Back to Course

JSS3: BASIC SCIENCE - 1ST TERM

0% Complete
0/0 Steps
  1. Family Traits | Week 1
    6Topics
    |
    1 Quiz
  2. Environmental Hazards I - Soil Erosion | Week 2
    3Topics
  3. Environmental Hazards I - Flooding | Week 3
    5Topics
    |
    1 Quiz
  4. Environmental Hazards II - Bush Burning | Week 4
    4Topics
  5. Environmental Hazards II - Deforestation | Week 5
    4Topics
    |
    1 Quiz
  6. Environmental Hazards III - Desertification | Week 6
    4Topics
    |
    1 Quiz
  7. Environmental Hazards III - Description of the Ozone Layer and its Location in the Atmosphere | Week 7
    3Topics
    |
    1 Quiz
  8. Drug and Substance Abuse | Week 8
    4Topics
    |
    1 Quiz
  9. Resources from Living Things | Week 9
    4Topics
  10. Resources from Non-Living Things | Week 10
    2Topics
    |
    1 Quiz
Lesson Progress
0% Complete

Flooding can be caused by any of the following factors:

1. Poor Drainage System or Lack of Culverts: Poor Drainage Systems are not able to take the pressure of huge water, accumulated due to heavy rain,

Curvet
A culvert is a closed conduit or tunnel used to convey water from one area to another.

2. Breakdown of Dams and Embankments: When the dams are poorly constructed or maintained, they can easily collapse and this results in flooding. 

Dam Failure
Dam Failure

3. Deforestation: When deforestation takes place, the top layer of soil can be dislodged, this is also known as soil erosion. When the top layer of soil is unstable, it is unable to retain any of the water that falls on it, resulting in increased surface run-off, which, in turn, increases the risk of flooding.

Deforestation
Deforestation.

4. Inadequate Urban Planning: In areas where people tend to build structures to block drainage systems, there may be blockage of water channels, and free flow of water is hindered which may lead to flooding. Flooding is the most widespread environmental disaster in Nigeria, and flooding impacts are made worse by poor urban planning.

flooding
In Lagos people live in dread of flooding.

5. Refuse Dumping on Drainage or River channels: Block drainage systems hinder the free flow of water, which may lead to flooding.

Clogged Drainage

6. Erection of Buildings on Water Channels: When water channels are blocked and there is heavy rainfall, the area can become flooded, because the water does not have an outlet to flow away.

7. Excessive/heavy Rainfall in Urban Areas: Flooding in urban areas, caused by intense and/or prolonged rainfall, which overwhelms the capacity of the drainage system, is one of the principal hazards in modern towns and cities.

urban area flooding

8. Bad Agricultural Practices: Bad agricultural practices such as overgrazing, burning of forests, and removal of cover crops can cause soil erosion which leads to flooding.

back-to-top
error: