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A river basin has an area of 200 square kilometers. If the average rainfall is 8

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Question: A river basin has an area of 200 square kilometers. If the average rainfall is 800 mm per year, how much water (in cubic meters) falls on the basin annually? (2019)

Options:

  1. 160000000 m³
  2. 200000000 m³
  3. 240000000 m³
  4. 320000000 m³

Correct Answer: 160000000 m³

Exam Year: 2019

Solution: 

Water volume = Area × Rainfall = 200 km² × 800 mm = 200000000 m³.

A river basin has an area of 200 square kilometers. If the average rainfall is 8

Practice Questions

Q1
A river basin has an area of 200 square kilometers. If the average rainfall is 800 mm per year, how much water (in cubic meters) falls on the basin annually? (2019)
  1. 160000000 m³
  2. 200000000 m³
  3. 240000000 m³
  4. 320000000 m³

Questions & Step-by-Step Solutions

A river basin has an area of 200 square kilometers. If the average rainfall is 800 mm per year, how much water (in cubic meters) falls on the basin annually? (2019)
  • Step 1: Understand the area of the river basin, which is given as 200 square kilometers.
  • Step 2: Convert the area from square kilometers to square meters. (1 km² = 1,000,000 m², so 200 km² = 200 × 1,000,000 m² = 200,000,000 m²)
  • Step 3: Understand the average rainfall, which is given as 800 mm per year.
  • Step 4: Convert the rainfall from millimeters to meters. (800 mm = 0.8 m)
  • Step 5: Calculate the volume of water that falls on the basin by multiplying the area in square meters by the rainfall in meters. (Volume = Area × Rainfall = 200,000,000 m² × 0.8 m)
  • Step 6: Perform the multiplication to find the total volume of water. (200,000,000 m² × 0.8 m = 160,000,000 m³)
  • Step 7: The final answer is that 160,000,000 cubic meters of water falls on the basin annually.
  • Area and Volume Calculation – Understanding how to calculate the volume of water based on area and rainfall measurements.
  • Unit Conversion – Converting units from square kilometers and millimeters to cubic meters.
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