In "The new darkroom handbook" (Focal press) you will find just what
you are looking for.

Gilbert

Great ideas here http://www.bonavolta.ch/hobby/en/photo/waterpanel.htm

Guillermo

Here's a snapshot (116 KB) of my basement sink and water panel.  Is this the
type of picture(s) you had in mind?  (Sorry for the hotspot on the left.
This was made months ago for a completely different purpose with my wife's
P&S and not a great deal of advance planning.)

  http://home1.gte.net/kjnadvor/darkroom/WetSide2.jpg

Hot and cold supply lines enter from the wall between the filters.  Each
line first passes upward through its own shut off valve to allow for filter
cartridge changes and other maintenance.  All of the fixtures (filters,
regulator, etc.) are back-threaded through the panel and isolated with union
joints so they can be unscrewed and removed directly from the front side
without removing the panel itself.

I routinely shut off the supply lines and bleed the pressure from the pipes
when not using the darkroom.  (I'm hoping this will lengthen the lifespan of
my water temperature regulation unit.)

The hot line filter (orange) is left, cold line is right.  The supply lines
are then split, allowing for the filtered, but otherwise unregulated, mixing
faucet on the left side of the sink.  I find a manually regulated outlet
very handy for equipment washing and sink rinsing.

Automatic temperature regulation is handled by a Hass Intellifaucet K250
(the square black unit below the valves) which is fed by the other side of
the split supply lines.  This unit has a single tempered water outlet.  I
split this outlet into two separate outlet lines.

The first tempered outlet line drops directly down to the second faucet from
the left.  This faucet is double-filtered like the left-hand one, but adds
the attributes of temperature regulation, flow regulation and settable flow
timing, courtesy of the Hass unit.

The second tempered outlet split leads to the third faucet (on the right).
This faucet is shown connected (through an anti-siphon check valve) to a
16x20 Versalab print washer (hiding under the towel on the far right).  This
third faucet adds one more additional attribute of water control.  It passes
through a water volume flow meter gauge (the upright clear acrylic thingy
above the faucet itself).  This gives me a reliable measure of
gallons-per-minutes for the print washer.

In addition, the Versalab washer sits in its own custom-made epoxy overflow
catch basin (hidden by the sink stand and counter in the foreground) that is
designed to be just larger than the washer's outside dimensions.  This is
intended to be a last line of defense if something should go terribly wrong
while prints are slow-washing after I go to bed, as it will allow the washer
to completely overflow without submerging my basement.

You may also notice that the entire lengths of both split tempered outlet
lines are covered with black foam pipe insulation.  This works to keep the
post-regulated water at its correct temperature until it reaches the
regulated faucets.  Also, all controls and gauges have been located at my
personal eye-level for ease of use.  Since the flow meter requires input
from below, this choice made for a somewhat convoluted piping layout for the
third faucet.  Everything does, however, work perfectly.

As a non-professional hobbyist, this arrangement has worked well for me for
over a year now.  I sweated all the copper piping myself without a great
deal of experience and it turned out fine.  I even spray-coated the pipes
with a polyurethane overcoat just for aesthetic purposes to keep the new
copper pipes untarnished and shiny over time.

Hope this helps with some additional ideas.  I would be happy to make and
post a few close-up photos (without hot spots!), if you feel that might
help.  Just let me know.

Ken

There is a nice book about darkroom building:
The New Darkroom Handbook (A complete Guide to the Best Design,
Construction, and Equipment) by Joe DeMaio, Robin Worth and Dennis Curtin at
Focal Press (ISBN 0-240-80260-8)
The sections about plumbing and electricity are impressive ...

Or, my first experience in plumbing is here:
http://www.bonavolta.ch/hobby/en/photo/waterpanel.htm
You probably should put the electrical plugs higher than what I did ...

Good construction,

Ok, here are 4 views of my sinks.  I hope they will explain the drawing I
did earlier.

http://alexisneel.com/sink1.jpg
http://alexisneel.com/sink2.jpg
http://alexisneel.com/sink3.jpg
http://alexisneel.com/sink4.jpg

Number 1 shows how the water comes in from the main line (small room,
sink 12')
Number 2 is the film room and shows the filter system, with on/off valves
on either side of them.
Number 3 shows basically the same as #1 but in the larger room (sink is
15') with work station on the left.
Number 4 shows the toning area, with a mixed line to each washer, various
mixed cold and hot outlets and one cold.  Prints were on screens beneath
that would slide out individually.  Fan and quartz heater on one side if
needed to dry quickly.

Hope this helps.

Alexis