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Rainfall Grade 8 Lesson

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Isaac Katete

This document provides information about measuring rainfall using a rain gauge. It discusses the different parts of a rain gauge including a copper cylinder, funnel, and collecting jar. It explains how to properly set up a rain gauge by placing it 1 meter above the ground away from tall structures. Finally, it mentions that rainfall is recorded by taking readings from the collecting jar 45 minutes after rain falls.

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Geography Grade 8 A Neemtree Primary School
Lesson :- Geography Welcome to todays geography lesson.
Lesson :- Geography In the last lesson we learnt about elements of weather and climate.
Lesson :- Geography Question .1. What do we call the place where the elements of weather & climate are recorded?
Answer: Weather or Meteorological station
Mention the elements of weather and climate that are recorded at the meteorological station. Answer i. Rainfall ii. Temperature iii. Humidity . iv. Air Pressure v. Sunshine vi. Cloud Cover vii. Wind Speed viii. Wind Direction
INSTRUMENT FOR MEASURING RAINFALL From the diagram below ,which letter represents the instrument used for measuring rainfall? A B . . . . . C Answer = B
What is name of this diagram used for measuring rainfall? Answer i. Rain gauge
PARTS OF THE RAIN GAUGE Study the diagram and compare with the diagram on your card A B Copper Cylinder Funnel CGlass Bottle/Glass Jar Collecting Jar DOuter Casing E Measuring Cylinder
MEASURING THE AMOUNT OF RAINFALL In your own thinking ,how is rainfall measured? There are two parts you need to take care when measuring rainfall. 1. How to set up the rain gauge before rains come 2. How to record the the reading after the rains
MEASURING THE AMOUNT OF RAINFALL Setting Up a rain gauge i. Place the copper cylinder in the ground with 30cm projecting above the ground protected by the outer casing. ii. Insert the glass jar in the copper cylinder. iii. Place the funnel with the diameter of 12.7 cm into the copper cylinder ( see the diagramme from your cards).
This is how the diagramme should be arranged. A B Copper Cylinder Funnel CGlass Bottle/Glass Jar Collecting Jar DOuter Casing E Measuring Cylinder
PRECAUTIONS WHEN SETTING UP A RAINGAUGE. How to set up a rain gauge before rainfall is recorded i. Place rain gauge 1 meter above the ground . This helps to avoid splashes from the ground. ii. Its should be positioned away from tall buildings, trees and other high objects. These objects can either block the amount of rainfall to be recorded or the runoff water can be recorded as well. iii. Clean the rain gauge before rainfall or after along drought period. iv. Take the readings 45 minutes after rain falls.
Recording Rainfall Watch the video clip How is rainfall recorded ? Create your first presentation
Exercise. What is the name of the instrument used for measuring rainfall? Mention three parts of the rain gauge. How is rainfall recorded? Create your first presentation

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Rainfall Grade 8 Lesson

  • 1. Geography Grade 8 A Neemtree Primary School
  • 2. Lesson :- Geography Welcome to todays geography lesson.
  • 3. Lesson :- Geography In the last lesson we learnt about elements of weather and climate.
  • 4. Lesson :- Geography Question .1. What do we call the place where the elements of weather & climate are recorded?
  • 6. Mention the elements of weather and climate that are recorded at the meteorological station. Answer i. Rainfall ii. Temperature iii. Humidity . iv. Air Pressure v. Sunshine vi. Cloud Cover vii. Wind Speed viii. Wind Direction
  • 7. INSTRUMENT FOR MEASURING RAINFALL From the diagram below ,which letter represents the instrument used for measuring rainfall? A B . . . . . C Answer = B
  • 8. What is name of this diagram used for measuring rainfall? Answer i. Rain gauge
  • 9. PARTS OF THE RAIN GAUGE Study the diagram and compare with the diagram on your card A B Copper Cylinder Funnel CGlass Bottle/Glass Jar Collecting Jar DOuter Casing E Measuring Cylinder
  • 10. MEASURING THE AMOUNT OF RAINFALL In your own thinking ,how is rainfall measured? There are two parts you need to take care when measuring rainfall. 1. How to set up the rain gauge before rains come 2. How to record the the reading after the rains
  • 11. MEASURING THE AMOUNT OF RAINFALL Setting Up a rain gauge i. Place the copper cylinder in the ground with 30cm projecting above the ground protected by the outer casing. ii. Insert the glass jar in the copper cylinder. iii. Place the funnel with the diameter of 12.7 cm into the copper cylinder ( see the diagramme from your cards).
  • 12. This is how the diagramme should be arranged. A B Copper Cylinder Funnel CGlass Bottle/Glass Jar Collecting Jar DOuter Casing E Measuring Cylinder
  • 13. PRECAUTIONS WHEN SETTING UP A RAINGAUGE. How to set up a rain gauge before rainfall is recorded i. Place rain gauge 1 meter above the ground . This helps to avoid splashes from the ground. ii. Its should be positioned away from tall buildings, trees and other high objects. These objects can either block the amount of rainfall to be recorded or the runoff water can be recorded as well. iii. Clean the rain gauge before rainfall or after along drought period. iv. Take the readings 45 minutes after rain falls.
  • 14. Recording Rainfall Watch the video clip How is rainfall recorded ? Create your first presentation
  • 15. Exercise. What is the name of the instrument used for measuring rainfall? Mention three parts of the rain gauge. How is rainfall recorded? Create your first presentation