DRAINAGE OF BARN-YARDS, ETC. 



185 



trees and extend with the slope of the land to an in- 

 tercepting main. (Fig. 36.) These drains should be 

 laid 4 feet deep if possible. It will be found that 

 while the larger part of the roots of fruit-trees are in 

 the first 4 feet of soil, there are roots which extend 

 vertically much deeper than this in search of moisture 

 when it is lacking nearer the surface. No stoppage 

 of drains by roots of fruit-trees has been noted, but it 

 should be observed that this is not the case with trees 



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Fig. 36. — Orchard Drainage. 



like the willow, water-elm, and others which are 

 aquatic or water trees by nature, and whose roots have 

 been known to seek out and clog tiles where growing 

 30 or more feet distant from the drain. Drains which 

 are dry during a large part of the year are rarely found 

 to contain roots of trees of any variety, while those 

 drains which have a constant stream of water run- 



