This is the first time students are introduced to the terms groundwater and watershed.  A watershed is a system which contains both surface and groundwater. Water and the chemicals it contains are constantly being exchanged between land and the area beneath the surface. Surface water seeps into the ground and recharges the underlying aquifer—groundwater discharges to the surface and supplies streams with water. There are many ways human activity may impact the watershed. For example, societies may develop regulations which support monitoring and controlling sources of contamination such as industrial waste, agricultural runoff, and sewage. Other examples of activities that may impact the watershed include agricultural practices, wetland restoration, and water sports.