Validation of EC and TDS prediction model efficiency in Maroun River (case study: Behbahan station)

Maroon River is one of the tributaries of Jarahi River and one of the important rivers of Khuzestan province. The importance of quality studies of Maroon River is clear from the fact that this river provides water for cities, villages and thousands of hectares of agricultural lands and industrial factories and finally leads to Shadegan Wetland. Attention and importance to this river is one of the requirements for sustainable development and water quality study of this river is of special importance. Water quality is determined by some physical, chemical and biological characteristics. In this study, the models of the relationship between the two parameters of electrical conductivity (EC) and total soluble solids (TDS) during the years 1346 to 88 fit and the amount of TDS in the future is estimated and finally the validity of this prediction is calculated. The results show that in a sampling period from 1346 to 1388 in Behbahan station, the best fitting model between TDS and EC in this station is the exponential model with a correlation coefficient of 0.913. Having the EC value during the years 1389 to 1392, the amount of TDS in this period was estimated and to select the best model, the amount of EF (model efficiency) was calculated for 4 models and it was found that the exponential model with an efficiency of 99.72% is appropriate. The most common model for estimating the amount of TDS is linear, power and logarithmic models in the next priority ranks in Behbahan station.