The difference between rainfall by automatic recording and manual observation depend on minute data

Using the minute rainfall data by Automatic Recording and Manual Observation and the raingauge data at the same period for nine years from Wuhan, Huangpi and Huangshi weather stations, the annual rainfall, monthly rainfall, the variation degree of daily rainfall, the process of short-duration rainfall(storm), and the amount of short-duration rainfall are compared between the two observation mode. The result shows that the rainfall amount by automatic recording is much larger than that by manual observation, The degree of deviation between the two methods is mainly within±10%. The rainfall observed by automatic method is much more consistent to the result of raingauge than that by annual observation. The daily short duration (for 5 minutes) rainfall series between automatic and annual observations are highly correlated.