A demonstration of the features formed by water drainage in limestone areas, both at the surface and underground. Permeable and impermeable layers of rock in the Malham area give rise to ...

An example of a swallow hole in the Yorkshire Dales is Gaping Gill. When a stream disappears through the permeable limestone, it travels underground through a complex series of caves. It ...

The reports detail plans on how best to preserve the Point's limestone block ... that your edge along the lakefront is not so permeable to wave tide," said Debra Hammond, Promontory Point ...