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I agree to a large extent with the statement Urbanisation within a drainage basin can affect flows to and within a river channel.

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Introduction

I agree to a large extent with the statement ?Urbanisation within a drainage basin can affect flows to and within a river channel.? Urbanisation is the physical growth of urban areas as a result of rural migration. Some processes of urbanisation are cutting down of vegetation, removing earth and replacing it with manmade material and drains. Drainage basin refers to the land that drains into a river. Flows to a river channel are flows such as stem flow, infiltration and overland flow. Flows within a river channel are flows such as channel flow. These processes of urbanisation within a drainage basin affect flows to and within a river channel. Urbanisation affects flows to a river channel such as stem flow, infiltration and overland flow. Processes of urbanisation such as cutting down of vegetation and replacing earth with manmade materials will affect these flows. The cutting down of vegetation will reduce interception by vegetation. ...read more.

Middle

As mentioned earlier, urbanisation would lead to a higher and faster discharge after a storm. This would result in a higher volume in the river channel. The amount of channel flow would increase. An increase in the volume of water also leads to an increase in energy. As the river has more energy, it will flow faster and carry more and heavier loads. This results in more erosion. Urbanisation affects the amount and rate of each flow to a large extent as it is the main factor that differentiates each flow. Nature such as rainfall intensity and drainage basin also affects the flow to and within the river channel. Rainfall intensity affects the amount of rain water that is released from the clouds and reaches the surface. High rainfall intensity would result in higher infiltration rate and more overland flow as more water reaches the surface of Earth. This results in a higher amount in flows to the river channel. ...read more.

Conclusion

Though only a small part of the drainage basin may be urbanised, however it may affect the entire drainage basin. In conclusion, Urbanisation brings about big changes to the flows to and within the river channel in terms of time and space. The changes that is brought to the flows to and within the river by urbanisation is long term. Unlike nature, the rainfall intensity only affects the flows to and within in the short term. The rainfall intensity varies from season to season and the changes in the flows to and within the river channel may be just temporary. Urbanisation would also affect a big area of the flows to and within the river channel. Although it may only take place in one area, it may affect the entire drainage basin as the flows lead from one to another. However, the characteristics of the drainage basin only affect a small part of the flow. Therefore, I agree with the statement ?Urbanisation within a drainage basin can affect flows to and within a river channel? to a large extent. ...read more.

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