Wednesday, 16 June 2021
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Lately, I'm seeing projects where the irrigation POC is downstream of a large back flow device, usually a building-wide RPBA. The irrigation system is further isolated from there, usually with a DCVA. The CA, after sizing the main line, only accounts for the first BF after the meter. I know I can add the second manually to the CA, but is there any way to make it account for both? I have to delete the first to see what loss is through the second one and then do the math. Or is there a work-around?

Thanks!
Aha! I discovered that the CA does account for the second BF--as part of the main line losses. So, no need to do math!
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