Six student activity books to be used along with the STEM in Action: Rainwater Runoff Design Challenge Classroom Module. In this module students explore types of water pollution and subsoil in a garden. By using critical thinking, communication, and collaboration to design and build a model of subsoil for a rain garden, students prepare for essential skills of the 21st century. Students work through the Engineering Design Process – to learn the value of rethinking and supporting multiple solutions.