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Furthermore, when we use the option to display just the direction text in the inspection direction field (i.e. Upstream or Downstream), then what we are actually saying is ‘with the flow’ or ‘against the flow’, so again, this can only be defined if the flow direction is defined.
Conclusion Part 1
What all this means is that if we attempt to switch the flow direction of the pipe in the data, then what actually must happen on this action is the flow direction stays the same, but the upstream and downstream manholes swap places, the direction of all the inspections connected to the pipe are reversed, and there are no changes to observation positions.
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For a downstream inspection:
Flow direction is A – B (notice that there is no arrow and we simply show the manhole that is defined in the upstream field on the left and the manhole that is defined in the downstream field on the right)
Start and end manholes are A → B (i.e. starts at A and ends at B)
Inspection direction is A – B (there is no arrow because the inspection direction cannot be defined without the flow direction being defined or vica versa)
For an upstream inspection:
Flow direction is A – B (as above)
Start and end manholes are B → A (as above)
Inspection direction is B – A (as above)
Conclusion Part 2
If the either the flow direction or the inspection direction are unknown or not defined, then it is not possible to show an arrow in the pipe graph or the printing reports because the inspection direction and flow direction are mutually exclusive.
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