Classification of Transmissivity Magnitude and Variation

Until now no objective classification of transmissivity has been introduced, in spite of the quantitative nature of transmissivity values and their obvious importance for quantitative appraisals of aquifers or major ground‐water systems. The usual subjective expression of transmissivity, for example as “high” or “low”, prevents the objective comparison of transmissivity values characterizing different areas and hydrogeological environments. A combined classification of magnitude and variation of transmissivity is proposed, with the intention to standardize the expression, comparison, and representation of transmissivity. This classification also enables its compact and unambiguous depiction in tables and maps.