428 



IRRIGATION PRACTICE 



making. (Fig. 131.) The adjustable crowder, as shown in 

 Fig. 132, is extensively used in removing the loose dirt 



LAR6EL COLLAR 



FIG. 137. Distributor for hose. 



from the plow furrow. If the ditch is large, the scraper is 

 used for that purpose. 



Farm ditches must be constructed with reference to 

 the quantity of water 

 required by the land 

 that they are to serve. 

 The quantity of water 

 that may be carried 

 by a ditch depends 

 fully as much upon 

 its fall or grade as 

 upon its width and depth. The smaller the volume 

 B carried by a ditch, the greater the grade 

 required to secure the same velocity 

 of flow. In a small ditch capable 

 of carrying about \y% second- 

 feet of water, a fall of 2 

 inches to the rod 



FIG. 138. Attaching hose to distributor. 



FIG. 139. Leveling device. 



