TILE DRAINAGE 



101 



.MAP OF " SPECIAL PROBLEM " ON 3<> ACRES. 



Fig. 27. Thorough drainage of 36 acres (besides fence-rows and head- 

 hinds), situated on the farm of W. I. Chamberlain. The curved and 

 crooked dotted lines are lines of equal elevation above the outlet, 

 14 contour lines." They are marked 5, 10, 15, etc.; that is, the number 

 of feet of rise or elevation above the outlet. The single straight lines 

 are 2-inch lateral drains; the double lines are main drains, A is an ice 

 and fish pond, and B a pond for watering stock. C is a "catch pond" 

 (usually dry) in which is the "catch-water" or "catch-basin" to take 

 the pond-water in f ivshets into the 6-inch main. 



