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In order to create a reliable model of monthly flow rate, the value of each input factor, cumulative monthly precipitation P and the average monthly temperature T, is coded on three levels (Table 2): the lower level of the interval, as a minimum observed value (denoted as −1 in coded factor values); the higher level of the interval, as a maximum observed value (denoted as +1 in coded factor values); and the central point of the interval, as a middle between maximum and minimum observed data (denoted as 0 level in coded factor values). Coding of real factor values (i.e., their normalization) is a necessary step for comparison of the parameters’ effect on flow rate independently of their units of measurement.

Table 2

Examined range of values for the chosen input parameters: cumulative monthly precipitation P (mm) and average monthly temperature T (°C)

Input parametersLower interval level (coded value)Central interval level (coded value)Higher interval level (coded value)
P (mm) 1.80 ( − 1) 79.85 (0) 157.90 ( + 1) 
T (°C) −7.00 ( − 1) 8.9 (0) 24.80 ( + 1) 
Input parametersLower interval level (coded value)Central interval level (coded value)Higher interval level (coded value)
P (mm) 1.80 ( − 1) 79.85 (0) 157.90 ( + 1) 
T (°C) −7.00 ( − 1) 8.9 (0) 24.80 ( + 1) 

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