The Atterberg limits can be used to distinguish between silt and clay, and it can distinguish between different types of silts and clays.

Other activities such as land reclamation and lagoon dredging deplete coastal resources permanently.

In Laos, alluvial gold targets were evaluated and testing of sluice recovery of gold from the Mekong River is about to begin.

31. Increasing concern has been expressed over deforestation and associated environmental problems such as soil erosion, siltation, flooding and droughts, and the depletion and, in some cases, extinction of wildlife.

As the city grew, this aqueduct was no longer able to provide enough water of sufficient quality the springs contained a small amount of silt in the summer, and sometimes even ran dry.

Broad depressions are to be found on the edges of the plateau, which form lakes Tanganyika, Mweru and Bangweulu in the north, the Luangwa River in the east, Kafue Basin and the alluvial plains of the Zambezi River in the south and west.

A wide range of open cast alluvial sites of all sizes, from class C bucket and spade enterprises to extensive, high investment class B operations with the potential for development to class A

7. Garimpos (small scale informal mining sites (alluvial primary colluvial)), which cause substantial environmental damage, occur at about 2,000 different locations in Brazil. Approximately half of them are concentrated in the central Amazon region, mostly along river systems.