodology for all sections of the borehole and subsequently compare the obtained results from low-permeability as well as more permeable sections.

Hydraulic conductivity of eight different granitoids was studied in the Bohemian Massif in the Czech Republic. Mean values of hydraulic conductivity of fractured rock are on the order of 10^-8 to 10^-7 m·s^-1, while hydraulic conductivity of rock matrix was most frequently on the order of 10^–11 to10^-12 m·s^-1. The difference of values measured in laboratory and field is caused by scale effect. The significance of scale effect in rock matrix is determined mainly by the connectivity of a network of microfissures. Length and aperture of microfissures govern mainly the connectivity of fissure net in rock matrix. Coarse-grained granitoids have greater length and aperture of microfissures, higher connectivity and hydraulic conductivity, and the scale effect is less significant. The fracture network appearance and hydraulic conductivity of rock matrix is similar and characteristic for different types of granitoid rocks.

岩石基质和低渗透性硬岩的水力特性的现场测量通常需要高度准确和灵敏的技术设备和特殊的测量方法。完整岩石的导水率主要在实验室条件下测量；现场测量不太常见。捷克地质调查局开发了设备，可以在 WPT（水压测试）期间测量极低的水消耗。该设备能够对钻孔的所有部分实施相同的测试方法，并随后比较从低渗透率和高渗透率部分获得的结果。

在捷克共和国的波西米亚地块中研究了八种不同花岗岩的导水率。裂隙岩石的水力传导率平均值在10 ^-8到10 ^-7 m·s ^{-1 的数量级}，而岩石基质的水力传导率最常在10 ^{–11 到}10 ^-12 m·s ^{-1 的数量级}. 实验室和现场测量值的差异是由尺度效应引起的。岩石基质中尺度效应的显着性主要取决于微裂缝网络的连通性。微裂隙的长度和孔径主要控制岩石基质中裂隙网的连通性。粗粒花岗岩具有较大的微裂隙长度和孔径、较高的连通性和导水率，尺度效应较不显着。不同类型花岗岩的裂缝网络形态和岩石基质的水力传导率具有相似性和特征性。