366 Irrigation and Drainage 



dykes and wide ditches, and at the same time divided 

 into narrow lands of 30 to 60 feet by parallel nar- 

 rower waterways, which are at once distributaries and 

 drainage ditches, according as water is being applied 

 or removed. These minor distributaries and drainage 

 lines are made necessary chiefly by the necessity of 

 rapid and satisfactory drainage after the ground has 



Fig. 99. Plan for irrigation of cranberries. 



been flooded for protection against insects or frost. 

 The side ditches may be 3 to 5 feet wide and 2 

 to 3 feet deep, according to the size of the area 

 under treatment, while the minor cross -ditches should 

 be 24 to 30 inches wide and 18 to 24 inches deep. 



There are many localities where the land is suit- 

 able for cranberry culture, but where running water 



