CHAPTER XI 

 AS TO THE WATER THAT CANNOT BE ACCOUNTED FOR 



Even in fully metered systems about 20 per cent of the total water sup- 

 ply is unaccounted for by sale to consumers. F. A. Barbour, Jour. New 

 England W.W. Assn., Vol. XXX, 1916, p. 440. 



There is always a substantial percentage of the water that 

 cannot be accounted for by meters. The table on page 20 is 

 taken from the statistics compiled by the Committee on Water 

 Rates.* 



These records from 29 systems, mainly for the year 1915, 

 after allowing for all the water sold and measured, or other- 

 wise accurately estimated, show an amount that cannot be 

 accounted for of 130 gallons per service daily. 



The water not accounted for averaged 27.0 per cent of the 

 total output. For the several systems, it ranges from 12 to 49 

 per cent. Nine systems, or nearly one-third of the whole num- 

 ber, showed more than 80 per cent accounted for, and 4 systems, 

 or one-seventh of the whole number reporting, showed more 

 than 85 per cent of the water accounted for. 



The amounts not accounted for per service vary from n 

 gallons to 385 gallons daily. For 7 systems, or one-fourth of the 

 number reporting, the water not accounted for was less than 50 

 gallons per service, while for 2 systems less than 40 gallons per 

 service is reported. 



Where the Water is Lost. The water that is not accounted 

 for is made up of various sources of loss. Included among these 

 are the following: 



1 . Leakage from the mains in the streets. 



2. Leakage from the service pipes between the mains and the 

 meters. 



* Jour. N.E.W.W. Assn., Vol. XXX, 1916, p. 454. 

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