AMOUNT OF SEWAGE PER CAPITA 109 



any restriction on the unlimited use of water, even though 

 the use of each additional gallon of water means additional 

 expense. The first table (Table XIV), is based on a report by 

 the Municipal Engineering Magazine (Vol. XXXVII, pp. 258, 

 330), with populations from the 1910 Census. Table XV 

 is from a report of Mr. E. C. Bailey, then superintendent of 

 the Albany filter-plant, and represents conditions in 1905. 

 It seems plain from a study of these two tables that there is 

 no relation between the amount of water used and either the 

 size of the city, or its location, but that rather there must 

 be a special inquiry for each city whose water-supply is to be 

 determined. It should also be noted that in many cities, 

 particularly where the water flows by gravity, no method of 

 measuring the flow is provided and the quantity named in the 

 city reports or by the water-works superintendent is little 

 more than a wild guess. If, in addition, the proportion of the 

 population using the municipal supply is uncertain, the per 

 capita consumption may be sadly in error. 



As an example of the method of analyzing the probable 

 amount of water to be provided in a given city, the following 

 extract is made from Appendix II of the report by Dexter 

 Brackett on the Metropolitan Water-supply, Massachusetts 

 State Board of Health: 



" The water used in any city or town may be subdivided 

 under four heads: 



" i. Quantity used for domestic purposes. 



" 2. Quantity used for trade and manufacturing purposes. 



"3. Quantity used for public purposes. 



" 4. Quantity wasted." 



Under the first head should be included not only the amount 

 used for household purposes, but also the quantity required 

 for stores, stables, laundries, and all requirements of a purely 

 residential community. 



The following table (XVI), from the report, shows by 

 actual measurement the per capita consumption for purely 

 domestic use by different classes of people in a number of cities. 



