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Some rocks (such as some fine-grained sedimentary rock, metamorphic rock and igneous rock) and unconsolidated sediment (such as clay deposits) have very low permeability. Due to this very low permeability, much of the water from rainfall is unable to infiltrate the land surface and becomes surface water run-off. These very low permeability rocks and sediments do not have enough inter-granular pore space, voids or fractures to contain groundwater or enable flow. As a result of this GDEs are not located in areas within these very low permeability rocks or sediment.
Last updated: 12 April 2017
This page should be cited as:
Exclusion zones, WetlandInfo 2015, Queensland Government, Queensland, viewed 11 February 2019, .