Integrating with the national project of irrigation canals lining in the Egyptian countryside, the present study is introduced. The study presents a technical comparative reading in different theories and equations usually used for estimating the quantities of water that seep from the earthen irrigation canals. The quantities of the irrigation water lost due to seepage are great enough to decrease the wide gap between the needed and available quantities of water that Egypt seriously suffers from. The accurate estimation of water quantities that may seep, or leak enables the decision maker to choose the perfect method for making use of such quantities and where it may be used. From Assiut countryside the El-Sont branch canal and its off-takings was chosen to be our case study. After a careful engineering, technical reading in seepage equations that researchers introduced previously, the closest relationships to our case study were used. Results indicated that, using the suggested relationship by nazir Ahmed [1], and the Indian equation [2] gave the maximum seepage quantities for the entire El-Sont canal network. This seeped water represents about 21.5% of the total canal head discharge. Most of this lost water can be saved due to the implementation of the national project of irrigation canals lining.