Impacts of Urbanization on Extreme Regional Precipitation Events

Table 1

Indices for extreme precipitation events and their definitions.

Extreme precipitation index	Name	Symbol	Unit	Definition
Extreme precipitation intensity	Maximum 1-hour precipitation intensity during flood season	Rx1h	mm	Maximum annual 1-hour precipitation during flood season
	Maximum 2-hour precipitation intensity during flood season	Rx2h	mm	Maximum annual 2-hour precipitation during flood season
	Maximum 3-hour precipitation intensity during flood season	Rx3h	mm	Maximum annual 3-hour precipitation during flood season
	Maximum 6-hour precipitation intensity during flood season	Rx6h	mm	Maximum annual 6-hour precipitation during flood season
	Maximum 12-hour precipitation intensity during flood season	Rx12h	mm	Maximum annual 12-hour precipitation during flood season
	Maximum 24-hour precipitation intensity during flood season	Rx24h	mm	Maximum annual 24-hour precipitation during flood season
Extreme precipitation frequency	Number of heavy precipitation hours	R99p	h	Number of hours during which hourly precipitation is greater than the 99-percentile threshold value
	Number of heavy-rain days	R25mm	d	Number of days during which daily precipitation is greater than 25 mm
	Number of rainstorm days	R50mm	d	Number of days during which daily precipitation is greater than 50 mm