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[blue sam3]

Use a diagonal filter:

Code: [Select]

#######
#~~~~##
~~#~#~~
~~~#~~~
#~#~~~#
##~~~##
#######

(#: something solid, ~: empty space for water)

Build this at the level at which you want the water to stop rising. The diagonals cancel the pressure out, whilst the extra width maintains flow levels. You might want to make the "something solids" lever-linked doors or something like that, then set it up so that the water will rise up into your entrance corridor (with some appropriate drainage system), just in case it's useful.

[Aseaheru]

you can have diagonals to reduce the pressure.
like so.
+ is floor
= is walls

===
=++
+==

results in minimal pressure. but you should still have a floodgate of somesort.
and possably a pump to clean the water.

[Sutremaine]

The fortification will keep building destroyers from reaching the floodgate

That won't (as mentioned), but building a grate or floor bars can. Build them so that invading creatures can only reach them from underneath. Building destroyers can't destroy stuff on different levels if they can't get to it normally, much like fliers can't fly directly somewhere unless they could also walk there.

Also, don't just smooth the floors of your waterways, or you will eventually get trees growing on them - be sure to use constructed floors to prevent that.

I prefer carving up-stairs. Yes, the flashing is annoying, but treeproofing your plumbing as you dig it is worth it.

[Aviator CJ]

The fortification will keep building destroyers from reaching the floodgate

That won't (as mentioned), but building a grate or floor bars can. Build them so that invading creatures can only reach them from underneath. Building destroyers can't destroy stuff on different levels if they can't get to it normally, much like fliers can't fly directly somewhere unless they could also walk there.

If you do this, be sure to remove ramps or stairs from underneath, or building destroyers can break through.

[Gentlefish]

U-bends are your friends. Put a floor grate on the top of the inner part and nothing can get in.

[McMagma]

Im getting water from a river close to my fort, will this system work as a "filter"?
Side View:
~-Water
X-Wall
G-Grate
P-Pump

Code: [Select]

~~~X
~~~X <- Water from river
XX~XXXXXXXXXXXXXXXX
 X~G~PP~~~~~~~~~~~X
 XXXXXXXXXXXXXX~~~X
              X~~~X <- Water Deposit
              X~~~X


[Urist McDwarfFortress]

Im getting water from a river close to my fort, will this system work as a "filter"?
Side View:
~-Water
X-Wall
G-Grate
P-Pump

Code: [Select]

~~~X
~~~X <- Water from river
XX~XXXXXXXXXXXXXXXX
 X~G~PP~~~~~~~~~~~X
 XXXXXXXXXXXXXX~~~X
              X~~~X <- Water Deposit
              X~~~X


Wait, what is the point of that grate? If a building destroyer comes along, its going to bust right through the grate. If you're not facing a building destroyer, then the pump will stop it anyway.

This will stop anything:

Code: [Select]

~~~X
~~~X <- Water from river
XX~XXXXXXXXXXXXXXXX
 X~XGPP~~~~~~~~~~~X
 X~~~XXXXXXXXXX~~~X
 XXXXX        X~~~X <- Water Deposit
              X~~~X
Building destroyers can't break a grate above them.

[Aseaheru]

tis a cutaway.

[krenshala]

Wait, what is the point of that grate? If a building destroyer comes along, its going to bust right through the grate. If you're not facing a building destroyer, then the pump will stop it anyway.

This will stop anything:

Code: [Select]

~~~X
~~~X <- Water from river
XX~XXXXXXXXXXXXXXXX
 X~XGPP~~~~~~~~~~~X
 X~~~XXXXXXXXXX~~~X
 XXXXX        X~~~X <- Water Deposit
              X~~~X
Building destroyers can't break a grate above them.

Also, you don't really need the pump with the above setup since natural pressure through the U bend will allow water flow into the cistern (labeled 'water deposit').  You just need a floodgate where the pump is and a pressure plate set to trigger when water reaches 0 to 4 at your desired depth (I usually put it two z-levels below the top due to the trigger delay between the plate and the floodgate).

That would make it:

Code: [Select]

~~~X
~~~X <- Water from river
XX~XXXXXXXXXXXXXXXX
 X~XG~F~~~~~~~~~~~X
 X~~~XXXXXXXXXX~~~X
 XXXXX        X^~~X <- Water Deposit
              X~~~X
The ^ is a floor with the pressure plate on it. The F is the floodgate tied to that pressure plate.

[Gentlefish]

Or break the pressure at the desired level you want the water with diagonals. You can keep the U-bend, but the cistern will always automatically refill.