This lesson introduces students to the module challenge—the Rainwater Roundup Challenge. Through a slideshow and water activity, students learn about water as a scarce natural resource. As a foundation for understanding the relationship between standard rainfall measurements and volume, students are challenged to determine the volume of a single playing card. They design rain gauges and place them around the school campus to obtain data for their decisions about where to locate their rainwater collection systems. They also investigate poetry and write their own poems related to module topics. A materials list, safety notes, standards, teacher background information, assessment, and Internet resources are provided. This book selection also includes the Table of Contents, About the Editors and Authors, Acknowledgments, Appendix, and Index.