Formation of Delta• At the river mouth, a river loses energy and starts to deposit its sediments.

Formation of Delta• As the

sediments build up, the mouth will be blocked

• The river also split into several small channels called distributaries to flow to the sea.

DistributariesDelta

Over time, the accumulated sediments that rise over the water and the distributaries form a delta.

Meander

• A river that follows a winding course, usually forming hoop-like bends.

• River may meander becauseLower gradient � lower speed � lower river energy river turns to avoid obstacles

Meander

Note: Outer Bank = Concave Bank

Note: Inner Bank = Concave Bank

River Cliff

• Constant erosion (undercutting) erodes the outer (concave) bank of the meander

• forming a river cliff.

Slip-off slope

River cliff

Slip-off slope

• Constant deposition at the outer (convex) bank deposits sediments

• forming a slip-off slope.

Slip-off slope

River cliff

Positive Impact of river

• Rivers provide water for domestic purposes such as drinking, bathing and washing.

• Rivers are a good source of food such as fish and prawns.

Positive Impact of river

• Rivers are important waterways for transporting people and goods.

Negative Impact of river

•River water overflows river bank cause lives to be lost and destroy property and crops.

Negative Impact of river

• Consuming contaminated river water can cause people to fall ill

• Eg contract diseases such as cholera.