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Thanks for the tip!

[Generate Watershed...]

Did you look at the File menu? That's where it is in the full version.
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Combine Terrain Layers...
Generate Contours...
Generate Watershed...
Rectify (Georeference) Imagery...
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The option is there and a dialog box comes up but when I click OK I get a message saying the utility isn't available until I register.

Hmm doesn't look like that watershed feature is available in the trial. And buying that right now is far above my budget for a whim of a hobby.

I've just discovered this site and it's got me thinking...

I'm taking a trip to Lake Powell in a few weeks.  Being that it's a reservoir, the lake level is almost constantly changing (for the past month a 1 foot increase per day).  Maps that i've seen are usually generated for a full pool lake level.

Would it be possible to generate maps based on a lake level you could specify at compile time? Or easily precompile maps based on a range of lake levels?

I currently have no experience in map making but I am a programmer. So, if this is possible it's something i'm interested in throwing some time at.   Any tips would be most appreciated.

Thanks.