174 SEWER DESIGN 



advise in their formula a value of 140 for new cast-iron pipe, 

 of 100 for old cast-iron pipe, no for vitrified pipe and 100 for 

 brick conduits. 



PROBLEMS 



67. With the aid of Table XXII (first assuming a value of C and 

 deriving v in order to select a proper C from the table) determine values 

 for v when d = 6 inches and $ = .5 per cent and for d=$6 inches and s = .i 

 per cent. 



58. If Latham's book on Sanitary Engineering is available, look up 

 values in those tables for comparison with results of Problem 57. 



59. Compute, using Table XXII, the value of v when ^=48 inches and 

 s = 6 inches in 100 feet. Compare result with tables in Moore's " Sani- 

 tary Engineering." 



60. Determine the value of C from Bazin's formula, using the con- 

 stants for brick and assuming that D = i2 inches. Compare with the 

 constant obtained for Table XXII. 



61. In the Williams-Hazen formula, take C = no, =30 inches and the 

 fall of the water surface 7.98 feet in 4160. What is the velocity of flow 

 and what the discharge with the pipe half-full? 



62. In the Sullivan formula, take C = 125, D = 2.5 feet and the hydraulic 

 grade, 11.85 f eet m 6170. What is the velocity of flow and what the dis- 

 charge, if the pipe flows full? 



63. Determine the values v and Q, by the Santo Crimp formula if 

 the slope and diameter are respectively .00192 and 30 inches. 



64. Determine the values of v and Q in the Robinson formula if C = .004, 

 w 5=1,74 and # = .67, the other data being identical with Problem 62. 



