Hydraulic Power - This is the sheer weight and impact of water against the riverbank. It is greatest under high flow conditions when hundreds of tonnes of water may hit the bank. The force of the water dislodges particles and carries them away., Corrasion - Another name for this is abrasion. The river carries a load of small particles like sand, silt or gravel. These scour the bed and banks, causing undercutting. Large floods will even move boulders causing even greater damage., Corrosion - This is the chemical action on rocks by water and is most effective on limestone rocks, which are carried away by solution. Hard rocks like granite are more resistant., Attrition - Particles carried by the river are reduced in size as they collide with one another. Boulders and pebbles in the upper course are broken down into sand sized particles, which are easier for the river to transport.,

River Erosion

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