350 



Irrigation and Drainage 



where it is dropped in a continuous ridge, because a 

 portion of each plank is cut away at the vertex, thus 

 leaving an opening which passes over the gathered earth. 

 If larger ridges are desired, a wider scraper, with wide 

 opening in the rear, may be followed by one of 

 smaller dimensions, to complete the gathering. 



The mounted road grader may be used to advan- 

 tage in forming such ridges, and it would be an easy 

 matter to construct a special tool for this purpose on 



Fig. 89. Model of flooding by checks. 



the principle of the road grader, but having two 

 scrapers instead of one, mounted in such manner that 

 they could be set closer together or farther apart, as 

 desired. 



After the earth has been gathered into ridges, this 

 may be smoothed down and rounded with a light 

 harrow, followed by a roller, if greater firmness is 

 desired. In Figs. 87, 88 and 89 are different forms 

 of flooding checks, showing how the water may be 

 handled in them. 



