Changes in Extreme Precipitation in the Mekong Basin

Table 1

Summary of eight precipitation indices. Note: PR is precipitation; wet days are when daily PR is ≥1.0 mm.

Category	Index	Description	Definition	Unit
Threshold indices	R10 mm	Number of moderate PR days	Annual number of days when daily PR is ≥10 mm	days
	R20 mm	Number of heavy PR days	Annual number of days when daily PR is ≥20 mm	days
Percentile indices	R95p	Total PR from over wet days	Annual sum when daily PR is >95th percentile	mm
	R99p	Total PR from terribly wet days	Annual sum when daily PR is >99th percentile	mm
Absolute indices	Rx5day	Max. 5-day PR	Annual maximum of 5-day PR total	mm
	Rx1day	Max. 1-day PR	Annual maximum of 1-day PR total	mm
Other indices	PRCPTOT	Annual total wet-day PR	Annual sum from wet days	mm
	SDII	Daily PR intensity	Annual average daily PR from wet days	mm/day