High water consumption

[Rach.l]

My building is using 3 times the amount of water it should.
I have had the water meter changed.
I have checked every riser for leaks.
Plant is not losing water all overflow pipes visible.
Had every meter checked for other flats and businesses within our block. No one stealing our water.
No leak visible within the building or outside, it's been going on for over a year now.
All outlets are secure not letting by water.
13,000 Lts a day must be going somewhere?
Thought I would ask if anyone could think of anything or come up with any ideas?
I'm now at a loss of what to try next.
Thanks

 

[snowhead]

For a building of that size I would have thought the meter would have a pulse output.
This can be monitored constantly and show when most usage occurs.

eg ; Crucible Technologies - Home

Failing that,

Check the meter every hour through a 24hr period.

Plus,
Does each riser have it's own isolation valve?

If so, someone watch the meter, someone turn off each riser 1 at a time.
The flow through the meter will disappear when the guilty riser is found.
It won't affect the users if you turn the riser off and then straight back on.
Maybe do it early, before 10 am before the students get up !!

Then track down users on the guilty riser.
If it's spread over all risers, you must have normal consumption and the other building has extremely low consumption.

PS beaten to some of it by Chalked

 

[Joncpi]

Is it possible there is a irrigation system you are not aware of? Or more simply an outside tap perhaps fed underground?
Is there a fire extinguisher system?
If possible isolate each riser to find the one using this water. If no isolation valves, fit some. Then isolate in turn in order to narrow down your search.
I have had an overflow pipe leaking into the cavity, impossible to detect until I checked every single overflow visually.
Is there a pipe running in a cavity somewhere? I know there shouldn't be but I am never suprised by builders!