So, the full requirements for building a dam are:
1. One dam per flood basin.
2. Hex must be touching a river with 2 out of 6 sides. Of these two, one must be a floodplain.
3. Hex must have a teamed up hex that can also flood, counting from start of the floodplain set (from source downstream).
4. Any hex that can't team up with another hex (in case other hexes are alread teamed up), can't build a dam.
Found here. Maybe the teaming is the problem here?
1. One dam per flood basin.
2. Hex must be touching a river with 2 out of 6 sides. Of these two, one must be a floodplain.
3. Hex must have a teamed up hex that can also flood, counting from start of the floodplain set (from source downstream).
4. Any hex that can't team up with another hex (in case other hexes are alread teamed up), can't build a dam.
Found here. Maybe the teaming is the problem here?
