Expand the catchment section in the visualisation tool

You will be redirected to the Settings. Once there, click "New catchment".

Define the type of catchment you want to add

You can define your catchment based on time or distance. Different travel modes will then be available.
- Car, Bike and Walk catchments can be either defined by a distance or travel time
- Transit catchments can only be defined by travel time
- Radius catchments can only be defined by distance

Define your catchment's parameters (speed, travel time, uphill or downhill penalty, number of transit changes, etc)

To see your new catchment, make sure it is selected in the visualisation tools, under the Catchment section