Development of a Deterministic Catchment Water Quality Model

A deterministic catchment water quality model has been developed. The model integrates rainfall-runoff and catchment water quality model. Rainfall-runoff model has been developed considering the time-area method. Water quality model has been incorporated in the developed rainfall-runoff model for the continuous simulation of different water quality parameters i.e. TSS (Total Suspended Solids), TN (Total Nitrogen) and TP (Total Phosphorus). The model will allow user to calculate time of concentration using a range of established methods. Also, model will allow user to use any parameters for different types of selective continuing losses (i.e. constant, linearly varying or exponentially varying). The basic difference of this model with the Urban Stormwater Improvement Conceptualisation (MUSIC) model is that it is a deterministic model, which will simulate actual quality of the runoff, instead of stochastic pattern. Model output has been analysed using Queensland catchment and real rainfall event. Eventually, a sensitivity analysis has been performed.