PondPack - oriface question
PondPack - oriface question
(OP)
Working in the PondPack outlet structure editor, I want to create a rectangular oriface, for which you select "Area" for your oriface type. However, there seems to be no way to specify the height and width of the oriface, only the area. Two rectangular orifaces with the same area but different H:W ratios could have very different outflow characteristics. Is there a way to specify the dimensions that I am not aware of? Is there a default H:W ratio that PondPack uses in its analysis? Any help would be appreciated.





RE: PondPack - oriface question
RE: PondPack - oriface question
RE: PondPack - oriface question
RE: PondPack - oriface question
RE: PondPack - oriface question
I'm not sure about Pond Pack, but the software really should handle these cases automatically, including the ability to specify the actual dimmensions of the opening. Some programs (such as HydroCAD) will even let you model a custom orifice/weir opening of any shape.
RE: PondPack - oriface question
RE: PondPack - oriface question
But this is for a riser type structure with the opening in the horizontal plane. I imagine you are looking to put the rectangular orifice in the vertical plane. This might be the best way to trick the software by just inputing the bottom width of the slot for weir length (but it not designed to work that way and you would want to pay close attention to the orifice/wier calculations output and probably do a hand check to see if it was behaving properly).
Unless you have a lot of time on your hands you are probably better off forming your own rating curve as mentioned above.
RE: PondPack - oriface question
You are going to enter an orifice and a weir structure into the outlet structure system. For each one you are going to click the "Options" button at the bottom of the screen..
For the weir: you are going to have it on as a weir from the bottom elevation of the weir to the bottom elevation of the weir plus 1.2 times the height of the orifice. (I really am unsure about the 1.2 times, I would think it would just be at the top of the orifice but for some reason this is sticking in my head and I don’t have the manual to confirm it but perhaps someone else knows).
For the orifice: you are going to have it on as an orifice from the bottom elevation of the weir plus 1.2 times the height of the orifice (the same number you stopped the weir equation at) and then to the top of the structure.
Hope this all made sense. I hesitated responding because I am unsure but maybe this will point you in the right direction.
-KD in CT
RE: PondPack - oriface question
I think this method is somewhat similar to what KD is describing above.