Hydrogeology seeks to understand and quantify the factors controlling the flow of water through soils and rocks. It is supported by physical laws describing the flow of fluids and the chemical evolution that occurs during such flow. It also focuses on human interaction with the groundwater regime; such as exploitation capacity for industrial use, agricultural irrigation and as drinking water. Consequently, important subjects of research include the interaction and connection with surface waters, groundwater contamination and hydraulic connectivity among aquifers. Hydrogeological studies can be carried out through a wide variety of methods such as, numerical modeling, geostatistical approaches, geophysical investigation, remote sensing and machine learning techniques.