DRAINAGE 



171 



Figure 

 on which 



73. Map showing the drainage of 480 acres of land in Iroquois county. 111., 

 69,700 feet of drain tile were laid 3 and 4 feet deep. Elliott. 



cylinder. Only that water which falls immediately over 

 the drain, as a rule, percolates down through from the 

 upper side. Water from rain percolates directly down- 



