An aquifuge is a geological formation that does not contain or transmit groundwater because it is entirely impermeable. Examples include solid granite or dense, unfractured bedrock.
Other terms:
• Aquifer: Stores and transmits groundwater.
• Aquiclude: Stores water but does not transmit it.
• Aquitard: Allows limited water transmission.
In the context of the effect of drainage density on the run-off generation and the hydrograph at the catchment outlet, all other factors remaining the same, pick one or more CORRECT statement(s):