Drought Analysis in East Nusa Tenggara (Indonesia) Using Regional Frequency Analysis

Table 7

Estimated rainfall return period for drought conditions of 10%, 20%, 30%, 40%, and 50% of normal rainfall.

% drought	Measure	Region
		1	2	3	4	5
10% normal	Average rainfall	0.33	1.11	0.34	0.55	0.3
		0.0211	0.1131	0.06	0.0856	0.1026
	Return period	47 y 4 m	8 y 10 m	16 y 8 m	11 y 8 m	9 y 9 m
20% normal	Average rainfall	0.66	2.22	0.68	1.1	0.59
		0.213	0.2033	0.2569	0.2419	0.2559
	Return period	4 y 8 m	4 y 11 m	3 y 11 m	4 y 2 m	3 y 11 m
30% normal	Average rainfall	0.99	3.33	1.03	1.65	0.88
		0.3153	0.2811	0.3561	0.3369	0.35
	Return period	3 y 2 m	3 y 7 m	2 y 10 m	3 y	2 y 10 m
40% normal	Average rainfall	1.32	4.44	1.37	2.2	1.18
		0.3935	0.3507	0.4288	0.4102	0.4207
	Return period	2 y 6 m	2 y 10 m	2 y 4 m	2 y 5 m	2 y 5 m
50% normal	Average rainfall	1.65	5.55	1.72	2.75	1.47
		0.4571	0.4618	0.488	0.4701	0.4793
	Return period	2 y 2 m	2 y 2 m	2 y 1 m	2 y 2 m	2 y 1 m

Note: shows the chance of an event returning; % drought shows the percentage of rainfall below normal conditions.