*3.2. Ground Rainfall Measurements*

Hourly and daily precipitation records from 2009 to 2017 at a total of 13 rainfall stations in the SRB (Figure 1) are obtained from the hydrological yearbook series published by Ministry of Water Resources of China. The rain gauges used at the rainfall stations are tipping buckets. All of the rainfall data have gone through strict quality control following the relevant China's industry standards such as QX/T 118-2010 (quality control of surface meteorological observation data) before being published. There are no rainfall data missing at the 13 stations. In the SRB, daily rainfall has been recorded throughout the year, while hourly rainfall only documented for the relatively wet period from April to October. Correspondingly, the monthly and daily estimates of the SPPs are evaluated throughout the year, while their hourly estimates are only assessed within the seven months.
