SEWER CROSS-SECTIONS 



209 



In order to obtain some comparison between the value of 

 egg-shaped and circular sewers when the flow is small, the 



FIG. 58. 



\ 



FIG. 59. 



author has plotted two sections, reduced in Fig. 59, one of a 

 circular sewer 6 feet in diameter showing depths of flow of 3, 

 6, 12, and 24 inches, and one of an egg-shape, with the same 

 discharges in both cases. The grade was assumed at .03 per 



