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Connecting a Lateral to a Main
Now, let’s extend the previous inspections so that it has some connection code in the inspection data at 25m (at 2 o’clock) and 32m (at 10 o’clock), and there are some gullies on each side of the central reserve plotted in the data, like this:
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This field allows us to enter the node ID of the point item that is upstream from the connection or junction, so in the first case of the junction at 2 o’clock it is most likely to be GY1000 and in the second case for the connection at 10 o’clock, it is likely to be GY2000.
From WinCan VX v14.0 this field is mandatory, so how might you handle a connection or junction that is capped off?
You must always consider connectivity, points and lines in DDMS modelling, so the solution is to create a phantom node with a stub lateral that has a nominal length of your choice (say 1m), because even though the connection or junction is capped off and is not being used, it is still there and could be used by a designer to connect a new gully to onto the existing network:
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In this field you can:
Select a point item that already exists in the data - you must type in the first two characters of the node before the list self-populates.
Enter the node ID of a new point item that currently does not exist in the data.
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The icon shows you that a lateral is tied in here and double clicking on this link will take you straight to that lateral in the other grid view, and there is also a button with an ‘up’ triangle arrow in the lateral grid view which will bring you back to the section that this lateral is linked to.
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Advice - although this technique does not really appear to make a great difference to the data and the drainage network design, it’s power is that because the laterals and the section are now tied together, when we introduce the GIS data at a future point and in that data, the 2 gullies and the 2 catchpits now have new coordinates in 3 dimensions (so far, everything has had no Z value here), the shape geometry of the sections and laterals will be modified and the coordinates of the connector nodes will be replotted, so everything will stay tied together when the new positions are introduced. If you do not make the lateral links, then the lateral pipes will become detached from the section when the new positions are brought in and it becomes very (unnecessarily) time consuming to re-attach them all. |
There are some additional techniques for joining objects together using the snapping tools in WinCan Map, but these are more usually used by data processing teams, and will be described in Snapping Objects in WinCan Map.
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