Table 2. List of extreme rainfall... | Emerald Publishing

Table 2.

List of extreme rainfall indices established by the WMO

Index	Indicator name	Definitions	Units
SDII	Simple daily intensity indices	Annual total rainfall divided by the number of wet days (defined as PRCP ≥ D 1.0 mm) in the year	mm day-1
R10	Number of heavy rainfall days	Annual count of days when PRCP ≥ D 10 mm	days
R20	Number of very heavy rainfall days	Annual count of days when PRCP ≥ D 20 mm	days
R25	Number of days above mm	Annual count of days when PRCP ≥ D 25 mm	days
CDD	Consecutive dry days	Maximum number of consecutive days with RR ≤ 1mm	days
CWD	Consecutive wet days	Maximum number of consecutive days with RR ≥D 1 mm	days
R95p	Very wet days	Annual total PRCP when RR > 95th percentile	mm
R99p	Extremely wet days	Annual total PRCP when RR > 99th percentile	mm

Index	Indicator name	Definitions	Units
SDII	Simple daily intensity indices	Annual total rainfall divided by the number of wet days (defined as PRCP ≥ D 1.0 mm) in the year	mm day-1
R10	Number of heavy rainfall days	Annual count of days when PRCP ≥ D 10 mm	days
R20	Number of very heavy rainfall days	Annual count of days when PRCP ≥ D 20 mm	days
R25	Number of daysabove mm	Annual count of days when PRCP ≥ D 25 mm	days
CDD	Consecutive dry days	Maximum number of consecutive days with RR ≤ 1mm	days
CWD	Consecutive wet days	Maximum number of consecutive days with RR ≥D 1 mm	days
R95p	Very wet days	Annual total PRCP when RR > 95th percentile	mm
R99p	Extremely wet days	Annual total PRCP when RR > 99th percentile	mm

Note:

PRCP is the daily precipitation amount; RR is the daily precipitation amount on day

Source: Xu et al. (2015)