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Editing v0.34:Dam
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− | {{quality|Masterwork|00:23, 9 October 2010 (UTC) | + | {{quality|Masterwork|00:23, 9 October 2010 (UTC)}}{{av}} |
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[[Image:dam.jpg|right]] | [[Image:dam.jpg|right]] | ||
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Another way is to drain the river. This can be done by building a tunnel next to the river that dumps into a chasm or deep valley. The dumping tunnel should only be one square wide, with a single floodgate to control it, as long as where the water first enters it has a fairly large number of squares of "Open Space" to move into. The water over Open Space will rapidly force its way down, forcing the rest to flow at warp speed. Be sure the floodgate is operational, as this sort of flow imposes terrible game lag while active. The more edge tiles drained from, the faster the level will go down enough to allow construction. | Another way is to drain the river. This can be done by building a tunnel next to the river that dumps into a chasm or deep valley. The dumping tunnel should only be one square wide, with a single floodgate to control it, as long as where the water first enters it has a fairly large number of squares of "Open Space" to move into. The water over Open Space will rapidly force its way down, forcing the rest to flow at warp speed. Be sure the floodgate is operational, as this sort of flow imposes terrible game lag while active. The more edge tiles drained from, the faster the level will go down enough to allow construction. | ||
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An alternative method to this is to use a large number of pumps to move more water out of the river than can be replaced by the water flow. For a river with a width of 4 tiles, you will need <s> three on either side </s> four pumps spanning the river pumping it into channels or tunnels, ideally off the map, a waterfall, or somewhere where flooding will not be a concern. While the pumps are operating, it will be drained enough to build the dam. A little more mechanic intensive method is using nine pumps, four to pump where your floodgates will go, four to pump out places for your workers to stand up/downstream, and one to keep a ramp clear to retrieve the dwarves. This method has the advantage on not needing channels/tunnels saving that layer for future construction. | An alternative method to this is to use a large number of pumps to move more water out of the river than can be replaced by the water flow. For a river with a width of 4 tiles, you will need <s> three on either side </s> four pumps spanning the river pumping it into channels or tunnels, ideally off the map, a waterfall, or somewhere where flooding will not be a concern. While the pumps are operating, it will be drained enough to build the dam. A little more mechanic intensive method is using nine pumps, four to pump where your floodgates will go, four to pump out places for your workers to stand up/downstream, and one to keep a ramp clear to retrieve the dwarves. This method has the advantage on not needing channels/tunnels saving that layer for future construction. | ||
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If your dwarves are persistent enough you can also dig out a large chamber under the river at Z-1, channel out holes on both sides at Z0, and cover these holes with walled-in bridges. When you raise the bridges the water drops down; when you lower them it starts flowing again. This avoids the 'infinite hole' bug that can result if you use collapses to punch holes in the bottom of brooks. | If your dwarves are persistent enough you can also dig out a large chamber under the river at Z-1, channel out holes on both sides at Z0, and cover these holes with walled-in bridges. When you raise the bridges the water drops down; when you lower them it starts flowing again. This avoids the 'infinite hole' bug that can result if you use collapses to punch holes in the bottom of brooks. | ||
− | + | One other possible method of disposing of that water is channeling it to an [[aquifer]] lower than the river, it will absorb the pressurized water. The best part of this method is that the [[aquifer]] will likely be almost directly under the river, minimizing the needed construction. | |
− | + | You can also smooth and carve fortifications into the very last tile on a z level below surface (if that last tile is rock, and not soil) and water will flow through the fortifications and off the edge of the map. | |
[[Image:DammingEfforts.png|left|thumb|200px|An example of how to construct a magma dam.]] | [[Image:DammingEfforts.png|left|thumb|200px|An example of how to construct a magma dam.]] | ||
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===The Dam=== | ===The Dam=== | ||
[[Image:Dam2.JPG|left]] | [[Image:Dam2.JPG|left]] | ||
− | After your dam has been completed and looks something like the image, you can expect water to just stop flowing UNLESS there is a waterfall. If that is the case, the water will just flow around it after flooding a fair amount of space around it. If you messed up while making a magma dam and permanently obstructed the edge of the map, you can expect | + | After your dam has been completed and looks something like the image, you can expect water to just stop flowing UNLESS there is a waterfall. If that is the case, the water will just flow around it after flooding a fair amount of space around it. If you messed up while making a magma dam and permanently obstructed the edge of the map, you can expect the entire world to flood up to the point where water enters. |
===Actually Building=== | ===Actually Building=== | ||
− | Once the river has been drained (which can take a VERY long time), you may have to dig into the riverbed by ordering a channel to be dug in the open space tile above the tile you want to build on. The result of this, however, is that the tile is no longer considered a brook/river and it behaves like any other storage of water. It no longer colored a pretty light-blue and nothing (including dwarves, caravans, goblins, etc | + | Once the river has been drained (which can take a VERY long time), you may have to dig into the riverbed by ordering a channel to be dug in the open space tile above the tile you want to build on. The result of this, however, is that the tile is no longer considered a brook/river and it behaves like any other storage of water. It no longer colored a pretty light-blue and nothing (including dwarves, caravans, goblins, etc) can walk on top of it. This can be very annoying, so be prepared. |
However if your dwarves have access to the river bed they can 'mine' the bed out leaving the pretty blue surface (or dull grey surface when there is no water). you should leave some form of access to the <s>bed</s> channel at the farthest downstream point to let wanderers out of the bed if you decide to open your dam | However if your dwarves have access to the river bed they can 'mine' the bed out leaving the pretty blue surface (or dull grey surface when there is no water). you should leave some form of access to the <s>bed</s> channel at the farthest downstream point to let wanderers out of the bed if you decide to open your dam |