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[Baffler]

Okay, so I'm trying to fill up a reservoir of water from a source below the reservoir itself. Normally I would just build a pump stack up to the level I want to fill it to, but that isn't an option here because of other infrastructure crowding it out. I have as much space as I need to work with on the bottom level of the reservoir and down. What I'm wondering is, can I pressurize the water in such a way that the water being forced in will fill the reservoir above the level the pump sits on? I tried just setting a pump down but it only filled it up to the same level.

[Magistrum]

Magma piston. With water.
Won't work with aquifers and will run out of water sometime.

Go with pump stacks, they work most of the time.

[Patchy]

Build a pump stack up to the appropriate z-level elsewhere, and have it empty into a tunnel that leads to your cisterns bottom z-level. Just make sure the tunnel has no diagonals and df water-pressure physics should do the rest.

Spoiler (click to show/hide)

Here is a crude side view diagram.
X = Walls
P = Pumpstack
_ = Tunnel
C = Cistern
W = Water Source
F = Your fortress infrastucture thats in the way.

XXXXXXFFFFFFFFFFFF
XXXXXXFFFFFFFFFFFF  <-- Wells can be safely built on this z-lvl
XPP__XFFFFFCCCCFFF
XPPX_XFFFFFCCCCFFF
XPPX_______CCCCXXX
XPPXXXXXXXXXXXXXX
XPPXXXXXXXXXXXXXX
WWWWXXXXXXXXXXX

Basically you have to bring the top of your pumpstack to the same z-lvl that you want to fill in your cistern. Just let me know if you need to me to attempt to clear this up any.

This page on the wiki may help too.
http://dwarffortresswiki.org/index.php/v0.34:Pressure

And a very old forum post, but still good info for your reading pleasure. One that I remember reading and using when I was busy learning how not to flood my forts.
http://www.bay12forums.com/smf/index.php?topic=32453.0

[C27]

If all else fails, bucket brigades are still valid.

[Reelya]

Build a pump stack inside the reservoir, problem fixed.

[Baffler]

Build a pump stack up to the appropriate z-level elsewhere, and have it empty into a tunnel that leads to your cisterns bottom z-level. Just make sure the tunnel has no diagonals and df water-pressure physics should do the rest.

Spoiler (click to show/hide)

Here is a crude side view diagram.
X = Walls
P = Pumpstack
_ = Tunnel
C = Cistern
W = Water Source
F = Your fortress infrastucture thats in the way.

XXXXXXFFFFFFFFFFFF
XXXXXXFFFFFFFFFFFF  <-- Wells can be safely built on this z-lvl
XPP__XFFFFFCCCCFFF
XPPX_XFFFFFCCCCFFF
XPPX_______CCCCXXX
XPPXXXXXXXXXXXXXX
XPPXXXXXXXXXXXXXX
WWWWXXXXXXXXXXX

Basically you have to bring the top of your pumpstack to the same z-lvl that you want to fill in your cistern. Just let me know if you need to me to attempt to clear this up any.

That should work brilliantly! I have the perfect spot for it, too.

Build a pump stack inside the reservoir, problem fixed.

This is also an interesting solution, and it saves me some digging. I'd rather keep the cistern as clear I can manage though.

[Aslandus]

Well if you can take water from another source and fill another column until the pressure equalizes to fill your cistern... then you probably could have just used that source instead... sorry, don't think I can help on this one...

[Dwarf4Explosives]

Build a pump stack inside the reservoir, problem fixed.

This is also an interesting solution, and it saves me some digging. I'd rather keep the cistern as clear I can manage though.

This does have the advantage of your water being cleared of contaminants constantly. So no problem if a dead dwarf or a FB's excretions get into the reservoir.