114 



SEWER DESIGN 



gives the results of the measurements for Manhattan, and is 

 so arranged that the last seven houses only are guilty of excessive 

 and unnecessary water consumption, as determined by careful 

 inspection of the premises. It will be seen that the per capita 

 consumption varied from 29.39 to 88.59 gallons, the latter 

 according to Mr. Croes being neither abnormal nor excessive. 

 In the last seven houses, the leakage and waste was unmis- 

 takable. In No. 20, a leak was found in a flushing- tank, the 

 repairing of which reduced the water used from 82.63 to 38.6 



RECORD OF 25 WATER METERS ON RESIDENCES IN 

 MANHATTAN, NEW YORK 



FlG. 26. 



gallons per capita per day. A similar leak in No. 23 caused 

 a reduction in the use of water from 144.86 to 66.2. In the 

 case of Nos. 24 and 25 water was found to be running con- 

 tinuously through water-closets, and the stoppage of these 

 leaks reduced the flow from 392 and 215 to 73 and 40 gallons 

 respectively. Fig. 26 shows these data, expressed graphically, 

 The heavy line is drawn so that its inclination indicates the aver- 

 age rate of consumption, viz. , 50.84 gallons per head per day. The 

 relative inclination of the other line shows thus at a glance the 

 agreement or non-agreement of the various houses. The effect 

 of stopping the leaks in Nos. 23 and 24 is plainly seen, and that 



