HEC-HMS Modeling Help--Rectangular Weirs

[wwggaa]

Hi all,

I am trying to model a weir outlet structure in HMS similar to the picture attached. HMS doesn't have an option to specify the weir configuration and I am unsure how to input the design so that the program analyzes it correctly. Would it just be three orifice outlets stack on top of each other?

 

[froude]

One option may be to specify a "Dam Top" for your reservoir with a Non-Level Overflow method. You can then specify a cross-sectional geometry of your structure. Another option would be to develop an elevation-discharge rating curve for your structure and use that as your outfall structure. I have found that to actually be easier than messing with the physical outfall structures.

Good luck!