RoaDRainHydrology workspace
v3.5.2 Beta
Editing an existing projectSaved inputs are reused unless you select replacement files. The previous result remains unchanged.
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Project files

Open a previously saved RoaDRain project file and continue your work from the last saved state.

1

Load, draw or edit the road alignment

Upload an existing centerline, draw a new alignment directly on the map, or edit the loaded geometry before defining the project AOI.

Waiting for alignment
Choose a road alignment file to begin.
File—
Length—
Geometry—
Source CRS—
Why this comes first

The road extent guides the map view and helps you draw an AOI that contains the complete alignment while extending far enough upstream for watershed delineation.

Project map Upload or draw the road alignment to activate AOI drawing.
Road AOI
Click Measure, then draw a line.
1A

Confirm chainage direction and map stationing

Select which alignment endpoint is Ch. 0+000. RoaDRain uses this direction for all crossing chainages and can display station labels on the maps.

Select Endpoint A or Endpoint B as the start of the route.
2

Define the processing area

Use automatic coverage, or draw a larger minimum AOI when a very large upstream basin needs more starting coverage.

AOI tools are locked until the road alignment is loaded.
A manual AOI must contain the whole road. It enlarges the starting terrain request and never clips automatic edge expansion.
3

Configure project inputs and screening criteria

Select terrain, runoff coefficients and hydrology settings for tender-stage crossing screening.

English interface · Metric units
Project information
Report metadata: these fields are used in the generated screening report. If the location is left blank, the report uses the alignment centroid coordinates.
Terrain and runoff coefficients

Digital elevation model

Availability is deployment-specific. ALOS PALSAR RTC 12.5 m is radar imagery—not a DEM—and is therefore not misrepresented as a terrain source.

Runoff coefficients

Weighted C and CN are calculated separately for every delineated catchment.

Basin delineation

Choose the terrain workflow

The recommended option automatically finds complete terrain coverage and calculates catchments from the selected DEM.

Optional validation / burn-in

Keep Automatic unless a reviewed stream line must guide drainage through difficult terrain.

Rainfall, hydrology and design criteriaConfigure the screening basis in three guided steps
IDF zoneLoading…
Road classNational / Arterial
Design eventAutomatic
UnitsMetric
1

Project region and hydrologic method set

Use the global workflow for all locations unless the project is in Oman and Oman-specific rainfall and regional comparison methods are required.

Global modeRational Method and SCS-CN dimensionless unit-hydrograph calculations only.
2

Rainfall basis and IDF zone

Select the rainfall-frequency source appropriate to the project location and confirm the dataset used by the analysis.

Loading IDF zones…
Preview selected-zone rainfall intensities
Rainfall intensity in mm/h for the return periods used by RoaDRain.
3

Road and structure design criteria

Define the crossing extraction threshold, design event and preliminary structure assumptions.

4

SCS design-storm configuration

Set the rainfall temporal distribution used for the SCS hydrograph calculations.

Calculation basisRational and SCS-CN/unit-hydrograph estimates are calculated for every project. Oman-specific regional comparisons are added only when Oman mode is selected. Indicative culvert dimensions remain screening outputs and require detailed inlet/outlet-control, headwater, tailwater, debris, scour and constructability checks.
Waiting to start0%
Stage QueuedElapsed 00:00Scope —
Inputs
Terrain
Network
Catchments
Hydrology
Outputs