True Detective Season 2 Episode 7: Black Maps and Motel Rooms. Written by Nic Pizzolatto (airs Sunday, August 2nd) Ray (Colin Farrell), Ani (Rachel McAdams) and Paul (Taylor Kitsch) take precautionary measures to elude detection and untangle a dark mystery. Frank (Vince Vaughn) deals with the fallout of his betrayal.
Ask me anything! A common example of a permeable rock is a limestone rock. Permeable rocks are defined rocks that have large enough interconnected spaces between particles to allow the movement of gas or liquid through them.
Rock which retains water in this way is called an aquifer. Rock types which can hold water include chalk, limestone and sandstone. Rock types which do not hold water but can prevent water moving out of a permeable rock type include granite, basalt and mudstone. Groundwater supplies springs and wells and, when there has been a period with little rain, it is often groundwater that maintains flow in rivers rather than surface drainage from land.