The data needed and the formula for the field calculator can be downloaded here:
[ Ссылка ]
I use land use and DTM because we wanted a simple flood risk map, you can change it depending on the complexity. The scoring is also very simple, you can use your own score. What I show is only an example. You can use it on both QGIS and any other GIS software with some change.
![](https://s2.save4k.ru/pic/iQQvcDlhh3U/maxresdefault.jpg)