Science and Education Publishing American Journal of Applied Mathematics and Statistics 2333-4576 2 3 2014 05 09 Darcy's Law Equation with Application to Underground Seepage in Earth Dams in Calculation of the Amount of Seepage 143 149 EN Koros Kiplangat Vincent Mutua Nicholas Muthama Mathematics and Informatics Department, Taita Taveta University College, Voi, Kenya Sakayo Nicodemus Muoki AJAMS2014238 10.12691/ajams-2-3-8 2013 10 31 2014 01 18 2014 05 09 Water is a very important natural resource that no creation can exist without it. Hence it has become a responsibility of every person to try and conserve this very precious resource. One of the ways of conservation is by building earth dams. However if they are not well managed these dams may end up drying up due to underground seepage leading to failure of the dam. In this paper we are concerned with how to calculate the discharge rate through a porous medium, the velocity of the discharge and finally the total discharge using Darcy's law. This study will also describe a computer based model that accepts input and calculate the amount of discharge per given time. From Darcy's law it is shown that, the discharge rate depends among other factors the porosity of the medium. So from the study we were able to determine which medium is able to hold water rather than supporting percolation.