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Build a watershed model

Pick a place on the map and a scale that fits your question — SWATGenX assembles the terrain, soils, land use, weather, channels, and (if you want it) the aquifer, into a model you can run and calibrate.

1
Pick a place
a gage, a basin, or hand-picked catchments
2
We build the model
national data, automated, minutes to hours
3
Run · calibrate · download
dashboard tracking, cloud calibration, full package

Which model fits your question?

Every option below is the same automated pipeline — they differ in where the boundary comes from and how fine the grid is. All of them are ordered the same way: open the map, click, confirm.

Most common
USGS station watershed
The full drainage upstream of a USGS gage — with observed streamflow attached, ready for calibration and validation.
When: Choose this when you want a gauged watershed: research, calibration studies, flow prediction.
Any basin
HUC8 / HUC12 basin model
A standard hydrologic-unit basin — no gage required. Click any HUC8 or HUC12 on the map and order it as-is.
When: Choose this for planning-scale work, ungauged basins, or when your area of interest is a named basin.
Fine resolution
HUC14 site model · 30 m
Drill inside a HUC12 and hand-pick individual catchments (with recursive upstream selection). Built at 30 m for site-scale detail.
When: Choose this for a facility, reach, or plume-scale question where 250 m is too coarse.
Groundwater
SWAT+MODFLOW 6 coupled
The watershed model plus a 3-D MODFLOW 6 aquifer beneath it — layers and conductivity kriged from state well logs, validated against well heads.
When: Choose this when groundwater matters: baseflow, water-table depth, aquifer interaction. Michigan Lower Peninsula.

Not sure? Start with a USGS station model — it comes with observed flow, so you can judge model quality immediately. You can always drill finer later; the pipeline is the same.

What arrives in the package

Ready-to-run SWAT+ package
TxtInOut with weather, soils (gSSURGO), land use, and NHDPlus HR channels — runs on the open engine, no GIS work.
Observed data attached
Streamflow at the outlet gage (station models); optional water-quality and PFAS observations per channel.
MODFLOW 6 model (coupled orders)
The full aquifer model with kriged hydrogeology, plus head calibration–validation against well records.
Cloud calibration on tap
Send any model to MMPSO cloud calibration from your dashboard — you get the calibrated parameters and the envelope.

Before you commit

Want to see finished models first? Browse the example models — real generated packages with maps, stats, and downloads — or read how the pipeline works and the SWAT+MODFLOW 6 technical page with its interactive 3-D aquifer.

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