What is water erosion ?
Water erosion is the removal of the top layer of land by water from irrigation, rainfall, snowmelt, runoff, and poor irrigation management. Ultimately, rainwater is most frequently to blame when it comes to this issue. The flowing water moves the soil organic and inorganic particles alongside the land surface, depositing them in the lower landscape. The result of this would be flooding in the long run. The eroded soil material can either form a new soil or move to water reservoirs nearby.
 
Different types of water erosion
splash erosion
This is the first stage in the erosion process that is caused by rain. Raindrops basically “bombard” the exposed and bare land, moving its particles and destroying the structure of the top layer.

sheet erosion 
This type of soil degradation by water occurs when the rainfall intensity is greater than the soil infiltration ability and results in the loss of the finest soil particles that contain nutrients and organic matter.
rill erosion 
Rill erosion follows after, when the water concentrates deeper in the soil and starts forming faster-flowing channels. These channels can be up to 30cm deep and cause detachment and transportation of soil particles.
gully erosion 
This is an advanced stage of land damage by water when the surface channels are eroded to the extent when even tillage operations wouldn’t be of any help. 
tunnel erosion
This is the so-called “hidden” type of land degradation by water that can cause severe disruption even before any signs are evident to the eye. It begins when large water mass starts moving through the structurally unstable soil.
What Are The Negative Effects Of Water Erosion?
 
Flooding 
Severe land degradation by water can negatively impact the ecosystems  by causing flooding. The washed away topsoil loses its water absorption ability, greatly increasing the possibility of flooding in areas that are predisposed to it. It could be low-lying landscapes and soils with limited drainage ability. Ultimately, heavy flooding can be extremely disruptive to the extent of ruining roads and buildings. That is why it’s critical to spot negative changes in farmland health to prevent the situation from getting to that point.
Impact of water quality
Apart from affecting animals, plants, and farmland, water erosion also significantly decreases the quality of water itself. The particles of the eroded soil eventually reach the water sources nearby, changing the water chemical content and reducing its oxygen levels. Besides, the water from eroded farmlands contains harmful chemicals (due to previous pesticides application), washing them off to lakes, streams, and rivers.
How to stop water erosion and its management 
Water erosion control is vital in battling the issue of land degradation caused by water. And the
water erosion solutions differ depending on the , topography, climate, crop rotation, and land use. However, there are water erosion prevention measures for its every type.
QUIZ 
Which of these different types of water erosion does not exist?
a) splash erosion 
b) sheet erosion 
c) rill erosion 
d) gully erosion 
e) tunnel erosion 
f)drill erosion 
 
Source
eos.com 
written by Leandro and David