Interactive mode

[Joe-Bouza]

During interactive mode I would work my way upstream check/ making adjustments to pipe sizes; I set my min pipe to 18" for trunk but our local agency allows 15" at catch basin to trunk. So when I make that adjustment I also tried to lower the down stream inverts of the catch basin line to the trunk to increase velocity and the velocity actually goes down when I lower the invert? This seems wrong to me and I'm sure its user error. Do I have to lower all the down stream inverts? I thought the program would do that if I had to adjust the upstream.

And more importantly: If I set my codes to min velocity 2.5 fps and min slope 0.2% why did the design analysis run and give me those upstream pipes at min slope and violate min velocity? I must be missing a step.

[Joe-Bouza]

hmm? Beuler? <G>

[Matt.Anderson]

Joe -

That's a bunch of questions.  Velocity will go down if you are up against the HGL of the downstream connecting pipe, esp if you are asking if you need to lower the downstream pipes.   Yes, the up/down edit is only dealing with the pipe section that you are currently editing.

I would move downstream making corrections and edits to get the system to work.  

Matt Anderson

[Joe-Bouza]

Thanks Matt. Yeah I guess that was a mouthful. I also afterwards recognized my conceptual layout could elliminate a catch basin here and there; the trib and Q are so small the next down streeam basin should be able to handle it.