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JSS3: BASIC SCIENCE - 1ST TERM

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  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
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Drainage is any system used to remove excess water from land.

Drainage can be either natural or artificial. Many areas have some natural drainage; this means that excess water flows into lakes and rivers. Natural drainage, however, is often inadequate, and artificial or man-made drainage is required.

Different Types of Drainage:

There are two types of artificial drainage: surface drainage and subsurface drainage.

Surface Drainage:

Surface drainage is the removal of excess water from the surface of the land. This is normally accomplished by shallow ditches, also called open drains.

surface drainage

Subsurface Drainage:

Subsurface drainage is the removal of water from the root zone. It is accomplished by deep open drains or buried pipe drains.

Subsurface Drainage

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