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Project Generation Problem

Question asked by geonetadmin on Mar 19, 2014
Latest reply on Mar 19, 2014 by MBoucher21
Original User: USAFAORCapstone

I�??m working towards the creation of a HEC-HMS model for a watershed coming off the Waldo Canyon Burn Scar in Colorado Springs, CO.

We�??ve gone through all of terrain pre-processing but have hit a road block in specifying an outlet point for the project before generating the project. When selecting an outlet point far enough upstream, the contributing area is correctly highlighted but HEC-GeoHMS does not appropriately select the entirety of the upstream area past a certain stream junction (see attached images).

I�??ve read that the issue may be the user-defined threshold was set too high during the stream definition step during pre-processing. Alternatively would it be easiest (or even possible) to use Basin merge to combine the highlighted area?

Please forgive my relative ignorance �?? I�??m an undergraduate Operations Research major with no hydrology of GIS experience.