Throughflow is a term that is commonly used to describe the process of water moving through soil or rock. However, there are a number of synonyms that can be used to describe this same process. Some alternative terms that can be used include infiltration, percolation, seepage, and drainage. Infiltration and percolation both describe the process of water moving into and through soil or rock. Seepage is a similar process, but typically refers to water moving through very porous materials such as sand or gravel. Drainage on the other hand refers to the movement of water through a system of pipes or other artificial channels designed to manage excess water.