SewerCAD 1

[eimckay]

I am trying to simulate a closed valve to a treatment plant in sewerCAD to determine how long it will take until there is surcharge from the shallowest manhole in the model. I have run an EPS (Extended Period Simulation) but it did not work as I had intended it to. When I ran the cartoon of it in sewerCAD the sewage did not back up. I tried to create a closed valve situation by making the outfall junction (treatment plant) a user-defined tailwater elevation much above my HGL so the water would have no where to go therefore backing up into the pipe. The other area I am not sure about is the area of annotation. I assumed i wanted to annotate full pipe capacity but that did not work either. Does anyone have any suggestions?

 

[francesca]

I have some very bad memories of using SewerCAD.

Annotation should work, but you need to check your font size. Depending on the scale of your drawing/model, your font size may be too small to see.

As for your mechanical problems, is this a pressure-and-gravity model, or just gravity? If it's the former, then you need to go to the very last tab on the Run dialog and check "use pressure flows." I never worked on a model with gravity only, but if you should be able to assign an inflow hydrograph for your end points of your system through loads. You definitely want to explore importing loads from text files, too. My model had about 100 lift stations so I had to import my loads that way and it's actually relatively easy once you get the syntax worked out -- and there's an example in the manual. (Surprising, given that the rest of the manual is utterly useless.)

Finally, if you have a pressure/gravity interface or high points on your pressure lines that aren't at the very end, then you have to trick SewerCAD because it can't model an air relief valve. (And they don't have any plans on introducing that functionality.)