Does catching hole size matter on rain gauge?

Answer 1

Yes, catching hole size does matter in a rain guage.

You are measuring rain depth, so you collect it in the guage. The rate of collection is proportional to the area of the hole. If the area of the hole were the same as the cross sectional area of the measuring tube, then the level of rain in the tube would be the same as the level of rain outside. If the area of the hole were larger than the cross sectional area of the tube, then the level of rain in the tube would increase faster than the level of rain outside. This can be used to increase the sensitivity of the guage.

Answer 2

Yes, catching hole size on a rain gauge matters because it determines how much rainfall the gauge can accurately measure. If the catching hole is too small, it may not collect enough rain for an accurate measurement, while a hole that is too large might lead to an overestimation of rainfall. It is important to ensure that the catching hole is properly sized and maintained to ensure accurate rainfall measurements.