USGS StreamStats has a nice watershed delineation tool I use. I picked the outlet point at the top there where I drew the red arrow. It delineated this watershed in about 9 seconds. One pick... no tedious waterdrops required.
I would like Autodesk to put an inquiry to the USGS about this technology for use in Civil 3D terrain models.
It's the little black dot button. This is a great tool. We have have it in NJ for a couple of years now.
John Mayo
Hey John, Happy new year.
Stream stats a tool to get?
I have always understood watersheds to be nebulous so what about catchments?
Joe Bouza
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Happy New Year Joe!
Stream Stats is free. It is available in NY. Other users can check here to see if it's available.
http://streamstats.usgs.gov/ssonline.html
It's very nice. Just as Fred said. Click a point and the watershed is delineated. Peak flows for a range of storm events can also be computed for you.
John Mayo
StreamStats computes basins using preprocessed DEM data and streamlines. Those two computations are a bit computationally intensive.
Catchments operate on TINs, and the calculations are quite a bit different than the ArcHyro D8 calculations that StreamStats uses.
Great site Fred, thanks for sharing.
I just generated a watershed boundary & imported into C3D in about 5 minutes.
Looking forward to this saving me the tedious task of tracing a watershed boundary by hand.
Thanks for the additional info Matt. The thing we like most about Stream Stats is the DEP has been accepting the data. No more methodology games. 🙂
John Mayo