1.5189 inches of rain fell during this 18 min period.
What is the unit of rainfall?The amount of rain that fell in total over a specific time period, measured in millimeters, is the most typical rainfall measurement.
Area = 57.0 km² = 57.0 × 1000 × 1000 m²
Volume of water = 5.81 × 10⁸ gallon = 5.81 × 10⁸ × 0.00378541 m³ = 2199323.21 m³
Hence, the height of the rain water
= (2199323.21 m³) ÷ (57.0 × 1000 × 1000 m²)
= 0.03858 m
= 0.03858 × 39.3701 inch
= 1.5189 inch
So, 1.5189 inches of rain fell during this 18 min period.
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