FCV for Modelling Existing System

Question

Hi. 
 I have a basic question w.r.t to modelling. 
 
 I am having a DMA with 2 inlets. 
 
 How do I model the flows through these inlets? 
 
 I am trying using FCV at D/s of Both the reservoirs and giving them the known volume/day value. 
 
 Is this a correct practice? 
 
 If I try to model without FCVs, then only single inlet will supply the entire flow, which isn't correct. 
 
 Please suggest the correct method to model multiple inlets for a DMA. 
 
 Thanks.

Tom Walski · Answer

What exactly are you trying to accomplish with this model? 
 If you have a model of the entire system and the DMA is a small part of it, then you don't need to do anything special. The model will calculate the flow into the DMA and pressures in the DMA. 
 If it is fed through some kind of control valves (e.g. PRV), you need to model that valve correctly. I doubt that an FCV would be the correct model element. Only use an FCV if you have a valve that behaves like the FCV element. See blog post on this topic below. 
 blog.virtuosity.com/death-to-flow-control-valves 
 Using a Flow Control Valve (FCV)

Yashodhan Joshi · Answer

Hello Chetan, 
 Ideally a DMA should have a single point of source / connection which can be monitored / metered. However, in your case if there are multiple legitimate connections using an FCV for one of them should suffice (for flow control). The balance flow should be consumed from the other reservoir. 
 However, it is difficult to keep track of water in such cases as multiple inlets can cause bigger problems if the system has existing leakages and ultimately increase NRW.

FCV for Modelling Existing System

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