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A river basin has an area of 2000 km². If the average rainfall is 800 mm per yea

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Question: A river basin has an area of 2000 km². If the average rainfall is 800 mm per year, what is the total volume of water received by the basin in cubic meters? (2000)

Options:

  1. 1.6 billion m³
  2. 1.2 billion m³
  3. 1 billion m³
  4. 800 million m³

Correct Answer: 1.6 billion m³

Exam Year: 2000

Solution: 

Volume = Area × Rainfall = 2000 km² × 0.8 m = 1.6 billion m³.

A river basin has an area of 2000 km². If the average rainfall is 800 mm per yea

Practice Questions

Q1
A river basin has an area of 2000 km². If the average rainfall is 800 mm per year, what is the total volume of water received by the basin in cubic meters? (2000)
  1. 1.6 billion m³
  2. 1.2 billion m³
  3. 1 billion m³
  4. 800 million m³

Questions & Step-by-Step Solutions

A river basin has an area of 2000 km². If the average rainfall is 800 mm per year, what is the total volume of water received by the basin in cubic meters? (2000)
  • Step 1: Understand the area of the river basin, which is given as 2000 km².
  • Step 2: Convert the area from square kilometers to square meters. 1 km² = 1,000,000 m², so 2000 km² = 2000 × 1,000,000 m² = 2,000,000,000 m².
  • Step 3: Understand the average rainfall, which is given as 800 mm per year. Convert this to meters. 800 mm = 800 / 1000 m = 0.8 m.
  • Step 4: Calculate the total volume of water received by the basin using the formula: Volume = Area × Rainfall.
  • Step 5: Substitute the values into the formula: Volume = 2,000,000,000 m² × 0.8 m.
  • Step 6: Perform the multiplication: 2,000,000,000 × 0.8 = 1,600,000,000 m³.
  • Step 7: Convert the volume to billions of cubic meters: 1,600,000,000 m³ = 1.6 billion m³.
  • Area and Volume Calculation – Understanding how to calculate the volume of water based on area and rainfall.
  • Unit Conversion – Converting rainfall from millimeters to meters for accurate volume calculation.
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