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Water main sizing advice please

Hi,
I have recently moved to a farmhouse in central Scotland and the other day our closest neighbour accidentally burst our water main with a JCB. The main is a 1” MDPE pipe running about 500m from the water company roadside main to our farmhouse. This was installed about 20 years ago. The farmhouse is perhaps 5-6m lower than the point it connects to the water company main but our house is on two floors so the upper floor is around 3m above ground level. We have a ground source heat pump with unvented cylinder so we can’t use a shower pump and our water tank is downstairs.

My neighbour, who is a builder and architect has decided to take a branch from my pipe while doing the repair, so that he can feed a house that he is refurbishing. His branch is coming from an equal T piece so is also 1”. He says it should not affect my pressure/flow because you can feed 3 houses from a 1” pipe.

So, my question is, should I be concerned about this or am I worrying about nothing? His branch point is around 80m from the roadside mains supply and my house is around another 500m downstream and like I said 5-6m lower than his house.

Obviously I don’t want to fall out with my neighbour having only just met, but it’s going to be much more awkward if every time someone turns on a tap at his house my supply stops!

Advice most welcome!
Thanks,
Craig.
 

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