132 SMALL WATER SUPPLIES. 



forced by expanded metal. It may here be re- 

 marked that it is impossible to go into detail 

 over the amount of reinforcement required. The 

 reader is referred to the author's work on " Civil 

 Engineering Practice " (C. Griffin), and to other 

 standard works on the subject. But the best results 

 are usually obtained when preliminary designs are 

 got out by sending such drawings to the companies 

 who make the reinforcement. They will always 

 advise the most economical sections to use. 



The exposed walls want buttresses and reinforce- 

 ment For the case in question, the buttresses would 



F C Pipe. 



FIG. 94. FIG. 95. 



be well placed at 7 ft. centres, and the wall would be 

 reinforced with \ round rods horizontally, as shown, 

 the vertical ones being placed i ft. centre to centre. 

 The rods are bound together by wire. Expanded 

 metal is shown in its correct position. Regarding 

 the buttresses, the best reinforcement would be two 

 i-in. round rods, and one f-in. rod with stirrups of f- 

 in. hoop iron, as shown. The bottom is reinforced 

 with expanded metal. The coping should be rein- 

 forced with f-in. horizontal round bars bound with 

 wire to the vertical ones. The erection of such work, 

 of course, demands the usual skill and attention be- 

 stowed on engineering construction work. A detail 

 drawing is given in fig 96. 



