The difference between short-duration rainfall by automatic recording and manual observation

Using the minute rainfall data by Automatic Recording and Manual Observation at the same period from 2005 to 2007 years, which come from 11 national weather stations in Hubei Province, such as Huangshi station. Extracted the maximum rainfall and the corresponding time year by year, and durations of rainfall are 5, 10, 15, 20, 30, 45, 60, 90, 120, 150, 180 minutes respectively. The deviation of time, the deviation of rainfall, and the deviation of rainfall within the specific time are analyzed. The result shows, the deviation of the starting time range from 0 to 10 minutes basically, Most of them accounting for more than 70.0% of the samples. The two sets of data selected the same precipitation process, and the judgment of the precipitation process were basically the same. The range of the rainfall deviation is basically within ±10%, accounting for 68.6% of the total samples. Accounting for 60.9% of the samples, the automatic data are larger than the manual one. Setting the time deviation range from 0 to 5 mins, when the automatic and short-duration rainfall data deviation is within ±10% and ±5%, the sample ratio is 76.6% and 54.4%, respectively. Reducing the time deviation to less than 2 mins, and the short-duration rainfall results extracted from the two sets of data are much more consistent. Using the analysis results above, The relation equations of short-duration rainfall between the Automatic and Manual data were established.