To determine the correlation between the flow rate and SS concentrations,
water sample collection and flow rate measurement
were performed during the dry and wet seasons. The collected
water quality and hydrological data were analyzed to evaluate
the correlation between SS and flow rate (Cencic and Rechberger,
2008). The obtained correlation was used for the development of
SS sub-model and was then linked to the WASP model for direct
SS estimation. To obtain the immediate RPI value and determine
the river water quality status, RPI index was embedded into the
WASP model for direct RPI calculation. Fig. 3 presents the simulation
process using RPI and WASP. Fig. 4 presents the process of the
modeling procedure repeated for each segment until all segments
met the requirements. The developed decision-making process
could be used for the pollutant loading evaluation.