In the formula, ‘ΔE₀’ and ‘ΔP’ are the changes in potential evapotranspiration and precipitation before and after the mutation period, respectively; ‘’ and ‘’ are the elastic coefficients of runoff to rainfall and potential evapotranspiration, respectively; The ‘’ and ‘’ in the formula is detailed in Table 2.

Table 2

Formula details

Number .	.	.	Literature Resources .
1			Zhang et al. (2001)
2			Fu (1981)
3			Schreiber (1904)
4			Budyko (1948)
5			Pike (1964)
6			Ol'dekop (1911)

Number .	.	.	Literature Resources .
1			Zhang et al. (2001)
2			Fu (1981)
3			Schreiber (1904)
4			Budyko (1948)
5			Pike (1964)
6			Ol'dekop (1911)

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