240 EXAMPLES. 



it discharge 100 gallons per minute into the atmosphere, 

 find the total loss of head, assuming the coefficient of fric- 

 tion / = .03. Ans. 10 ft. 2 ins. 



21. Find the loss of head in inches due to a bend in a 

 pipe 2 inches in diameter, the radius of curvature being 6 

 inches, and the velocity of the water being 12 feet per 

 second. Ans. 0.2 of an inch. 



22. If the pipes in Ex. 2, Art. 106, which are to discharge 

 25 cubic feet of water per minute, contain two elbows, each 



of 90, find the total loss of head, 



8 



Here we have, h = (1.505 + 8.748 + 2x0. 984) = etc. 



*ff 



Ans. 1.76 feet. 



23. If the pipe in Ex. 14 contains 5 bends, the radius of 

 curvature of each being 2 inches, find (1) the velocity of the 

 water issuing from the pipe, and (2) the quantity discharged 

 per second. 



Here (3 is found [from (2) of Art. Ill] to be 0.294. . . etc. 



Ans. (1) 5.964 'eet; (2) 224.81 cubic inches. 



24. What quantity of water will be delivered by a canal 

 5800 feet long, when the fall is 3 feet, its depth 5 feet, its 

 lower breadth 4 feet, and its upper breadth 12 feet ? 



Here - = 0.42015. . . etc. 

 a 



Ans. 129.48 cubic feet. 



25. Find the quantity of water that is carried by a stream 

 40 feet wide, whose mean depth is 4 feet, and whose 

 wetted perimeter is 46 feet, when it falls 1 inch in 75 feet. 



Here v approximately, from (4) of Art. 121, = 6.1 feet. .-. / = 

 0.00765, and v more correctly 6.05 feet. . . etc. 



Ans. 1089 cubic feet. 



26. A main 3100 feet long is to discharge water from a 

 reservoir having a head of 75 feet. It is proposed to put in 

 a 6-inch pipe for 800 feet, beginning at the reservoir, then a 



