This lesson is designed to give students an enhanced understanding of the water cycle and rain as a resource, increase their measurement and data collection skills, and develop graphing and data interpretation skills. It expects that students will demonstrate the ability to measure and record rates of rainfall, evaporation, and infiltration and to graph and interpret data. The lesson provides detailed instructions as well as background information, lists of material, charts, graphs, internet access, ideas for assessment and enrichment and a list of references.