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[[Image:Africa Hgcl Envs.png|frameless| right|300px| ]]
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'''Hydrogeological environments in Africa'''<br>
'''London Region Atlas of Topsoil Geochemistry'''<br>


How and where groundwater occurs depends primarily on geology; geomorphology/weathering; and rainfall (both current and historic). The interaction between these three factors gives rise to complex hydrogeological environments with countless variations in the quantity, quality, ease of access to and renewability of groundwater resources. Developing groundwater resources therefore depends on a good understanding of hydrogeology. Africa has huge diversity in geology, climate and hydrology, and as a result, the hydrogeology of Africa is hugely variable.  [[Overview_of_Groundwater_in_Africa | '''(Read the full article...)''']]
The simplified geological map used in this atlas, and in particular for creating the soil parent material (PM) classes, is based on the classification used for radon mapping in England and Wales (Miles and Appleton, 2005). The area is underlain by Cretaceous and Palaeogene bedrock, which is covered in some areas by Quaternary superficial deposits. Artificial ground is not used as a soil PM class, because spatial information on the distribution of artificial ground in urban areas in the UK is incomplete. Parent material classes are summarised in Table 2 with an indication of the number of topsoil results associated with each class. .  [[London Atlas: Geology | '''(Read the full article...)''']]

Revision as of 11:38, 30 March 2017

P929859.jpg

London Region Atlas of Topsoil Geochemistry

The simplified geological map used in this atlas, and in particular for creating the soil parent material (PM) classes, is based on the classification used for radon mapping in England and Wales (Miles and Appleton, 2005). The area is underlain by Cretaceous and Palaeogene bedrock, which is covered in some areas by Quaternary superficial deposits. Artificial ground is not used as a soil PM class, because spatial information on the distribution of artificial ground in urban areas in the UK is incomplete. Parent material classes are summarised in Table 2 with an indication of the number of topsoil results associated with each class. . (Read the full article...)