The Mjsouitoes of New Jersey 



i8r) 



The type of ditch cut will depend upon the soil, the fall that can 

 be obtained, and the funds available to do the work. Without 

 doubt the best ditch is made of tile or other drainage pipe of ade- 



Fig 122. Drainage of large woo 



B, condition after. 



dland swamp. A, condition before; 



quate size laid well under ground. Some soils are too soft to allow 

 this pipe to remain in place. In some cases the fall which may be 

 had is so slight that covered drains will fill up quickly. In many 

 cases the installation of covered pipes is impracticable from the 



