AMOUNT OF SEWAGE PER CAPITA 



129 



an area two or three times that necessary for the average 

 flow. 



To show actual examples of hourly and daily variation 

 in the water-supply, the following diagrams are given: 



Fig. 33 shows the variation in the daily water-consumption 

 of the city of Binghamton, N. Y., the details being furnished 

 to the author through the kindness of Mr. John Andersen, 

 secretary of the Water Board. The average daily rate for 



260 rj 



Sunday 



Monday 



Tuesday 



Wednesday 



Thursday 



Chicago 



Apr 



FIG. 35. 



the five days is 220,440 gallons per hour, as shown by the heavy 

 straight line; the average daily maximum (272,400) being 

 24 per cent more than the average daily consumption. 



Fig. 34, from a table given by Rafter and Baker, shows the 

 water-consumption in Rochester from Hemlock Lake. As 

 before, the average rate of consumption is added and the 

 maximum consumption is thus shown to be 46 and 58 per 

 cent more than the average, for the two days shown. 



In Fig. 27, the variation in the water-consumption has 

 already been shown. The maximum rate there is 143 gallons 



