How to best model outlet structure...
How to best model outlet structure...
(OP)
I have a pond with an outlet structure as shown in this link.. [IMG]htt p://i2.pho tobucket.c om/albums/ y3/itchyna ckers/outl etjunk.jpg[/IMG]
I've been able to model it as shown here... [IMG]http ://i2.phot obucket.co m/albums/y 3/itchynac kers/outle tjunk2.jpg[/IMG]
but my model assumes the weir has vertical sides, when in fact it is sloped. I've also tried to model it as a horizontal orifice. Is there a more accurate way that I'm not thinking of?
Thanks, Adam
I've been able to model it as shown here... [IMG]http
but my model assumes the weir has vertical sides, when in fact it is sloped. I've also tried to model it as a horizontal orifice. Is there a more accurate way that I'm not thinking of?
Thanks, Adam





RE: How to best model outlet structure...
This will overestimate the flow in the corners to some extent, so you may want to reduce the discharge multiplier to allow for this. But the culvert will start to control before you get too much head, so any error will be limited.
If in doubt, do a simple sensitivity analysis: Reduce the discharge multipler and see how much difference it makes to your peak storage and discharge.
RE: How to best model outlet structure...
Of course, as Peter mentions, you whould probably use a trapezoidal weir from your discription (which does not have crest height input).
RE: How to best model outlet structure...
Also, I did a sensitivity analysis on the structure. Minor variances with different properties.
Thanks everyone.