you only need masses of water to fight fires where buildings are alight
if your home is sitting there ok - but, under cinder attack - you need about a cupful a time (ok, a tad more, but not much)
the whole point 'should' be - that if the structures don't catch fire in the first place - you don't need masses of water
at best - all you need to do is to keep an eye on the cinders - and even then, if what they fall on won't burn ---------- just sit back and look on with interest
I don't think you could build a water supply system to get so much water to an area where you have say - 20 or 50 houses on fire and you want to put them out
I doubt if that's possible - and to have the same system running everywhere
the trick - is to make sure the buildings don't catch fire in the first place -
it isn't that hard ---------- and it isn't that expensive.