106 



IRRIGATION FARMING. 



Either galvanized iron, black iron, or asphalted sheet 

 iron may be used for the trough. All the metal used in 



FIG. 38. FLUME WITH OVER- 

 HANGING SUPJfOKT. 



FIG. 37. 



KLr.MK OX A KOCKY 

 LBDQK. 



constructing the flume i3, or may be if desired, shipped 

 with it, so the erection is very easy. 



Siphons. These are often used to convey a ditch 

 under instead of over a depression in the earth, and may 

 aptly be called an inverted box flume, into which the 

 water flows at the upper end and is discharged at a 

 somewhat lower level on the other side of the ravine or 

 gulch. The same materials as are used in flumes may 

 be employed, and the only extra precaution required is to 

 have them well bolted or provided with braces, that are 



I as tight as possible. Iron bolts or linsps are best. 

 Cast-iron pipes of sufficient diameter, or sheet-steel tubes 

 may be used with favorable results. It should not be 

 forgotten, when deep and wide depressions are to l>o 

 crossed, that the Great Architect of the Universe, in 

 providing that water should rise to its own level, has 



