Do all types of soil hold the same amount of water? How much more water can one soil hold than another? Students perform three easy-to-follow lab activities to determine how pore size, soil texture, compaction, and surface runoff affect the answers to these questions. • Measure the drainage rate of dry versus wet soil. • Determine the rate of water flow. • Calculate permeability and porosity of different soil types. Includes valuable Teacher Notes, detailed student background information, and reproducible data sheets. Complete for 30 students working in pairs.