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A river basin has an area of 200 km². If the average rainfall is 1000 mm per yea

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Question: A river basin has an area of 200 km². If the average rainfall is 1000 mm per year, what is the total volume of water received by the basin in a year?

Options:

  1. 200 million m³
  2. 100 million m³
  3. 300 million m³
  4. 400 million m³

Correct Answer: 200 million m³

Solution: 

Volume = Area × Rainfall = 200 km² × 1000 mm = 200 km² × 1 m = 200 million m³.

A river basin has an area of 200 km². If the average rainfall is 1000 mm per yea

Practice Questions

Q1
A river basin has an area of 200 km². If the average rainfall is 1000 mm per year, what is the total volume of water received by the basin in a year?
  1. 200 million m³
  2. 100 million m³
  3. 300 million m³
  4. 400 million m³

Questions & Step-by-Step Solutions

A river basin has an area of 200 km². If the average rainfall is 1000 mm per year, what is the total volume of water received by the basin in a year?
  • Step 1: Understand the area of the river basin, which is given as 200 km².
  • Step 2: Understand the average rainfall, which is given as 1000 mm per year.
  • Step 3: Convert the rainfall from millimeters to meters. Since 1000 mm is equal to 1 meter, we have 1 m of rainfall.
  • Step 4: Use the formula for volume, which is Volume = Area × Rainfall.
  • Step 5: Substitute the values into the formula: Volume = 200 km² × 1 m.
  • Step 6: Calculate the volume: 200 km² × 1 m = 200 million m³ (since 1 km² = 1 million m²).
  • Area and Volume Calculation – Understanding how to calculate the volume of water based on area and rainfall measurements.
  • Unit Conversion – Converting rainfall from millimeters to meters to ensure consistent units when calculating volume.
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