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If it is one Cm, it is one cm rainfall. Tomeasure accurately, a measuring glass of 1/10 th base areaof the rain gauge will be used. So 1 cm will go up toa height of 10 Cm but will be calibrated as only 1Cm.
Herein, what does 1 cm rain mean?
The "length", or more accurately, "depth" being measuredis the depth of rain water that would accumulate on aflat, horizontal and impermeable surface during a given amount oftime, typically an hour. One millimeter of rainfall is theequivalent of one liter of water per square meter.
Also asked, how much rain is a lot mm?
Moderate rain: Greater than 0.5 mm perhour, but less than 4.0 mm per hour. Heavy rain:Greater than 4 mm per hour, but less than 8 mm perhour. Very heavy rain: Greater than 8 mm per hour.Slight shower: Less than 2 mm per hour.
Forecast means prediction of a future event.Therefore, it may or may not take place. 2 mm ofrainfall on weather forecast means that there is apossibility of rainfall having a depth of 2 mm. Here,mm is the unit of rainfall measurement, thatrepresents the amount of ponded water on a flat surface ifcollected.