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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 

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  •  I would like to thank you for posting your answer to my question. I need some further information that would answer my question in full   Would you mind defining for me why the calculated demand is different from the base demand? (for instance 55.2 and 69 L/s in j-644 )

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  •  I would like to thank you for posting your answer to my question. I need some further information that would answer my question in full   Would you mind defining for me why the calculated demand is different from the base demand? (for instance 55.2 and 69 L/s in j-644 )

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