Comparison of Statistical Methods to Graphical Methods in Rainfall Trend Analysis: Case Studies from Tropical Catchments

Table 7

Comparison results for monthly rainfalls for Denawaka Ganga catchment.

Month	Trends
	Allupola estate		Hapugastenna estate		Galaboda estate		Lellopitiya estate		Landsdown middle division estate
	Statistical	Graphical	Statistical	Graphical	Statistical	Graphical	Statistical	Graphical	Statistical	Graphical
Jan	No	Yes—up	No	No	No	No	No	No	No	No
Feb	No	No	No	Yes—down	No	No	No	No	No	No
Mar	No	No	No	No	Yes—up	Yes—up	No	Yes - up	No	No
Apr	No	No	No	No	Yes—up	No	No	No	No	No
May	No	No	No	No	Yes—up	No	No	No	No	Yes—up
Jun	No	No	No	No	No	No	No	No	No	Yes—up
Jul	No	No	No	Yes—down	No	No	No	No	Yes—down	No
Aug	No	No	No	No	Yes—up	No	No	No	No	Yes—up
Sep	No	No	No	No	No	No	No	No	No	No
Oct	No	No	No	Yes—down	No	No	No	No	No	No
Nov	No	No	No	No	Yes—up	No	No	No	No	No
Dec	No	No	No	No	No	No	No	No	No	No