201 



The spread and the descent of water are carefully mapped out 

 on these charts. 



The furrows are seven inches deep, and the water was run two 

 days of twelve hours each. Seventy- two hours after irrigation the 

 extent of soil-saturation was measured, the sectional area showing 

 that in clay water had wetted somewhat under sixteen square feet as 

 against about thirty square feet in the case of the lighter, more 

 porous soil. It is contended that a still deeper and narrower water 

 channel in the case of the clay soil would have carried the water 

 deeper, and would have resulted in economy in the use of water, a 

 smaller flow producing as large an area of saturation with less 

 surface. 



Clay Loam, 

 //t Ut. ift 



Sandy Soil. 



m. o m. 



4Jt 



5Jt 



72 HOURS AFTER IRRIGATION 



Percolation experiments, showing spread of water from deep furrows 

 in clay and sandy soils. 



