IMPROVEMENT OF MUCK SWAMPS. 



163 



effective at A and C than at .B. Also lines showing the surface before and 

 after drainage. Also the clay forming the basin. 



Tile drains ought not to be laid less than three feet deep in muck, and 

 four feet will give much better results. 



SIZE OF TILE. 



The grade that can be obtained for tiles in peat swamps is often very small 

 and for that reason it is better to use an extra large size. You had better 

 not use a size less than three inches, for the reason that imperfect laying or 

 sudden settlement is likely to disturb them less; that is, a certain absolute 

 amount, as one-fourth of an inch, will make less difference with a three-inch 

 tile than with a two-inch. 



The size of tile for main drain can be found quite accurately by rule that 

 acres drained equal twenty-one and one-third times the square root of the 

 product of the fifth power of the radius of the tile in inches multiplied by 

 the rise, divided by the length. , 



A = acres. 



K = radius of tile in inches, 

 h == rise. 

 1^= length. 



Thus the acres drained by a six-inch tile on a grade that rises 1 foot in 250 

 feet would be as follows: — 



A = 21W6'{^i^) = 21iv/ff|= about 21 acres. 



GRADE OF DRAIN". 



There should be no uncertainty about this point ; in most cases it will pay 

 you to have a level run to decide this point. 



Tei,escope. 

 Harris lii Level ^ 



A' very simple level is now sold by C. H. Harris, Jackson, Mich., that any 

 man can learn to use in ten minutes, can do good, accurate work with it. 

 The price, with graduated staff or rod, is $10 without telescope, $20 with 

 telescope. 



