Sixth-grade students recently finished two units in science class about soils, erosion and deposition. As a culmination of the units, the students were challenged to design and build an earthen dam. Using the knowledge they gained, the students tested different soils for permeability to determine the best types to use in their design. As each team designed their dams, they considered the placement of the soils they chose based on the soil’s properties. Each team tested their dam to determine how well the structure performed. As part of their presentation to the class, the teams also reflected on their design and made suggestions for redesign.