The graph illustrates Scenario C: Humphrey Dam's water level remains constant initially, rises steadily during prolonged rain, and levels off afterward. Time is on the x-axis, and water height is on the y-axis.
Scenario C is reflected in the graph where the water level behind Humphrey Dam remains constant initially. With the onset of a prolonged rain spell, the water level steadily rises at a consistent rate. After the rain subsides, the upward trajectory ceases, and the water level stabilizes once more.
The x-axis signifies time, and the y-axis represents the height of the water behind the dam. This scenario captures the dynamics of a dam where water levels remain unchanged, experience a steady increase during sustained rainfall, and return to a relatively constant level after the rain ceases, as depicted by the diagonal line on the graph.