Try this activity; your students will love it! This is the perfect hands-on activity that could be used to introduce a unit on volume or provide an entertaining and educational capstone activity. Your students will participate in a hands-on activity in which they will practice using customary units of measure for capacity (volume), including gallons, quarts, cups, liters and more. Your students will also learn about the dams on the Missouri River, including the Oahe Dam which has the 4th largest reservoir in the United States. Related CFS video.