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Class 8 · Geography

Rainfall and water volume

Interactive explanation Gamified quiz, feedback & rewards

0 XP0 mastered
Suggested-level exploration · Learning goals & preparation

By the end, you can…

  • Explain Collected litres = rainfall mm × area m²
  • Change one input at a time and predict its effect before checking the model.
  • Apply the relationship in a quiz and explain the reasoning behind your answer.

Useful preparation: Directions, units and interpreting maps. Suggested previous stop: Map scales.

This topic has a suggested learning level. A matching chapter in the current NCERT edition has not been verified, so it is not labelled as syllabus coverage.

Interactive exploration · Class 8

Rainfall and water volume

Class 8
Ideal collected water (L)01400280042005600050100Rainfall depth (mm)Catchment area (m²) held at 50 · scale adjusts to values
The relationshipCollected litres = rainfall mm × area m²
01 · How to explore

Make the idea your own

  1. 1Read the inputs and predict what will change.
  2. 2Change one parameter while keeping the other fixed.
  3. 3Explain the result using the diagram and the live values.
02 · Take it further

Notice the pattern

One millimetre of rain over one square metre equals one litre.