DRAINING 



45 



m capacity That is, all the water that can be brought by six 

 one and a half inch pipes will be carried off b}'^ one three inch 

 pipe. Taking the plan, Mg. 9, the first six minors dischaige 

 into a three inch main, the next six into a four inch main or 

 into a second three inch. 



Elaborate tables are prepared, by some writers, to show how 

 many gallons of water will be discharged per minute by dif- 

 ferent sizes of pipe, but they are of no practical value to the 

 farmer, as it is impossible to calculate the amount of water that 

 they will be required to discharge in any given time. 



The following tables give the number of tiles required per 

 acre : 



Table Xo. 1. 



Width be- 

 tween ilrains. 

 Feet. 



20 

 30. 

 40. 



50. 

 60. 



Lcngtb of 

 drains. 

 Roils. 



No. of 13 inch 



tiles per 



;!Cre. 



.132 



2,011. 



88 1,341. 



06 1,006. 



52 805. 



44 671. 



No. of IS inch 



tiles per 



acre. 



...1,452 

 ... 968 

 ... 726 

 ... 581 

 ... 484 



No. of ^>°f 



acres. ^'"'\ 



apart. 



1 20. 



1 30. 



1 42. 



1 45. 



11 21. 



11 30. 



Table No. 2. 



No. of j.^ ^j. No. of No. of 



rods of '^^ feet rods of 



drain. "" apart. drain. 



125 11 42 691 



88 11 45 655 



62 21 21 2,640 



58 21 30 1,848 



1,382 21 42 1,.320 



968 21 45 l,-2.32 



That is, in one acre with drains twenty feet apart, there will 

 be about one hundred and twenty-five rods of drain requiring 

 about two thousand thirteen inch tile. 



