Tuesday, 25 March 2014

Risk of erosion

It's a global phenomenon 
  • Damages areas where runoff ends up
  • degrades land that is eroded
  • reduces crop yields
  • eroded soil damages dams, rivers, lakes, buildings and roads
  • Occurs particularly on steeper slopes, on eroidable soils under crops vulnerable to erosion and where unwise farming methods are practised
  • In uplands caused by overgrazing and footpaths
Very High Risk:
Rills likely to form in most years and gullies may develop in very wet periods

High Risk:
Rills are likely to develop in most seasons during wet periods

Moderate:
Sediment may be seen running to roads, ditches or watercourses
Rills may develop in some seasons during very wet periods

Lower:
Sediment is rarely seen to move but polluting runoff may enter ditches or watercourses


Crops' susceptibility to erosion:

High: Winter cereals, potatoes, maize, sugar beet
Moderate: Winter forage crops eg turnips, oil-seed rape
Low: Permanent grass, woodland

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