Define Rainfall¶

Rainfall is the most common inflow type. It applies a rainfall intensity (in mm/hr) uniformly over a polygon within your domain.

Adding rainfall¶

Select the Inflows layer
Click the pencil icon to enter edit mode
Click Add New Feature
Draw a polygon covering the area where rainfall should be applied
Set the Type to Rainfall
Enter the rainfall intensity in the Data field (e.g. 50 for 50 mm/hr)
Click Save Changes

Tip

For a simple uniform rainfall event, draw a single polygon that covers the entire domain boundary. The rainfall intensity will be applied uniformly within the polygon.

Time-varying rainfall¶

For time-varying rainfall, the Data field accepts a JSON array of timestamp/value pairs:

[
    {"timestamp": "2024-01-01T00:00:00Z", "value": 0},
    {"timestamp": "2024-01-01T00:10:00Z", "value": 25},
    {"timestamp": "2024-01-01T00:30:00Z", "value": 50},
    {"timestamp": "2024-01-01T01:00:00Z", "value": 10},
    {"timestamp": "2024-01-01T01:30:00Z", "value": 0}
]

Values are in mm/hr. ANUGA interpolates linearly between data points.

Next steps¶

With elevation, boundaries, and rainfall defined, you're ready to configure and run a scenario.