38 



VERTICAL FARMING 



Clemson College S. C. Bulletin 



EXPENSIVE TERRACING TO PREVENT EROSION 



Drainage. Attention has already been called to the neces- 

 sity of removing all excesses of free water. Where such 

 excesses are caused, as they so frequently are, by the water 

 being held on or near the surface by hardpan or other imper- 

 vious material below, the trouble may be overcome by breaking 

 through the holding material into more open material below. 

 The full extent of the possibilities of this method of drainage 

 have not yet been developed, and it is quite likely that many of 

 the upland swamps will later be entirely controlled by this 

 method. 



A more rapid development of the larger swamp areas has 

 been retarded on account of the great expense of ditch digging 

 by hand or by the machines suitable for digging under such 

 conditions. Again, a rational use of dynamite has answered 

 the question, for it has been absolutely proven by experimenta- 

 tion and practical application on large and small drainage areas 

 that ditches can be quickly, economically and satisfactorily 

 excavated by blasting. The wet soils of the swamps and over- 

 flowed regions have made digging by hand expensive on account 

 of the difficulties encountered by the labor, but swamp water has 

 no terror for the swift cutting action of a high power dynamite 

 that will rip open a long stretch of large or small ditch at one 

 effort. Such a blast not only opens the ditch, but levels down 



