140 



AUSTRALIAN AGRICULTURE. 



between, or allowed to flow into the lower channel (shown by 

 arrow), and so returned to the ditch again. The most effective 

 irrigation is where all the water allowed to pass into the 

 feeder is absorbed or soaked into the soil, without allowing a 



Irrigating by " Stepping " Process. 



run of water at any point. Hilly, broken ground is not so 

 suitable fcr irrigation. The cost and labor of working 

 places of that kind increase rapidly as soon as we get a 

 greater fall than 1 foot in 25. The illustration shows how 

 a very awkward place has been treated. The water 



Irrigating Hilly, Broken Ground. 



brought in at I, which must be the highest part of the 

 land. B B are feeders from the main supply, and the water 

 is then carried along in still smaller channels (c c), follow- 



