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What are some reasons why rivers get shallow or deeper over the years?

What are some reasons why rivers get shallow or deeper over the years?
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About 0.0001% of earth's water is contained in rivers.In the steeply sloping sections near their source most rivers flow quickly.This fast moving water washes away any gravel,sand and mud leaving a rocky bottom in the river.Lots of small channels that continuously split and join are present in some rivers.These are called braided rivers.They are usually wide but shallow.They are formed on places where the river band is easily eroded and on fairly steep slopes.

Rivers start as very small streams and they grow bigger gradually as more water is added.They can cut deep gorges and canyons as they flow over soft sedimentary rocks.Rivers can cut through bedrock over time.Deep rivers are called meandering rivers.The velocity of the river increases as the river flows downstream.Along the course of the river more water gets added from tributaries and its speed increases.For the water in the river to flow more freely,the larger mass of water causes wider and deeper water channels.  

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