Thsts 



13S» 



such cases the increase in friction loss will be less than 12^ per cent 

 for each riser in 100 feet. 



The horizontal lines which occur in Table XX indicate the mini- 

 mum grades allowable for each size of pipe in cases where the water 

 carries much sediment. For example, a l2-inch pipe line must have 

 a fall of at least 0.4 foot per hundred feet in order to prevent the 

 deposition of sand in the pi])e. In case the water is clear or can 

 be passed through a settling basin before entering the pipe, the 

 flatter grades can be used, or perhaps the line can be flushed out 

 occasionally through cleanouts. 



The capacities are stated in cubic feet per second, but the quan- 

 tities can be reduced to Arizona miner's inches by multiplying by 

 forty. 



T.\BLK XX. C.MWCITIKS OF V.VRIOUS SIZES OF CFMKNT PIPE RUNNING FULL 



Orade 

 Per 

 100 ft. 



Feet 

 1.0 



.6 



.4 



2 



.1 



.05 



