If you built the model water filter in Experiment 7 and still have the empty container, stand, and bowl, you can use them to check the water-holding capacity of a few soils.

Make sure the perforated cap is not clogged. Fill the container about 2/3 full with dry topsoil, and pour in 1 pint of water. As soon as you do, note the time. See how long it takes before the water starts dripping in the bowl, how long the water continues to drip, and how much water comes through. Do the same for sandy soil, clay soil, and subsoil.