That totally depends on how many houses there are, and what the pressure in the water mains is.
The smallest allowed where I work is an 8" diameter water main, but 10" and 12" are common, too.
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Kilograms is the usual unit in this case.Kilograms is the usual unit in this case.Kilograms is the usual unit in this case.Kilograms is the usual unit in this case.
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