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In rule based ordering system, for each pipe junction relationship, expected pumping water pump volume can be defined through a function which should take into account any possible losses, such as evap loss, water travel loss. It is assumed to have no loss during pump process. The amount of water pumped out equals the amount of water pumped in. No time delay applies in pipe junction, the water pumped out gets to its destination within the same model time step.
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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 expected pumping pump volume. If storage upstream did not release enough water to meet the expected pumping 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 out its originally planned pumping 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 pumped pump volume. For each pipe junction relationship, pump capacity and pump cost are the key factors to 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 out from this pipe junction site. It can be quite sensitive for a certain cost range compared to costs of other water supply options.
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- In rule based ordering system, the volume of pumped water is assumed to be the same as expected pumping pump volume even there is shortfall. So it is important to take all possible losses into consideration when defining the expected pumping pump volume.
- No loss and no time delay apply during pump process.
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