Detecting Abrupt Change of Streamflow at Lintong Station of Wei River

Table 1

Total monthly runoff volumes measured at the Lintong station in the Wei River basin.

Month	First stage; /(10^8 m³)	Second; stage; /(10^8 m³)	Mean difference /(10^8 m³)	Rate of migration	Third; stage; /(10^8 m³)	Mean difference; (10^8 m³)	Rate of migration	Fourth; stage; /(10^8 m³)	Mean; difference; /(10^8 m³)	Rate of migration
January	2.31	1.24	−1.07	−46%	1.44	0.2	16%	1.95	0.51	35%
February	2.33	1.36	−0.97	−42%	1.52	0.16	12%	1.94	0.42	28%
March	3.96	1.73	−2.23	−56%	2.36	0.63	36%	2.38	0.02	1%
April	7.24	2.92	−4.32	−60%	3.51	0.59	20%	2.67	−0.84	−24%
May	10.19	4.19	−6	−59%	4.95	0.76	18%	3.76	−1.19	−24%
June	4.63	1.98	−2.65	−57%	5.19	3.21	162%	11	5.77	111%
July	11.06	8.4	−2.66	−24%	8.7	0.3	4%	6.83	−1.87	−21%
August	7.69	9.67	1.98	26%	8.1	−1.57	−16%	12.2	4.11	51%
September	17.11	13.94	−3.17	−19%	8.02	−5.92	−42%	11.4	3.42	43%
October	14.51	9.34	−5.17	−36%	7.33	−2.01	−22%	12.5	5.16	70%
November	7.55	4.32	−3.23	−43%	3.81	−0.51	−12%	4	0.19	5%
December	3.77	1.68	−2.09	−55%	1.7	0.02	1%	2.59	0.89	52%