1. What is Rainfall Measurement?

Rainfall measurement is the process of determining the amount of precipitation that has fallen over a specific area during a given time period, typically expressed in millimeters (mm).

2. How Rainfall is Measured

The most basic method of measuring rainfall is using a standard rain gauge:

Where:

• Gauge Reading — The height of collected water in the gauge (mm)

Explanation: The rain gauge collects precipitation over a set period, and the depth of water is measured directly.

3. Importance of Rainfall Calculation

Details: Accurate rainfall measurement is crucial for weather forecasting, flood prediction, agricultural planning, and water resource management.

4. Using the Calculator

Tips: Enter the gauge reading in millimeters (mm). The value must be ≥ 0.

5. Frequently Asked Questions (FAQ)

Q1: What is a standard rain gauge?
A: A standard rain gauge is a cylindrical container that collects and measures liquid precipitation, typically with a diameter of 203mm.

Q2: How often should rainfall be measured?
A: Rainfall is typically measured daily at the same time each day, but can be measured more frequently during storms.

Q3: What affects rainfall measurement accuracy?
A: Wind, evaporation, gauge placement, and splashing can all affect measurement accuracy.

Q4: How is snowfall measured?
A: Snowfall is typically melted and measured as liquid equivalent, or measured by depth with a known density conversion factor.

Q5: What's the difference between rainfall amount and intensity?
A: Amount is the total precipitation, while intensity is the rate of precipitation (e.g., mm per hour).