Must contain fields: huc12 or HUC12, tohuc or TOHUC
Requirements for HUC10 Analysis:
Upload HUC12 shapefile: For flow network analysis (12-digit codes)
Upload HUC10 shapefile: For boundary delineation (10-digit codes)
Both must be from the same region
HUC12 must contain: huc12, tohuc fields
System will derive HUC10 headwaters using "no incoming flow" logic
Step 3Select Shapefile Files
Uploading a ZIP file? Drag and drop it into the box below. The folder picker field to the left opens a folder browser and will not show ZIP files — use the "Select ZIP File" button instead if you'd rather browse for one.
Drop files, folders, or ZIP archives here
Supports: Shapefiles (.shp, .shx, .dbf, .prj), ZIP files, folders
Step 4Load & Process Files
This will load the shapefile and generate an initial map
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Processing...
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Click any watershed on the map (or search above) to highlight it: gold = selected, purple = upstream network, green = downstream network.
Headwater Analysis Results
Export Options
Exports shapefile with current state (original data, headwater analysis, or highlighted watersheds)