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Table 2 shows water quality parameters in the storage tanks where the inflow water to sector A (cross junctions) originated. In this scenario water entered the junction from the North and South inlet pipes where the incoming flows struck against each other and exited through the West and East outlets. These flow regimes resulted in a perfect mixing condition where the resultant water quality parameters in each outlet was similar (Table 8). In a previous study, we observed that complete mixing was achieved for two varying opposing inflows due to the collision of the fluid stream (Mompremier et al. 2015). During the experiments, it is observed that the incoming flows collided in the junction; provoked turbulence along the impinging interface then exited through the outlet pipes. Free chlorine concentrations in both outlets were equal. Similar configurations have been studied by Ho & O'Rear (2009), where junctions consisting of two opposing inlets with equal and unequal pipe sizes; different combination of flow rates were investigated and yielded results equivalent to perfect mixing.

Table 8

Flow and water quality parameters at inlets and outlets of sector A for scenario 2

Sampling pointsFlow rates (L/s)Chlorine (mg/L)pHTemperature (°C)Turbidity (NTU)TOC (mg/L)Total coliforms (CFU)E. coli (CFU)
North inlet 0.50 0.60 19.8 1.1 0.51 0.0 0.0 
South inlet 0.84 1.05 18.1 1.6 0.57 0.0 0.0 
West outlet 0.68 0.88 17.3 1.2 0.52 0.0 0.0 
East outlet 0.66 0.88 17.5 1.2 0.53 0.0 0.0 
Sampling pointsFlow rates (L/s)Chlorine (mg/L)pHTemperature (°C)Turbidity (NTU)TOC (mg/L)Total coliforms (CFU)E. coli (CFU)
North inlet 0.50 0.60 19.8 1.1 0.51 0.0 0.0 
South inlet 0.84 1.05 18.1 1.6 0.57 0.0 0.0 
West outlet 0.68 0.88 17.3 1.2 0.52 0.0 0.0 
East outlet 0.66 0.88 17.5 1.2 0.53 0.0 0.0 

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