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Performed analysis using response surface method indicates that monthly flow rates Q could be obtained by the following equation, where F is given as a function of rainfall P and air temperature T: 
formula
2
Results of the ANOVA test indicate that the developed model is statistically significant (Table 3).
Table 3

ANOVA for developed model (2)

The model termCoefficient for coded factor valuesCoefficient for real factor valuesSum of squaresDegrees of freedomVarianceF valuep-valuesStandard error
Intercept 5.84 4.856 176.89 25.27 210.43  0.041 
0.75 0.035 10.16 10.16 84.58 <0.0001 0.082 
−1.08 −0.0769 43.95 43.95 365.96 <0.0001 0.057 
P × T 0.97 1.137 × 10−6 3.88 3.88 32.30 <0.0001 0.17 
P2 −0.77 −2.296 × 10−4 6.91 6.91 57.55 <0.0001 0.10 
T2 −0.92 1.098 × 10−3 5.64 5.64 46.95 <0.0001 0.13 
P2 × T 1.12 1.152 × 10−5 3.06 3.06 25.47 <0.0001 0.22 
P × T2 −1.17 −5.931 × 10−5 2.51 2.51 20.94 <0.0001 0.26 
R2 0.7924 
Adjusted R2 0.7886 
Predicted R2 0.7848 
The model termCoefficient for coded factor valuesCoefficient for real factor valuesSum of squaresDegrees of freedomVarianceF valuep-valuesStandard error
Intercept 5.84 4.856 176.89 25.27 210.43  0.041 
0.75 0.035 10.16 10.16 84.58 <0.0001 0.082 
−1.08 −0.0769 43.95 43.95 365.96 <0.0001 0.057 
P × T 0.97 1.137 × 10−6 3.88 3.88 32.30 <0.0001 0.17 
P2 −0.77 −2.296 × 10−4 6.91 6.91 57.55 <0.0001 0.10 
T2 −0.92 1.098 × 10−3 5.64 5.64 46.95 <0.0001 0.13 
P2 × T 1.12 1.152 × 10−5 3.06 3.06 25.47 <0.0001 0.22 
P × T2 −1.17 −5.931 × 10−5 2.51 2.51 20.94 <0.0001 0.26 
R2 0.7924 
Adjusted R2 0.7886 
Predicted R2 0.7848 
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