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overflow grate

overflow grate

overflow grate

I am modelling a pond (pre-existing) and was wondering about the best way to model my outlet device.  Like many structures I see, this one has a concrete riser with a couple of small holes drilled in the sides and big hole on top which has been fitted with a grate, much like you would see on a catch basin.

Should I model the grate as one big orifice or rows and collumns of small holes?  How much difference will it make?  As I mentioned, I am more evaluating an existing system, so sometimes the information I get is somewhat limited.

Thank you!

RE: overflow grate

For general information on modeling a riser structure please see the example at www.hydrocad.net/pond1.htm

For the top of the riser, I suggest you compare the two scenarios to see how much they differ.  For most spillways (including the top of a riser), a fairly large change in the discharge coefficient will have a relatively minor effect on the peak elevation and disccharge.  But you should test this to be sure.

Useful tips:  You can disable an existing outlet without deleting it by setting the discharge multiplier to zero.  Or you can use Control-Drag to make a copy of the entire node for testing.

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