Hi Bentley System,
I am using WaterGEMs connect edition to model my water distribution network. I assigned consumer demands to nodes using Pressure Dependent Demand feature. Also I assigned emitter coefficients to nodes to represent the leakages of the network.
After simulating the model, is there a method to separate the total nodal demand in to Pressure Dependent consumer demand and emitter discharge? ( I want to split the total demand into leakage and consumer demand)
Thank you,
Harsha
Hello Harsha,
The emitter coefficient function is given as;
Q = k*(P^n)
where n = 0.5 (default value for an orifice)
P = pressure
k = emitter coefficient
The demand calculated by this is added to any base demands the junctions might have.
You can develop a formula based User Data Extension (UDX) to create a separate field (E.g. Leakage Flow) and add this to the junction table.
You can find out more about formula based UDX in the following article;
Creating Formula-Based User Data Extensions
However, are you modeling the PDD function for leakage? This is because the emitter coefficient is always pressure dependent, so no need to add a separate PDD function. This article can help you on this;
Applying PDD only to a portion of a node's demand, or to specific demand patterns
Here is another article which can help you;
Performing Leakage Detection Using Darwin Calibrator
Hope this helps.
Regards,
Yashodhan Joshi
Hi Joshi,
Thank you very much for your reply.
Yashodhan Joshi said:However, are you modeling the PDD function for leakage?
Just to clarify above, I have assigned PDD function to the domestic demands using Pressure Dependent Demand alternative. Because I thought the domestic demand is also pressure dependent, that people tend to use more water when there is high pressure in system and vise versa.
I set my calculation options to "New Steady State/EPS_PDD Solver - 1"
In addition I assigned emitter coefficient to nodes to represent leakages.
Hope this is ok. Please comment if you see any issue in this regard.
Kind regards,