av Lee Seng Ngee för 13 årar sedan
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If the gradient is steep, the river will flow Quickly.
If the gradient is gentle, the river will flow slowly
This will slow down the river flow ans reduce the speed of the river.
Friction causes the flow of river to slow down.
IF the wetted perimeter is large, there will be more water.
If wetted perimeter is small, less friction is generated.
Amount of water in channel fluctures acording to the amount of rainfall recieved during each lesson.