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Test mode This server does not run the full modelling workflow, so results are for testing only:
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    Local basin preprocessing workspace
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    Limited compute. Local calibration is recommended.
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    1 Parameters
    2 Boundary
    3 Submit

    Outlet map Click a river location on the map, or edit longitude and latitude above.

    Zoom to the river before adding points. R markers must drain to the outlet; X markers must not. Coordinates below update automatically.

    Place the outlet on a river line. For a small glacier catchment, check the boundary preview; if it is wrong, use the target-glacier option in Advanced options or upload your own boundary.

    Default Data Sources

    Select precipitation, temperature and land-use products here.

    Soil hydraulic data
    Glacier outlines
    Debris-covered glacier
    Glacier ice thickness

    Calibration inputs Upload a CSV runoff file. The page will detect available years when possible.

    Run automatic calibration on

    Runoff years Upload CSV to auto-detect the available range.
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    2000-2010
    Winter runoff calibration period (WR)
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    Set independently when winter flows are affected by human activities.
    Snow years MODIS available range: 2001-2025.
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    Glacier GMB years Hugonnet range: 2000-2020; often 5-year values.
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    Quick guide

    A short Hydro2go tutorial loaded from Markdown.

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    My jobs

    Review status, confirm boundaries, and download results.

    Admin review

    Signed-in administrator account can approve, terminate, and clean job records.

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    User storage and active jobs
    Maintenance mode

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    Server workers

    How many tasks the website server runs at the same time. Raise only if the server has enough memory.

    Design Tuning

    Please wait

    Hydro2go is delineating the basin according to the selected model resolution. This usually takes no more than 3 minutes.

    Higher model resolution usually takes longer.

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    Check boundary

    Grid cells -
    Area
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    Resolution
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    Outlet
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    Does this boundary look correct?

    Check the intended river, main glacier contribution area and neighboring basins. Small ridge or grid-edge differences are acceptable. If the main extent is wrong, edit the outlet or upload your boundary.

    Download SHP

    Advanced options

    Optional. The defaults suit most basins.

    Used when the outlet drains a small glaciated headwater. Both MERIT and the SRTM DEM are 3″ data and can miss sub-km² glacier catchments; if the preview is wrong, upload your own boundary in the review step.

    Boundary: glacier and upstream river constraints

    Enter points on known upstream river channels, one longitude, latitude pair per line. Required points must drain to the selected outlet; excluded points must not. The outlet coordinates become a search anchor. To retain both a main river and a tributary, add an upstream point on each. Constraints do not independently validate the boundary.

    Uses the configured DEM and delineation grid. Model builds currently require the same grid. Unsatisfied constraints stop delineation.

    Find the nearest ice-free outlet draining the requested fraction of a target glacier within the search radius. Coordinates become a search anchor. Some glaciers drain through multiple outlets; unsatisfied constraints stop delineation.

    Uses the configured DEM and delineation grid. Model builds currently require the same grid. Unsatisfied constraints stop delineation.

    Initial values are used by every model run; the range and the Calibrate switch apply to automatic calibration (PEST units). Forcing corrections (PCF, GPCF, PG, TEM, TLAPSE) take their initial value from the forcing data.

    Parameter Unit Calibrate Initial Lower Upper

    Job details

    Preprocessing warnings

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    Error summary

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    Preprocess log

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    HPC log

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    Boundary log

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