Select a basin and run the analysis.

Add outlet points or analysis areas, choose rainfall and runoff inputs, then run. The app checks basin completeness before results are shown.

Analysis selectionsOutlets or selected area relationship

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Paste coordinates Latitude, longitude — one point per line

No outlet points added.

Import project boundary or corridorGeoJSON, KML/KMZ, GeoPackage, or zipped/complete Shapefile

Polyline corridor buffer (m)Applied only when the uploaded layer is a polyline.

No GIS selection imported.

Area relationshipOutlet-point delineation remains unchanged. This setting applies only to drawn polygons. Minimum analyzed watershed area Watersheds smaller than this value are omitted. Use 0 to analyze every delineated watershed.

No analysis areas added.

Add at least one point or area.

Terrain and basin setupElevation source and delineation method

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Project region DEM source Terrain providerALOS PALSAR RTC 12.5 m is radar imagery, not a DEM, and is not listed as terrain. DEM GeoTIFF Processing AOI Initial terrain coverage

Manual minimum AOIUse this when a very large basin needs a larger starting terrain request. It must contain all selected points and areas.

Automatic terrain coverage is active.

Optional validation / burn-in

Delineation engineRecommendedRegional routing closes very large basins; fine terrain supplies detailed basin statistics. Independent validationTDX is optional and never supplies the published basin polygon.

Stream burn-in

Burn depth (m)Burn width (m)

Use the Map workspace toolbar to draw or import the polyline that should be hydro-enforced.

Recommended setupUse public Copernicus terrain and the recommended delineation engine unless the project has a reviewed DEM or stream alignment.

Design rainfallIDF source and return periods

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Design rainfall data Oman rainfall zone Project IDF CSVColumns: zone, duration_min and rp<years>_intensity_mm_hr.

Return periodsEach selected period is available in the interactive rainfall and hydrograph views.

Runoff parametersManual or public land-cover maps

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Coefficient source

Runoff coefficient CSCS Curve Number

Hydrologic Soil GroupWorldCover classes are converted to basin-weighted preliminary C and CN values using this soil group. Adopted time of concentration

Initial abstraction ratioStorm duration (h)

HyetographTime step (min)0 = automatic

Regression region

Hydrograph routingOptional confluence accumulation for selected outlets

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Multi-outlet hydrograph treatment RoaDRain infers downstream links from the D8 terrain network, separates incremental local runoff to prevent double-counting, and applies the selected method to all retained outlet points.

Channel velocity (m/s)Used to estimate Muskingum travel time. Muskingum XScreening storage weighting; calibrated data should replace it for final design.

Adopt the routed/accumulated peak as the recommended design flowWhen cleared, routed results are reported as an additional comparison and the existing Rational/SCS selection remains unchanged.

Network-aware accumulationIf a selected downstream point lies below the junction of upstream channels, its routed hydrograph includes the upstream responses plus only the incremental runoff between those points.

Project detailsSaved project and report title block

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Project nameLocationClient

Hydrologic selection mapOnly selections and analysis-relevant drainage layers are displayed

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