Dead leaves, ping-pong balls or plastic golf balls are floated down a small stream. The number of leaves/balls passing recording stations along the stream are tallied. Students are then challenged to develop a transport model for the resulting data. From this exercise students gain greater understanding of PDE modeling, conservation laws, parameter estimation as well as mass and momentum transport processes.
Kummel, Miro; Bruder, Andrea; Powell, Jim; Kohler, Brynja; and Lewis, Matt, "Stream Lab" (2016). Laboratory Experiences in Mathematical Biology. 4.