As I know the Rating curve for the gully is usually can be got from the manufacture. can I generate the rating curve for "Curb Inlet on Grade" by using Bentley FlowMaster? if yes; how that can be done?
is the rating curve is the relation between the discharge flow and depth of water ponding over the grate? I was not able to find that relation in FlowMaster.
Regards,
Mohamad
Thank you Jesse - but I just wanna confirm your statements :
Jesse Dringoli said:"Gutter depth vs. captured flow" only applies to in-sag inlets and "flow to inlet vs. flow capture" only applies to on-grade. The reason is explained in my reply from Sunday.
Jesse Dringoli said:If you want to see the relationship between approach flow (flow approaching the inlet from the upstream side of the gutter) and gutter depth for an on-grade curb inlet, you could manually vary the Discharge input and observe the "depth" value on the right side (for example you could note the pairs in a table in Excel)
from what you said for the "On Grade" it can be generated the rating curve "Gutter depth vs captured flow" and can be used for the on-grade gully. if I miss understanding that; please let me know why that can not be used for on Grade?.
Mohamad Azzam said:from what you said for the "On Grade" it can be generated the rating curve "Gutter depth vs captured flow" and can be used for the on garde gully. if I miss understand that; please let me know why can not be used?.
For on-grade, you can generate a rating curve of approach flow (upstream gutter) versus gutter depth. However, as mentioned in a few earlier posts, with on-grade inlets, both the depth and the intercepted flow are calculated results (with on-grade), so you cannot solve for one, varying the other. This is why the "gutter depth vs. captured flow" rating curve is only applicable to in-sag inlets. See more explanations further up in the thread.
Jesse DringoliTechnical Support Manager, OpenFlowsBentley Communities Site AdministratorBentley Systems, Inc.
Hello Jesse,
As you explained previously; the both intercepted flow and depth are calculated in Flow Master and Bentley SWMM engine, what about generate a rating curve of approach flow (upstream gutter) versus gutter depth, and use that graph (rating curve) with the EPASWMM engine, in this case, can that curve be applied to "On Grade" since will be used with the EPASWMM engine (not Bentley SWMM)?
With on-grade inlets, only the approach flow vs. captured flow rating curve can be used. Having the ability to enter an approach flow vs. gutter depth curve would not be enough information for on-grade inlets since they need to know how much flow gets captured vs. bypassed. Perhaps the ability to use HEC-22 catalog inlets with the "Bentley Enhanced" SWMM solver is a major benefit you could point out, toward using that solver (rather than the EPA version of the solver)
Answer Verified By: Mohamad Azzam