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Donald,
The
percentage of potable water actually used for drinking and food prep is very
small. Maybe 1 to 2 gal/day/person at most. Sanitary use is likely
to be 10 to 15 gal/day/person. This is a typical rate for office workers
where there would be limited use for toilets, hand washing, etc. A
household can use up to 50 gal/day/person. The large increase in water use
is attributed to bathing and clothes washing. Lawn watering and water
makeup to a pool will add to this, but the amounts are seasonal and very site
specific. Conservation measures would reduce all of these
amounts.
As for
reference sources, any good book on HVAC design should provide general
guidelines as to water consumption on a per capita basis. These
compilations of "rules of thumb" are often used for the initial sizing of
utility systems when not much else is known about a project. Water
agencies should be able to provide you with an estimate of water use
distribution for their service area. Hope this helps.
Mike Callahan, PE
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