Orchard Irrigation 



377 



104. When the stage of surface wetting shown by 

 the dark margins of the furrows has been reached, 

 the water has usually percolated to a depth of three 



Fig. 106. Lower orchard taking water from foot 

 ditch of Fig. 105. 



or more feet, and has at the same time spread later- 

 ally so as to meet beneath the furrows. 



Orchards are frequently arranged as represented in 



