Water flow in EPANET

[Kent]

Hello,

Is there a way to model a pipe that flows in one direction for certain conditions (ie to fill up a tank) and then in the other direction (ie when the tank is full; supplies water demand outwards from the tank)? Or is the demand met for those pipes located before the tank when the tank is being filled and thus reverse flow is not needed when the tank is closed?  I know that the direction of water flow is a parameter you can specify in EPANET and looks to be permanent.

Thanks

Kent 

[Sam Hatchett]

Computed flow will be bidirectional for pipes, which means that positive flow is in the same direction as the pipe orientation, and reverse flow (negative) is in the opposite direction. Or maybe I misunderstand the question.

s

[Santiago Arnalich]

Hi Kent.

I don't understand the question either. Can you clarify?

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[Lucas Vasconcelos]

Epanet allows you to set a pipe's status to open, closed or CV (check valve).

Open or closed are what their names says. Flow occurs from the higher head node to lower head node or no flow goes through.

Check valve allows flow only if the initial node's head is bigger than the end's. This is actually a check valve's function, but these valves' names are completely different in some languages (in Brazilian Portuguese they're called "válvulas de retenção", or something as retention valves) and it might confuse people (as it did to me). 

These status can be changed through rules or controls.

 

[Kent]

Can epanet model water that moves in opposite directions within the same pipe depending on specific conditions (ie rule based control that says to push water in the direction of the tank to fill it to a specific elevation and once filled, push the water from the tank outward in the opposite direction to meet demand of the system?

[Santiago Arnalich]

I am still not sure I understand but here is my take.

Epanet does that on its own. Imagine a tank with only one pipe. At night the tank fills because there are no consumers, during the day, the tank helps meet the demand. You don't have to program anything, the conditions of the system will make it behave like that, just like laws of physics would in reality

I have prepared and attached a file that illustrates this.

I hope it answers your question

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Santiago Arnalich
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[Kent]

Yes this helps. So the demand itself is what causes the direction to change. I've been reading through the manual and am still unclear as to what base demand exactly is and how you find it.

[Santiago Arnalich]

Hi Kent,

To understand demand, you can read chapter 4 of the second book in this list called "Loading the model":

http://www.arnalich.com/en/books.html

You can browse all these books full text for free.