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Editing v0.31:Dam
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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. | ||
− | 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 | + | 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. |
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 uses 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 uses collapses to punch holes in the bottom of brooks. |