Can The Water Useage Regs Really Be This Difficult To Understand?
Posted 18 April 2016 - 10:34 AM
Does anyone know if it is correct that the water useage calc is simply a total of the appliances? If so, how does any house larger than medium size pass?
Posted 19 April 2016 - 09:44 AM
You also get a credit for rainwater harvesting - we are installing a very basic system (4 1000l IBCs, garden use only) to achieve this, might be an option to get past BR?
Alternatively buy some low flowrate taps if you need to 'downgrade' to pass and then replace.
Posted 19 April 2016 - 09:53 AM
Posted 19 April 2016 - 10:29 AM
Posted 19 April 2016 - 05:54 PM
Question is when & how is this confirmed for BR?
We submitted an initial water calc when we were at the drawings approval stage of inspection (we're using an independent BC), will they check that I installed the exact shower and cistern types? If so, how?
Posted 19 April 2016 - 07:46 PM
Posted 19 April 2016 - 08:19 PM
It doesn't, it averages the shower flow, bath volume, flush volume etc.. and has typical per person usage values hardcoded - It's effectively calculating the use for just one person. I.e. if you have 4 loos and they're all 3.99l per flush (which is what my Gebrit dual flush gives) then it will just take 3.99l as the per flush volume. If you have one 15 and one 25l/s shower then it will average to 20l/s etc..
Your issue is not the number of toilets, its their flow rate - likely the showers are the culprit. Did you have to prove what you installed?
How much are you over? Any scope to fit flow restrictions to the worst culprits?
Posted 20 April 2016 - 01:46 PM
However, their recommendation is to install flow restrictors on showers and sink / kitchen / utility taps to get you back on target. When you're signed off you can remove them.
Your Gebrit dual flush cisterns should already be pretty efficient and water softeners, dishwashers & washing machines are fixed assumptions in the tool (unless you have ultra low usage versions in which case you may be able to claw back some credit).
They said that once they were asked to put flow restrictors on bath taps, which makes no sense as baths are measured by volume, not flow.
Posted 20 April 2016 - 05:16 PM
Posted 20 April 2016 - 05:28 PM
Look at where your bigger figures come out on the right hand column and work on that.
The only real places you can make a difference are taps and showers so concentrate on those first.
If needed, post up what you have and someone may be able to help you
Posted 20 April 2016 - 05:56 PM