Using Turbidity to Determine Total Suspend Solids - Field Measurement: Dez Dam Reservoir

Elfimov Valery Ivanovich, Khakzad Hamid



One part of water quality, Total SuspendedSolids (TSS), is a reliable indicator of other pollutants, particularly nutrients and metals that carried on the surfaces of sediment in suspension. The measurement of TSS (APHA, 1995) is time consuming, and much research has been done to correlate secondary parameters to TSS, but the process of turbidity measurement is simpler and faster than the process of TSS measurement. The correlation between TSS and turbidity established to provide more efficiency in predicting total suspended solids concentration in dam reservoir. A positive correlation between total suspended solids concentration and turbidity level, suggested measurement of turbidity possibly, is the most profitable option for estimating total suspended solids concentration in dam reservoir. A random study was conducted from Jan 2002 to July 2003 in Dez dam reservoir. Dez dam reservoir in Iran is facing a serious sedimentation problem and its dead volume will be quite full in the coming 10 years, and now the inflow water in hydropower conduit system is becoming turbid. These results strongly suggest that, turbidity is an appropriate monitoring parameter where TSS must be evaluated and the measurement of turbidity levels has the potential to replace the measurement of TSS concentrations.

Keywords: Dez Dam Reservoir; total suspended solids; turbidity; water quality