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EPANET violating conservation of mass?

EPANET violating conservation of mass?

(OP)
Hello all,

I'm designing a network where the main tank is filled by a pump, and there are many other tanks connected downstream, fed by gravity from the main tank (it's a distribution network in a developing country). I set the pump to deliver the average daily flow of the entire system, calculated as the sum of ADF from all water taps, which was confirmed by graphing "system flow". The graph shows continuous production of the ADF, and a larger consumption at peak hours, as expected. All of the water taps function 6 hours per day, and so have a peaking factor of 4.

The problem is that in a simulation of several days of system operation, the daily minimum water level in the large tank at the top of the system gets lower and lower. The pumping only keeps up with outflow from this tank when it is set to about 120% of average daily flow. Any ideas on where the water could be going?

Thanks,

Ben

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