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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
These two books are the perfect starting place to help you get to grips with one of the most vitally important aspects of our society - our homes and living environment.

PLEASE NOTE: A download link for Volume 1 will be sent to you by email and Volume 2 will be sent to you by post as a book.

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    • CommentAuthorRex
    • CommentTimeAug 16th 2026
     
    What ho one and all,

    The headline on the front of today's Telegraph is what can only be described as 'surge pricing' for water during droughts. The aim is to encourage us to use less water.

    This really anger me as we have a 6k liter rainwater collection tank and apart fro the fact that I'm not paying for incoming and by default, sewerage charges for using that water, I am unlikely to get any consideration for the fact that I am using less treated water than most houses.

    With all the building regs we have in place, surely it makes sense that every new build, whether single houses or estates, must have a large rainwater collection to be used for toilet flushing. After all, every new build has to have a large soak-away, so why not collect that water before it goes to the soak-away?

    It is absolute madness to flush expensively treated, potable water down the lavatory.

    Now I'm off my soapbox!!
    • CommentAuthorphiledge
    • CommentTimeAug 16th 2026
     
    The "consideration" you'll get is lower bills? Save your rain water til drought pricing kicks in and use it then.

    Much like a household battery charged when eleccy is abundant and cheap, then used when the price is higher. Think yourself lucky that you built your water battery when you did:)
  1.  
    A surprising number of properties don't have water meters, and very few of the ones that do are 'smart meters' that could differentiate pricing water during one time from another.

    The UK really does need to get everyone onto smart water meters, but given all the hissy fits about fitting smart energy meters, expect that to take a long time!
    •  
      CommentAuthordjh
    • CommentTimeAug 17th 2026
     
    I had thoughts of using rainwater to flush toilets when we built, but in the end didn't bother because of the extra complication and rules around the plumbing needed. Plus my wife's natural conservatism about such things.

    If you use rainwater for flushing then I think you already get a discount on your sewerage charges, since the outflows are not metered but a fraction of the incoming is used as a proxy.

    I don't think smart meters are particularly necessary for drought pricing, but in any case the regime for installing them is completely different, in that the utility just installs them regardless of the property owners' wishes or tariff. They're used to improve leak detection, both at the property and in the distribution system.
  2.  
    Drought pricing is the same as ToU electricity pricing (Economy 7 or whatever)

    The utility company needs to know how much I used during the scarcity period, and how much I used in the rest of the period, so it can bill me at different rates. This needs to be measured in a tamper- and fraud-resistant way that is difficult for me to dispute later. A standard meter can't tell them that, it doesn't differentiate which day I used each litre.

    They could guess that my drought consumption pattern was the same as everyone else's, but that's an easy system for me to game, unless they physically come round and read everyone's meter on the declared first and last day of each drought.



    An easier system would be where the first 100 litres per person per day is at cheap rate and anything over that is at higher rate. That's enough for a shower and flushing the loo, but if someone is watering their plants then they will pay more.

    The difficulty is for the water company to establish how many people live at each address - eg I have a son at university during term time, can I claim his cheap water allowance whilst he is away and water the veg plot?



    Looking at the figures, it does seem that UK average water consumption 140 litres/day is heavily skewed by a minority of households who use drinkable water to water gardens or wash cars. One approach would be to give discounted water bills to people living in flats. People in houses with gardens and car parking could perhaps claim the same discount if they remove all outside taps that are fed from mains water? Or if they agree to fit a water meter.

    That's a politically difficult demographic to upset though, lots of Telegraph readers have nice gardens and shiny cars!
    • CommentAuthorMike1
    • CommentTimeAug 17th 2026 edited
     
    Posted By: WillInAberdeenThe utility company needs to know how much I used during the scarcity period, and how much I used in the rest of the period, so it can bill me at different rates. This needs to be measured in a tamper- and fraud-resistant way that is difficult for me to dispute later. A standard meter can't tell them that, it doesn't differentiate which day I used each litre.

    Here in France many of us have smart water meters (5 million now, 10 million expected by 2030), so many providers know exactly how much everyone uses every day.

    Posted By: WillInAberdeenAn easier system would be where the first 100 litres per person per day is at cheap rate and anything over that is at higher rate. That's enough for a shower and flushing the loo, but if someone is watering their plants then they will pay more.

    I know that some areas here bill in a similar-ish way - per household, in two or more usage bands on a monthly basis. It's possible that some do it by the day, because every area can determine their own billing methods.
    Unlike the UK, most water & sewerage infrastructure is still owned by the local authority / town council, so there may be thousands of billing variations (private companies are involved, but normally only by holding fixed-term management contracts).

    Some areas also give discounts to low-income households or those with over a certain number of children.

    Posted By: djhThey're used to improve leak detection, both at the property and in the distribution system.

    Yes, here in areas with meters they compare how much is pumped into the network and how much is used, so they calculate exactly how much is leaking. Some - maybe all - also send alerts to people who suddenly have an abnormally high usage, which could indicate a leak.
  3.  
    Last year, to my surprise, we were contacted by Severn Trent to say that we had a leak. They had picked it up from the meter (that they read remotely by driving past it slowly - it's in the field in front of our house)
    It was only a small leak on an above-ground part of a supply to an outbuilding, cold weather had affected a joint.
    I was impressed that they had picked up on it. In my opinion, the system works!
    •  
      CommentAuthordjh
    • CommentTimeAug 17th 2026
     
    Yes, they can detect leaks both by the overall volume used, and by noting whether the usage rate drops close to zero for a period (usually during the overnight period). I imagine they can detect hosepipe users in the drought by noticing periods of continuous usage.
  4.  
    Its not in the interest of water companies for us to use less water. There was a guy who invented a water saver device for toilets (interflush)and showed it on dragons den they said it had no business model.
  5.  
    Mmm not sure about that. My water company sent me a free water butt and even paid delivery, pretty sure they wouldn't have done that if they were trying to bump up my consumption.

    Water companies are not like supermarkets that make money from selling more water. Instead they get paid a %age interest rate on the capital value of their assets. The % rate is pushed up or down by Ofwat depending on a bunch of performance measures, including how good they are at reducing water consumption.


    Everyone's water bills are added up and used to pay the water company's interest %. If we all used more water this year then there will be more money collected, the extra will be knocked off next year's % interest, but the water company will still have the cost of supplying the extra water. So they'd prefer we all used less as that saves them money.


    This all applies to England as water is non-profit in Scotland Wales and NI.
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