Table 4. Mann–Whitney abrupt change test of the temperature, precipitation and runoff in annual and seasonal time scale during the study period 1961–2010 for the Qira River basin.

Variable	Period	N	U	H 0	ACP	Mean value	RI
AN-AT	1961–1996	36	−5.24*	R	1997	0.44	207.40%
	1997–2010	14				1.37
AN-AP	1961–1986	26	−2.36*	R	1987	134.48	20.48%
	1987–2010	24				162.02
AN-AR	1961–1994	34	2.01*	R	1995	1.29	-19.81%
	1995–2010	16				1.04
SP-AT	1961–1996	36	−4.26*	R	1997	1.87	64.90%
	1997–2010	14				3.09
SU-AT	1961–1996	36	−2.65*	R	1997	10.87	4.37%
	1997–2010	14				11.34
AU-AT	1961–1996	36	−4.63*	R	1997	0.61	176.93%
	1997–2010	14				1.68
WI-AT	1961–1996	36	−3.19*	R	1997	−11.41	10.66%
	1997–2010	14				−10.19
SU-AP	1961–1986	26	−2.24*	R	1987	68.21	61.68%
	1987–2010	24				110.29
SU-AR	1961–1994	34	2.12*	R	1995	0.94	−15.81%
	1995–2010	16				0.79

Notes.

R denotes rejected.

ACP and RI stand for abrupt change point and rate of increment, respectively.

^*signifies that statistic of Mann–Whitney is significant at the 0.01 level.