Watershed Tool Instructions Figure 2. Watershed delineation
![Snapshot showing the steps for watershed delineation in the NHD Watershed Tool](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/full_width/public/thumbnails/image/figure_2_0.jpg?itok=uigHRN_v)
Detailed Description
Figure 2. From left to right and top to bottom: Box 1. Select the point of interest; Box 2. Up-stream navigation is performed on the centerline network and the program calls drainage catchments that have a 1:1 relation to the NHD reaches; Box 3. The catchment where the selected point of interest falls in is split in two and the sub area upstream is isolated from the remaining area; Box 4. The sub-catchment is combined with all up-stream catchments and internal boundaries are dissolved.
Sources/Usage
Public Domain.