Which definition accurately describes the "Water Table"?

The definition of the "Water Table" as the level below which the ground is saturated with water is accurate because it describes the boundary between the unsaturated zone above and the saturated zone below in the soil. When considering groundwater, the water table represents the depth at which soil pores are completely filled with water. Understanding the water table is crucial for various applications, including environmental science, agriculture, and septic system design, as it influences the availability of groundwater and can affect the performance of septic systems.

Other choices do not align with the concept of the water table. A permanent body of water within a river refers to surface water features and does not encompass the concept of saturation within soil. The lowest point of a water reservoir pertains specifically to water storage structures and does not involve subsurface conditions. The depth at which soil contains sand and clay describes soil composition rather than the saturation level of groundwater.