The water table is located between which layers?

The water table is located between which layers?

• A. Porous, unsaturated surface layer and saturated porous rock layer
• B. Bedrock and surface water
• C. Atmosphere and groundwater
• D. Saturated river layer

Answer: (A)

The water table is the boundary between the unsaturated region above and the saturated region below in the subsurface. In many soils, the upper portion is porous and contains both air and water (unsaturated), while beneath it the pore spaces are completely filled with water (saturated). That division exactly corresponds to a porous, unsaturated surface layer over a saturated porous rock layer, so that description fits the water table best. The other options describe interfaces involving surface water, the atmosphere, or non-subsurface concepts, which aren’t where the water table lies inside the ground.

The water table is the boundary between the unsaturated region above and the saturated region below in the subsurface. In many soils, the upper portion is porous and contains both air and water (unsaturated), while beneath it the pore spaces are completely filled with water (saturated). That division exactly corresponds to a porous, unsaturated surface layer over a saturated porous rock layer, so that description fits the water table best. The other options describe interfaces involving surface water, the atmosphere, or non-subsurface concepts, which aren’t where the water table lies inside the ground.