Middle School:
Question: On the news this morning, Haroula heard the weather person say, "Yesterday morning's rain totaled 2.4 inches." She is curious what 2.4 inches of rain really means. If it rained at a steady rate from 4 AM to 12 PM, use the chart below to help Haroula determine the type of rain that fell yesterday. (Use 1 inch ≈ 25 mm)
|
Type of Rain |
Rate (in mm/hr) |
|
Light |
x ≤ 0.5 |
|
Moderate |
0.5 < x ≤ 4.0 |
|
Heavy |
4.0 < x ≤ 8.0 |
|
Very Heavy |
x ≥ 8.0 |
Answer: Heavy Rainfall
Solution: Using 1 inch ≈ 25 mm, we find 2.4 inches ≈ 60 mm. Since there are 8 hours from 4 a.m. to 12 p.m. we can find the rate of rainfall over that time period, 60 mm ÷ 8 hours = 7.5 mm/hr. Now, we can use the chart to see 7.5 mm/hr is considered heavy rainfall.
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