This document discusses water erosion, which is the removal of soil by water. It defines erosion as the detachment, transportation, and deposition of soil. The main causes of erosion are misuse of land, deforestation, and poor soil management. The agents of erosion are wind, water, temperature, and biological factors. Water erosion specifically refers to the removal of soil particles by rain or flowing water. The forms of water erosion are rain splash, sheet, rill, gully, and stream erosion. Climate, soil properties, and topography affect the rate of water erosion.
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Water erosion
1. WATER EROSION
Muhammad Nadeem Ashraf
Student, Soil & Environmental Science
Faculty of Agriculture, Rawalakot
2. EROSION
“Removal of soil from its original position”
Or
“It is the process of detachment,
transportation & deposition of soil
materials from one place to another by
erusive agents”
8. Water Erosion
“ It is the detachment, transportation & deposition
of soil particles by the force of water from one
place to another.”
Soil erosion by water is the result of rain
detaching & transporting of vulnerable soil,either
directly by means of rain splash or indirectly by
rill & gully erosion.
9. Forms of water erosion
A). Rain Splash Erosion:
Rain splash erosion is caused by the impact of
water striking the surface of soil.
It takes place in two steps.
1. As precipitation fills the pore spaces, loosening
& driving soil particles apart.
2. Impact of subsequent rain drops hitting the
surface, transporting particles to other area.
12. B) Sheet Erosion.
“ It is the uniform removal of soil in thin
layers in sloping land resulting from rain
splash erosion.”
surface runoff forms when the rainfall
intensity of a storm exceeds the infiltration
capacity of soil.
14. C) Rill Erosion.
It is caused by water concentrating into
innumerable, closely spaced small
channels. Left unchecked, rills can cut
vertically & horizontally and when joined
form gullies.
17. D) Gully Erosion.
Gullies are steep-sided trenches formed by
the coalescence of many rills.Once they are
started difficult to stop.
Stages of gully erosion.
Stage-1. Cutting top soil.
Stage-2. Enlargement of gullies.
Stage-3. Healing stage.
Stage-4. Stablization.
22. Factors affecting water Erosion
A) Climate.
1. Precipitation.
2. Temperature.
3. Wind.
4. Humidity.
5. Solar radiation.
23. B) Soil.
1. Physical properties of soil.
2. Vegetation cover.
3. Organic matter contents in soil.
4. Moisture contents of soil.
5. Soil density
C) Topography.