I work for a local authority and I'm measuring the surface area of river catchments inside our local authority.
I have a polygon layer showing me the catchments but a few of them go over our boundary into other local authorities - so just measuring the polygon's surface area would be no good.
Is there any way I can measure how much of the polygons 'sit' inside our boundary (which I also have as a separate layer)? I'm using QGIS 3.