48 



THE PRINCIPLES OF SOIL MANAGEMENT 



curves, which become actually tortuous in very flat 

 bottoms. Such a crooked channel is much reduced 

 in capacity over a straight channel, and therefore in 

 flood season the water is piled up over the bank and 



Fis. 15. Shows the stratified arrangement of a gravelly soil 



overflows the adjacent land. When the water passes 

 from the deep channel, its velocity is checked, and some 

 of the material the coarsest is deposited on the 

 bank. The finer material is carried further out. If there 

 is a general movement over the whole bottom the 

 very finest material may not be deposited, and con- 



