ABSTRACT
This chapter discusses the basic laws governing the groundwater motion within the aquifers. Darcy published an appendix to a groundwater report about the town of Dijon, which consisted of experimental results with the aim of determining the laws of water flow through sands. Imagination of the actual groundwater flow domain shows irregular void space, fracture, or solution cavity networks that are full of numerous randomly distributed contractions and expansions. The nonlinear flows laws have engaged researchers for many years and they tried to fit empirical curves to the experimental data obtained in the laboratory. The flow in conduits is similar to the pipe flow. Hence, it is possible to say that the karstic media flow laws will be more or less similar to the fractured medium flows. The groundwater flow in an individual fracture is quite different from the porous medium flow but rather similar to the pipe flow.
