Water is an essential resource for all living things. How we live on our watershed can impact water quantity and quality. It is important to recognize how humans alter watershed dynamics, but students often find it challenging to visualize watershed processes and understand how decisions that they make as individuals and together as a community can affect water resources. Hydrogeology models can provide students with the opportunity to see firsthand how ground cover affects surface runoff and groundwater recharge, and how pollution travels through creeks, streams, and aquifers. In the lab experiment described here, students interact with hydrogeology models to help them gain a deeper understanding of scientific processes while engaging in the activities of a scientist. (Contains 3 figures.)