Removing areas from a rain-on-grid model

[Natalie Horsfield]

I plan to build a rain-on-grid model covering an area with existing mining pits and tailing dams to determine where water will flow outside of these areas. Is there a way to remove them from the model so that they don’t just fill up with water?

[Anonymous]

At the moment no, even with high mannings values the volume will always be lost. The only way would be to recondition the surface so it is flat with its surrounding areas and also give it a high mannings value. This takes a lot of work though and sometimes multiple iterations if its the first time doing it

[Lonnie A]

You could add a internal storage area connector around them and put a artificially high weir crest elevation. That would keep flow from entering.

[Anonymous]

Ive tried this in the past, for example i would try and build half circle or full rectangle SA con w artificially high weir crests but one the connector is enforced and converted from the original breakdown the software kind of breaks down and gives you a very odd shape.

For a full rain on mesh model your method will work if you have 2 separate meshes connected around a 1D SA with a volume table relative to the body of water, but this always gives odd results. This is something the software needs as rain on grid modeling will begin to take over the world

[Author]

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