Pipe junction functionality is provided in Source to allow modelling of bidirectional flows between storage. pumping water from one place to another. It can be used to model pumped water supply, bidirectional flows between storages and so on.
Scale
Model operates at the site scale and at any time step Source is capable of using (e.g. daily).
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Automatically installed with Source.
Rule based ordering
In rule based ordering system, for each pipe junction relationship, expected pumping water 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.
The volume of water pumped in flow phase is calculated through a function which is also used in ordering phase as expected pumping volume. If storage upstream did not release enough water to meet the expected pumping 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 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.
NetLP
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 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.
Key assumptions
Assumptions:
- In rule based ordering system, the volume of pumped water is assumed to be the same as expected pumping volume even there is shortfall. So it is important to take all possible losses into consideration when defining the expected pumping volume.
- No loss and no time delay apply during pump process.
Input data
Refer to the Source User Guide for detailed data requirements and formats.
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