Sebastiao Pereira implements the Ford-Fulkerson algorithm:
Graphs can be used to formulate mathematical models for many different applications and one particular type of problem to be solved deals with networks that transport some kind of resource from one endpoint to another, like water or electricity. Is it possible to create using only SQL Server features?
What’s neat about this is that this sort of flow algorithm also works for, say, complex ETL processes. Also, in case you were as curious as I was, that map is Dresden.