Fracture abundance refers to the quantity of fracturing in a rock mass, and as such is important in all areas of rock engineering and fractured rock hydrology. The abundance measures we discuss are density, intensity and porosity. These measures comprise a unified, self-consistent system that allows for conversion between measures and from one dimension to another (e.g., 1-d to 3-d). This paper extends the Fracture Abundance Matrix of Dershowitz (1985). The new system is consistent with the original system of abundance measures, but extends the treatment of porosity, and adds a more general family of conversion coefficients for conversion between different dimensions and types of abundance measures.

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