When there is a thick mat of organic matter near the surface of a field a second perched water table will form.

This creates a perched water table above the gravel that helps keep the root zone moist during dry conditions.

There are often perched water tables underlying pocosins.

He notes that if permeability decreases with depth, a perched water table may develop in soils at intense precipitation.

Perched water tables in the basalt aquifers have contributed to increased well irrigation, which accounts for approximately 55% of the irrigable water.

However, if the water table is sloping or there is a perched water table as indicated in the accompanying sketch, then seepage will occur.

Vernal pools form where an impermeable or very slowly permeable layer underlies small and shallow depressions and creates a perched water table.

A perched water table (or perched aquifer) is an aquifer that occurs above the regional water table, in the vadose zone.

The thermal features at Mud Volcano and Sulfur cauldron are primarily mud pots and fumaroles because the area is situated on a perched water system with little water available.

This impermeable layer locally impedes drainage and creates perched water levels and causes the formation of vernal pools within the intermound depressions that are associated with Mima Mounds.

Unless there is a danger of a perched water table developing, a perimeter drain surrounding the table should be sufficient to drain surface water and reduce lateral uptake of water by the table if a plastic lining is not present.