138 



IRRIGATION FARMING. 



rably this form of flume may be adapted to a rough 

 country by resting one end of the sills on a precipitous 

 rock wall and supporting the other on timbers, or by 

 means of rods and eye-bolts driven into an overhanging 

 cliff. 



Either galvanized iron, black iron, or asphalted 



FIG. 39 — FLUME WITH OVER- 

 HANGING SUPPORT. 



FIG. 38 — FLUME ON A ROCKY 

 LEDGE. 



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

 used in construc5ling the flume is, 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 



