Reality Check please

[Joe-Bouza]

Hi, I have attached my stm file and hope someone could check me on this. I took this existing system and entered known flows where given and did not bother with areas or Tc, then ran analysis without changing inverts or pipes to see the HGL ends up. Well the  HGL is 90 ft above grade! The flooding is bad but not that bad. Can I do what I'm doing or am I confusing the software? Thanks

You'll have to change the extension to stm - the board would not let me post as stm? Weird

[AllenJessup]

Joe,

I can't check the file right now. But what you describe sounds familiar. We had similar results when entering limited data for an existing storm system. We checked the calculations by hand and came up with similar results. It looks like it takes the the water and raises the TGL as if the pipes had no top. So It's not saying that the water would be 90' AGL

Although the results were not realistic. We could still see the effect of theoretical changes. So the model was still useful.

I hope you find this helpful.

Allen

[Joe-Bouza]

Hi Allen, Yes I do find it helpful.

[Matt.Anderson]

Joe, without looking at the model, it is entirely possible to calculate extremely high HGL based in the pipe friction, entrance or orifice control. I you walk the network, you can see the calculated capacity, and the capacity you are attempting to push into it.

If you need to simulate or calculate surface flow, check into SSA.

[Joe-Bouza]

Thanks Matt, I agree and you and Allen re-affirm my assesment. I needed that to take the results to my super.

SSA is a seperate down load for 2011?