Assessment of Transmissivity from Specific Capacity Data of the Fractured Basalt Aquifers in North- Northeastern Part of Jordan PDF

Keywords

aquifers, groundwater wells, Jordan

Abstract

Transmissivity of aquifers is usually calculated by evaluating pumping test data. But due to the difficulty of carrying out such tests in addition to their relatively high costs, it is oftenly estimated from specific capacity data. In this article, an empirical relationship is derived using 116 pairs of transmissivity and specific capacity values which are obtained from pumping test analyses of groundwater wells penetrating a fractured Basalt Aquifer systems in two main groundwater basins in Jordan (Azraq and Zarqa Basins). Linear and logarithmic regression functions have been performed and has been found that the logarithmic relationship predicting transmissivity from specific capacity values data has a better correlation (r= 0.94) than the linear relationship (r=0.85). This relationship can be justified because transmissivity and specific capacity are lognormally distributed. The spatial distribution of transmissivity is affected only by the structural elements dominating the north-eastern part of Jordan as influenced by the rift formation since other hydrogeologic phenomena (such as karstification) similar to fractured carbonate rocks are not usually present in basalt