=150. Analysis of Reasonable Daily Supply per Head of Population.=—It has repeatedly been found that the losses or wastes set forth in the preceding statements amount apparently to quantities varying from 30 to 50 per cent of the total supply; or, to put it a little differently, the water unaccounted for in even the best systems now constructed apparently may reach one third to one half of the total supply. This is an exceedingly wasteful and unbusinesslike showing. It is probable that the statement is, to some extent at least, an exaggeration. It is practically certain that either the amount supplied or the amounts consumed, or both, are never measured with the greatest accuracy, and that the errors are such as generally swell the apparent quantity wasted. After making judicious use of the data thus afforded by experience, it is probable that the following tabular statement given by Messrs. Turneaure and Russell represents limits within which should be found the daily average supply of water in a well-constructed and well-administered system. +---------------------------+--------------------------------+ | | Gallons per Head per Day. | | Use. +----------+----------+----------+ | | Minimum. | Average. | Maximum. | +---------------------------+----------+----------+----------+ | Domestic | 15 | 25 | 40 | | Industrial and commercial | 5 | 20 | 35 | | Public | 3 | 5 | 10 | | Waste | 15 | 25 | 30 | +---------------------------+----------+----------+----------+ | Total | 38 | 75 | 115 | +---------------------------+----------+----------+----------+ The values given in the preceding table are reasonable and sufficient to supply the legitimate needs of any community, but, as will be shown in the succeeding table, there are cities in this country whose average consumption is more than twice the maximum rate given above. =151. Actual Daily Consumption in Cities of the United States.=—The following table exhibits the average daily consumption of water throughout the entire year for the cities given, as determined for the years indicated in the table.