The formula for calculating the concentration of pollutants in Heihe River:

In the formula:

C——Black sap flow concentration, mg/l

C_p——the concentration of wastewater pollutants, mg/l

Q_p——discharge of wastewater, m³/s

C_h——the concentration of pollutants upstream of the river, mg/l

Q_h——river flow, m³/s

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