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I want the flow to start at the top of the map in the large canal (where there's a little wall on the edge of the map).
The water sources are not correctly placed, it's just the latest thing that I've tried to make it work.
(Also should mention that the map is set in the Netherlands, so it has to be this flat haha)
https://steamcommunity.com/sharedfiles/filedetails/?id=1749840057
There are issues here and I'll explain but first I need you to confirm some things.
Here's the situation and tell me if I have this correct,
https://steamcommunity.com/sharedfiles/filedetails/?id=1749867555
The main waterway running from right to left is supposed to be a canal? And this canal is flowing from right to left.
There are two rivers join that canal - a northern river and a southern river.
You want to know why the rivers aren't flowing?
Well, they are flowing...
https://steamcommunity.com/sharedfiles/filedetails/?id=1749868312
The southern river is clearly flowing away from the canal and off the map edge.
The northern river is also flowing for at least half of it's long length, and again, away from the canal and off of the map edge. However, the current is flowing in from the map edge for about a third of the river length from that end.
I've got this correctly assessed, yes?
Okay then, here are the issues and they deal more with your understanding of water and waterways, so I'll try to list them to help you see where you've gone wrong ;)
First, the canal:
1. Canals are not rivers. They do not flow.
If you want this to behave as a proper canal, you will need to seal off both ends.
2. Canals have no gradient.
You'll also have to level it so that it is flat for the whole of it's length.
Now, the rivers:
1. Ask yourself if those two rivers in real life feed the canal or are they fed by it?
If they feed the canal, then whatever flow they have should be flowing the opposite direction, beginning at the map edge and towards the canal, not away from it.
2. The water sources need to be at the river headsprings at the edge of the map (sealed edges) and the gradient of the riverbed should start higher there and gradually descend towards the canal.
Now back to the canal... if you want this to be an artificial man made canal in the traditional sense, then make the suggested corrections above.
If however, you want it to be a channel connecting to sea at either end, then you may seal both ends and you might require a mod to allow shipping to pass over the land seals. Or, you could leave both ends open, but then you'll need to use low capacity water spawners to maintain the water surface level. It might be a good idea to do so in any case, especially along the northern river length.
There's a lot of reworking to be done. I wish you success ;)
Please post the results of the rework when you're done.
But I should say a few things:
1. I don't really care about the realism concerning canals/rivers. I don't want to pollute the river, so I want a good current in the canal for sewage.
2. In real life it's just one river and one canal, they cross eachother (at the right on your screenshot).
I don't care if the so-called northern river (the short part) flows in another direction than the rest of the river, since it's outside of the 5x5 grid.
Also I haven't really focused on the river after I raised the entire map, I've just been focussing on getting the canal to flow first.
I figured if I had enough water pressure from the top of the canal, it would also flow into the river.
I will have a look at my map with your suggestions when I get home later today.
EDIT: I realise that I didn't really answer your questions ;) About the canal: I want it to look like a canal but behave like a river (if that makes sense). The river is just purely 'for the looks' and the canal will be used for transport and sewage and such.
That's also why i made the canal that wide, to make a ship route.
In real life the river flows from south to north (in your screenshot). The river and canal both begin way beyond the edge of the map so I guess they don't feed eachother.
1.The southern river needs to be sealed at the map edge and a water source. The riverbed from the source needs to gradually slope down until it meets the canal. This gradient (gravity) is what produces the flow in the correct direction.
2.The canal needs to be sealed at the source end and if you wish it to act as a river, then treat it as such, and again, give it a gradient from the source in the east to the open map edge in the west.
3. The northern river is a little more problematic. You want it being fed by the canal and you want the direction to flow north to the open map edge. However, you have not given it any gradient and in fact, in some places the riverbed is actually gaining in height and so the gradient is wrong. This is why the riverflow stalls and why the map edge is actually feeding it as a source.
In the map overhead screenshot above, notice the patch of trees I placed as a marker. Here's a close up.
https://steamcommunity.com/sharedfiles/filedetails/?id=1749870289
Up until this point the riverbed had been 19.36m, but from this point on it gradually increases.
You need to reverse this so that the riverbed is a continuation of the gradient from the southern river. It needs to gradually slope downhill and all of the way to the open northern map edge.
4. Both the north and south rivers are insanely deep, when in fact they should be no deeper than the riverbed of the 'canal' at the point that they intersect. Let that be your guide.
So the southern gradient should slope down until it is the same height as the 'canal' bed and the northern riverbed height should start at the height of the 'canal' bed at the intersection and then slope down towards the north map edge.
After you have made all of the changes, you should get a broad east/west flowing river (the 'canal') and a smaller south/north flowing river that intersects it.
For each of these rivers, and after you have corrected them, consider using some low capacity water spawners along their lengths purely to maintain the river surface level. You don't have to use many and keep the capacity very low, such as 0.1 or so. work gradually. Place these surface maintainers and wait for the effect to kick in, and then you can better judge where the next is needed.
That will improve the appearance of the rivers and keep the rivers flowing just below the river banks, rather than looking as if they are flowing through a ravine.
I wish you success ;)
So I understood why the northern river wasn't really flowing yet.
About gradually sloping the river: the way I did it with the canal is not the way to do it I guess? I think the flat parts maybe stretch out too long to really create a current.
What is the best way to gradually slope it down? Using the slope tool? I tried it once but found it very confusing so didn't bother to better understand it.
EDIT: I have used the slope tool on the canal now, but now I wonder what I should do with the sea level? Should I just keep it at 0 and let the water sources determine the water level or should I set the level at the bank of the river?
Yes, use the slope tool. If you create flat stretches of riverbed, you create steps and that's not what you want. You want a slight gradient for water to flow downhill, not a ladder ;)
On most maps, sea level is usually 40m by default, but that would make it 160m below the 200m height you have set the land to. That's way too deep. So, if you're not going to reduce the land level, then sea level should be raised until it is around 40m lower than the land at the western exit point of the river, making the river 40m deep at that point.
In other words, sea level should be 160m if the land is 200m.
I realise you're not looking for accuracy, but if this was the Netherlands, then the sea level would be 40m and the land would be 35m, since the Netherlands is around 5m below sea level ;)
Lol yeah 200m is a bit extreme, but I thought I didn't have enough height difference so I went for the safe option ;)
Haha yeah we live below sea level but this is not at the coast so I don't want to make ♥♥♥♥♥ and stuff ;) Altough it would be a cool thing to try out in the future :P
It descends about 130m in a gradual slope, but sadly there is no current, except for the bottom part where I placed 2 water sources. I have no clue why it is flowing in the last part.. when I place more water sources nothing happens.
https://steamcommunity.com/sharedfiles/filedetails/?id=1750382524
In the meantime I will start a city on a regular map, cause I don't what to do with my own map lol ;)
https://www.youtube.com/watch?v=D3O7gPOfazA
https://www.youtube.com/watch?v=fS3ayjUuhC4
At the end of the northern river I placed a high capacity water source as close to the bottom as possible which basically sucks the water all the way down the river!
I placed several very small water sources along the river to help raise the water level.
The current is not every as strong, but I think it'll be good enough.
This is the result:
https://steamcommunity.com/sharedfiles/filedetails/?id=1754909143