For each 1000 square feet (92.903 m2) of collecting space
you can roughly get 6 gallons of water (22.7125 litres)
per inch of rain (1 inch = 2.54 cm ... See below)
Rain gauges are thought to be the most ancient weather instruments, and they're believed to have been used in India more than 2,000 years ago. A rain gauge is really just a cylinder that catches rain. If an inch collects in the cylinder, it means an inch of rain has fallen. It's that simple. Most standard rain gauges have a wide funnel leading into the cylinder and are calibrated so that one-tenth of an inch of rain measures one inch when it collects inside. The funnel is 10 times the cross-sectional area of the tube. Rainfall as low as .01 inches can be measured with this instrument. Anything under .01 inches is considered a trace. This standard rain gauge is shown in the following figure.
Source: https://www.infoplease.com/science/weather/weather-measuring-rain
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