DFU to GPM
DFU to GPM
I am working on a project where I am trying to calculate gpm from each building(SFR, Condo, Restaurant, Hotel, Bar etc) and convert to cfs to size the sewer lateral for each building and sewer main lines on proposed onsite streets to finally calculate total sewer flow rate from the project to a proposed lift station. I have received DFUs for each building from the Architect. I am having hard time calculating gpm for each building from the given DFUs. When I look up the plumbing code, I see 1 DFU = 7.5 gpm and this seems very excessive. I have also seen 1 DFU = 1 gpm or 0.5 gpm in my online research.
I have seen the earlier posts, I have not gotten a simple answer for this. I am not concerned about internal plumbing lines, and their sizes but rather the sewer lateral that connects the buildings to main lines.
This project is big and my total DFU count is 5,275 and I would like to make sure I am calculating the numbers correctly so I don't oversize the sewer infrastructure.
I am used to applying a sewer generation factor for each land use an calculate the gpm/gpd/mgd/cfs for the project, but this is my first time dealing with calculating flow based on DFUs.
Any help here is appreciated. Thanks.