Just as the porosity of a soil affects how much water it can hold, it also affects how quickly water can flow through the soil.

The ability of water to flow through a soil is referred to as the soil's permeability. As you can probably guess, the permeability of gravel is higher than that of clay. But can you guess how much higher? Click the button below to see how long it might take water to travel 1 meter in different soil types....