I want an analysis of daily water usage that breaks out the data by family type and size in the United States. (Although I am happy to get usage data by demographics for any part of the world if that is all that is available!)
For instance, the sort of thing I would like to know is water usage for a married couple in their 40's with no kids versus, say, elderly couples and singles. I would also like to know about differences in usage between professional couples (i.e. not home a lot) versus couples and families that spend most nights at home. Some of this I can adjust mathematically, but there are no baseline numbers, other than overly broad averages, that I can find.
What I generally find are averages that either state daily usage for an archetypical "family of four" or others that appear to use that sort of data to start and give a single "average use for one person" number. These numbers are overly influenced by default families that do not make up any portion of the population I am analyzing. I believe that family type and size will affect usage significantly.
A chart or (U.S.) EPA report or something with some connection between water usage and demographic composition of a (housing) community would be ideal. (Just to be clear, when I say community I mean a small clump of homes or condominiums, not cities or towns.) It is really important for the case that is being made here that the information be neutral, that is, not data provided by companies trying to sell water savings products and the like.