256 



ENGINEERING ON THE FARM 



to the shape of the supply ditch and are known as contour 

 checks (Figs. 212, 213). 



Basin method. The basin method (Fig. 214) of irrigation 

 is limited almost entirely to the cultivation of fruit trees. 



After Irrigation Investigations, U. S. Dept. Agri. 



Fig. 212. First flooding by a contour border check 



After Irrigation Investigations. U. S. Dept. Agri. 



Fig. 213. Contour terracing for irrigation 



