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PDD and demand driven analysis difference

Hello, I have modeled an agricultural water distribution network using water gems in which 10 similar pumps are operated in parallel. when I run the model based on the conventional approach of demand-driven analysis all those 10 pumps are operated delivering a flow rate of 2900 lps. unlike demand driven method when I run the model using pressure dependent demand method (PDD), only 8 pumps(2 pumps are off) are operated delivering  2600 lps flow with a deficit of supplied demand in junctions. does anyone know the reason? thank you in advance