Rainfall¶

Rainfall inflows apply a spatially uniform rainfall intensity over a polygon within the domain.

Properties¶

Property	Type	Description
`type`	string	Must be `"Rainfall"`
`data`	string or array	Intensity in mm/hr (constant or time-varying)

Constant rainfall¶

Set data to a single numeric value (as a string):

"data": "50.0"

This applies 50 mm/hr for the entire simulation duration.

Time-varying rainfall¶

Set data to a JSON array of timestamp/value pairs:

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

ANUGA interpolates linearly between data points using forward-fill for missing timesteps.

How it works¶

Internally, rainfall polygons are applied as Polygonal_rate_operator instances with a conversion factor of 1.0 x 10^-6 (converting mm/hr to m/s, the units ANUGA uses internally).