The effects of layering on an aquifer were studied to obtain a better definition of the properties of the Ogallala Formation in the panhandle of Oklahoma. Two sand models simulated the conditions found in this area. Laboratory analyses of sand samples from the area were used to give an initial definition of the materials used in the model study. The validity of using a layered approach as opposed to a homogeneous approach in a computer modeling of the aquifer is supported by some of the data obtained. Transmissibilities of layers in combinations are approximated by a summation of the layer transmissibilities.