Human Impact on Rivers

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Since their existence, man has depended on rivers for their survival.
Man has harnessed the river on his journey to industrialisation and
development. Throughout the process, man has impacted both
positively and negatively on rivers. In this presentation, we will examine
some of man’s impact on rivers.
As a result of this lesson, the student will be able to:
•identify at least 5 ways in which man has impacted rivers.
•describe the impact of each on man and the river basin.
•discuss the measures which individuals, governments and non-
governmental organisations have implemented to reduce the negative
impacts of human activity.
•make a commitment to preserving and conserving the environment.
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 There are twelve questions in this instructional material.
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 Read the question above and then type your response in the box below.
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FEEDBACKFEEDBACK
 It can be used to supply water for domestic and other
purposes.
 It can be used to generate electricity
 It can be used for cooling down processes in industries
 The volume of water in the lower section is reduced
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FEEDBACK
All the water stored in the dam
will flow downstream very
rapidly causing flooding to
areas below the dam.
 Read the question above and then type your response in the box below.
 You must be in Slide Show View to type and delete text.
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Rapid overland flow increases,
so water reaches to the river
much faster than normal
leading to flooding and
erosion.
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 Read the question above and then type your response in the box below.
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• Chemicals from industries are directly dumped in rivers or indirectly may
contaminate the air and reach back to the ground and rivers as acid rain.
• Some chemicals seep into the ground water supply and eventually
enters the river via through-flow.
• Sewage disposal into gullies and rivers increases algae growth.
• Household garbage is unsightly and also adds pollutants to the river.
CHECKCHECK

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 Read the question above and then type your response in the box below.
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• Deforestation takes place to access the mining area, this in
itself leads to flooding
• When the bauxite is mined out, there is a lowering of the
water table which reduces the water available to plants. It also
increases run off during periods of heavy rainfall, which can
also lead to flooding.
CHECKCHECK

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 Read the question above and then type your response in the box below.
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FEEDBACK
• The river channel is lowered, raising the river banks which may
collapse.
• It changes the natural processes occurring in the river channel, as the
river may continue to erode in its lower course and wash away bars
and other features found at or near the river mouth.
• Foundation of bridges may become exposed and the bridge may
eventually collapse.
CHECKCHECK

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 Read the question above and then type your response in the box below.
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• Rate of flow increases rapidly
• The volume of water also increases rapidly
• Both increases the likelyhood of flooding
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 Read the question above and then type your response in the box below.
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It takes a shorter period of time after urbanisation
for volume and rate of flow to increaseCHECKCHECK

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 Read the question above and then type your response in the box below.
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FEEDBACK
Flash flooding
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 Read the question above and then type your response in the box below.
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FEEDBACK
• Use less concrete pavements at home.
• Plant more trees and other plants around the home.
CHECKCHECK

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FEEDBACK
• Chemicals may be washed into the nearest river.
• The chemicals may seep into the underground
water supply, and eventually reach the river.
• The chemicals may kill aquatic life including fish
• The chemicals may also destroy plant life on the
bank of the river exposing breeding grounds to
predators.
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 Read the question above and then type your response in the box below.
 You must be in Slide Show View to type and delete text.
FEEDBACK
• The river may become contaminated by faecal matter
from the animals.
• The animals may wade through the water as they
drink water thus affecting water quality.
Now go to the next slide for the final activity.
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 Make a list of at least three ways in which you have directly or indirectly
contributed to the pollution of rivers.
 Make a list of at least three ways in which you personally will attempt to
correct or improve pollution of our rivers.
 Discuss these with each other so that persons with similar goals can work
together.
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• http://images.sciencedaily.com/2009/09/090904071905-large.jpg
• http://www.ec.gc.ca/eau-water/72FDC156-C1A8-49B0-A95A-
F019F48A6984/effects_of_urbanization.gif
• http://images.nationalgeographic.com/wpf/media-
live/photos/000/407/cache/environment-freshwater-san-diego-
7_40741_600x450.jpg
• http://www.care2.com/news/member/683318092/1860050
• http://photos.wildmadagascar.org/images/madagascar_erosion_aerial_0.s
html
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• http://blogs.uww.edu/introtolatinamerica/2011/10/03/deforestation-in-
costa-rica/
• http://www.jamaicancaves.org/cockpit-country-bauxite-mining.htm
• http://jamaica-gleaner.com/gleaner/20051222/lead/lead3.html
• http://www.frontpageafricaonline.com/index.php?
option=com_content&view=article&id=2312:health-hazard-slum-
communities-in-monrovia-at-risk&catid=54:health-matters&Itemid=116
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1. Guiness, P., Nagle, G., Oliphant, K., Rae, A., Rocke. J., Ross, S., Rutter, J.,
Wyllie, A. (2008). Geography for CSEC. UK: Nelson Thornes
2. Sealey, N. (2010). Geography for CSEC Examinations. Oxford: Macmillan
Publishers Ltd.
3. Wilson, M. (2005). The Caribbean Environment for CSEC Geography.
Oxford: Oxford University Press.
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