IRRIGATION OF SLOPES. 



45 



which is seen the gate, and at fig. 12 the method of its 

 use. Obviously by shutting the canal in this manner 

 the irrigation is confined to the 

 portion of the field circumscribed 

 by the closed furrow, shown by the 

 dark dotted line, /, /, in fig. 10. 

 The direction of the water is shown 

 by that of the arrow. Where the 

 slope of the ground is too abrupt 



Fig. IL-HA^-GATE. t() admi( . Qf yery j ong furrows&amp;gt; a 



different plan, shown in fig. 13, may be adopted. In 

 this the supply canal, seen at a, I, is the same as previous- 





Fig. 12. MODE OF USING HAND-GATE. 



ly described. From this the lateral canals, c, c, c, are 

 made, each of which supplies its own dependent furrows, 

 and no more water is admitted to these canals than will 



^ a 



Ji p ll c II c I 



Fig. 13. FURKOWS FOB A STEEP SLOPE. 



water the surface to which it is tributary. These canals 

 gradually decrease in size until they disappear at the 



