Depth of Water under Basement Floor 10 8 6 Depth (cm) 4 2 O 2 4 6 8 10 12 14 16 18 20 22 Time (min) Chris has a water pump in his basement. During heavy rain, the pump turned off and on to drain the water collecting under his house's foundation. The graph above models the depth of the water below his basement in terms of time. The depth of water decreased when the pump was on and increased when the pump was off. What is the amplitude