Tuesday, 29 November 2011

Using Parcel’s to calculate Open Channel Flow

A couple of years ago I developed a number of parcel styles and labels to calculate the capacity of basic open channels when you have limited data to do a full model.

Yesterday I had to use the styles again for the first time in a while and it took me a while to remember want to do, so I have made a quick screen capture of the process for future reference and others to review.

The label styles make use of expressions and user defined properties in the parcels. The process is not fully automatic but you can slide the parcel line representing the water level up and down to adjust the calculations and manually update the water surface length to get the correct wetted perimeter. Someone out there may have a clever idea on how this could be automated.

Also the Slide Direction tool does not seem to hold the bearing when moving from one segment of the road frontage (aka stream bed) to the next unless this is by design.

There is a link to the full screen movie here seeing the image below is a bit small.

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  1. Can you post a link to the screencast as it is too small to be legible........

  2. I have added a link to a full screen video onto the post.


  3. That's a lot better


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