The system shows two aquifers with one aquitard -LRB- a confining or impermeable layer -RRB- , between them , surrounded by the bedrock aquiclude , which is in contact with a gaining stream -LRB- typical in humid regions -RRB- .

The diagram shows typical flow directions in a cross-sectional view of a simple confined/unconfined aquifer system -LRB- two aquifers with one impermeable layer , between them .
