Geography Grade 8 A

Neemtree Primary School

Lesson :- GeographyWelcome to today’s geography lesson.

Lesson :- Geography In the last lesson we learnt about elements of weather and climate.

Lesson :- GeographyQuestion .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. Rainfallii.Temperatureiii.Humidity .iv.Air Pressurev. Sunshine vi.Cloud Cover vii.Wind Speedviii. 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 JarCollecting 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 JarCollecting 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 clipHow 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