As part of building control for a new build, I need to submit a water efficiency statement for part G.
I've found the water efficiency calculator, but I'm having trouble finding the flow rates for the taps and shower. The document says I should use manufacturer's figures, but I can't find these online.
Surely any stated flow rate would depend on the pressure anyway? And I don't know the mains water pressure (everything is on mains pressure, with a combi).
Does anyone know if it's acceptable to measure the usage by timing how long to fill a bucket? That would seem to be the best way to get a true figure, but I wonder if the BCO will accept it. Any other tips from anyone who's done one of these calculations before?