Comment by AngelOnFira

We don't have a great way to find the blog posts that do talk about these topics outside of searching, but here are some references:

Erosion - https://veloren.net/devblog-43/ Erosion + rivers - https://veloren.net/devblog-36/ Towns - https://veloren.net/devblog-31/

There are lots of other blog posts that discuss these topics, I should really aggregate some of these sections in the future. Those links go into the most detail I think, future stuff is more about tweaks than the core systems (we've been putting out a blog post each week for 160+ weeks now!)