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The volume of water pumped in flow phase is calculated through a function which is also used in ordering phase as calculation for expected pump volume. If storage upstream did does not release enough water to meet the expected pump requirement, or some released water gets loss on the way from storage to pipe site, then the actual water arrives pipe site is less than what the pipe site asked, the pipe site would still pumped pump out its originally planned pump volume, such as pipe junction plans to pump 100ML, but only 80ML gets to pipe junction, then pipe junction would still pump 100ML out, and system will give an error to remind modeller that there is a difference here, so modeller needs to consider more loss into the pump flow function.
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In NetLP system, Source works out an optimal way to pass water requirements and release water to meet these requirements at the lowest cost, so the expected pump volume will always be the same as actual pump volume. For each pipe junction relationship, pump capacity and pump cost are the key factors to that will affect flow direction in the whole system. Capacity determines the maximum pump capability that a pipe junction can pump out for that pump direction. Cost defines pump cost for each ML water pumped for this pump connection relationshipper ML. It can be quite sensitive for a certain cost range compared to costs of other water supply options.
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