culverts impacting watershed delineation

Discussion created by zack.benedetto on Jan 13, 2014
Latest reply on Jan 23, 2014 by zack.benedetto

I am delineating watersheds in an area of PA for a project. However, Some highways are recognized by ArcGIS as drainage divides because they are higher in elevation, but there are actually culverts going under these highways, allowing drainage to pass through, therefore removing or moving the drainage divides. I haven't been able to acquire the locations of the culverts, so I'm not sure how to resolve the shapes of the watersheds yet. Has anybody run into this sort of issue and knows methods that I can use to go about solving this?

See below, the main highway going diagonally across the picture creates the white drainage divides over it.

Zachary Benedetto
B.S. Civil Engineering '14
B.A. Geology '14
Lafayette College