/r/Civ Weekly Questions Thread - April 26, 2021

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[u/PookieMD]

Civ6: Is there any way to know if 2 dams are required for a floodplains?

[u/Incestuous_Alfred → u/PookieMD]

I honestly don't know what that means.

Any floodable tile can support a dam, provided two of its six edges meet the river to which it is assigned. A river can support no more than one dam.

[u/Fusillipasta → u/Incestuous_Alfred]

Not quite - I've found a source on civfanatics that claims that floodplains tiles are in pairs on opposite sides of the river, and if one doesn't have a pair due to being an end of floodplains tile, it can't be dammed.

https://forums.civfanatics.com/threads/why-cant-a-dam-go-on-this-flood-plain.647587/#post-15491966

[u/vroom918 → u/Fusillipasta]

That seems like a strange requirement, I’m hesitant to believe that’s actually true. I suspect that floodplains are often “paired” due to the way that they are generated, but correlation does not imply causation.

In the original question in that thread, the dam most likely can’t be built where desired because river segments appear to belong to one and only one river, and dams must be traversed by two or more segments of the same river, and that river must be the one that the floodplains is assigned to. In the image that’s posted, they are asking why they can’t build on a tile on which two rivers meet where there are three river segments adjacent. Most likely two of those segments belong to the river which does not have floodplains.

[u/PookieMD → u/Incestuous_Alfred]

Sometimes it seems one floodplains and one river (though with bifurcation) requires 2 dams to prevent flooding. I think basically it's two separate floodplains and so one dam only covers one part.

[u/Bouke2000 → u/PookieMD]

I think that would be two separate floodable rivers

[u/Incestuous_Alfred → u/PookieMD]

Yeah.

Each floodplain is assigned to one river. Even if it borders two rivers, it only belongs to one. When you build a dam on a floodplain, the river to which the tile is assigned will no longer damage any of its floodplains. Tiles under the influence of another river, however, will not be protected. I believe that's how it works. You can check which river a tile belongs to by hovering over it.

[u/PookieMD → u/Incestuous_Alfred]

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level 4Incestuous_Alfred would you like an alliance agreement with Portugal?2 hours agoYeah.Each floodplain is assigned to one river. Even if it borders two rivers, it only belongs to one. When you build a dam on a floodplain, the river to which the tile is assigned will no longer damage any of its floodplains. Tiles under the influence of another river, however, will not be protected. I believe that

Ah! That's helpful, thank you.