Relationship between the transmissivity and the specific capacity data of the Moghra Aquifer System, Western Desert, Egypt

Usually, transmissivity of aquifers is calculated by evaluating aquifer tes t data. However, due to the difficulty of carrying out such tests in additi on to their relatively high costs, it is often calculated from specific cap acity data. In this work, an empirical relationship is derived using 101 pa irs of transmissivity and specific capacity values which are obtained from pumping test analyses of groundwater wells penetrating the Moghra Aquifer S ystem in the northern part of Western Desert, Egypt. Linear and logarithmic regression functions have been performed, and it has been found that the l ogarithmic relationship, predicting transmissivity from the specific capaci ty values, has a greater correlation coefficient (r = 0.93) than the linear relationship (r = 0.82). This relationship can be justified because transm issivity and specific capacity are log-normally distributed.