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Emitter Coefficient - K

Hi all

I have a question related to unit of K (emitter coefficient). The formula is Q = KP^x then Q (l/s) and P (mH20) so I think K will have unit . Is it right ? If yes, should I exchange unit of Q to m3/h or still keep l/s because I wanna unify their unit. Is it Ok ?

Thanks.

Offline Jesse Dringoli Thu, Dec 15 2011 2:55 PM
Hello,

Yes, the emitter coefficient has units. Here's a snipit from the WaterGEMS/WaterCAD documentation (this is also in our Advanced Water Distribution Modeling and Management book):

Also, here are the available units in WaterGEMS/WaterCAD for the emitter coefficient:

So, if the pressure is in meters and the emitter coefficient is in L/s/(m H2O)^n, then the flow unit would be L/s

Here's a table from the Help for common hydrant emitter coefficients in different units:

Regards,

Jesse Dringoli
Technical Support Manager, OpenFlows
Bentley Communities Site Administrator
Bentley Systems, Inc.
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tramnguyen Thu, Dec 15 2011 4:16 PM

Hi Jesse

Thanks so much for your detail answer. I can move forward my job now.

Thanks again
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Offline Jesse Dringoli Wed, Nov 21 2018 2:28 PM in reply to Jesse Dringoli
Please note that a subsequent reply to this thread has been split off into a new thread here: Method to estimate emitter coefficient

Regards,

Jesse Dringoli
Technical Support Manager, OpenFlows
Bentley Communities Site Administrator
Bentley Systems, Inc.
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