170 



AGRICULTUKE. 



AREAS FR03I WHICH 14 INCH OF WATER WIEE BE 

 REMOVED IN 24 HOURS BY Ol TEET TILE DRAINS OF 

 DIFFERENT DIAMETERS AND LENGTHS WITH DIF- 

 FERENT GRADES. (Elliott.) 



Diam- 

 eter of 

 Tile in 

 Inches. 



5 

 6 



7 



8 



9 



lo 



I 2 



14 

 i6 

 i8 



20 



Grade per loo ft. in Decimals of a Foot (with Approx. Equiv. 

 in Inches). 



16. 

 26. 

 38. 



53- 

 72. 

 94- 



147. 



217 . 



.502 . 



405. 



526, 



2G. 6 



32.5 



47-7 

 66.5 



89. I 

 oiii5.6 

 9 181. 7 



4 265.8 



5 369.5 

 5,494-4 

 7,640.4 



19.4 

 30.5 



44.8 

 62.6 

 83.8 



108.9 

 171 .6 

 251.7 

 350.4 

 470.1 

 610.5 



Diam- 

 eter of 

 Tile in 

 Inches. 



5 

 6 



7 

 8 



9 



10 

 12 



14 

 16 

 18 



20 



Grade per 100 ft. in Decimals of a Fo )t (with Approx. Equiv. 

 in Inches). 



23. 



37. 



54. 



75. 



lOI , 



131 • 

 206, 

 302. 

 420. 

 562. 

 729. 



30.3 



47-8 



70. I 



98.0 



131 -3 



'70.5 



208.6 



393-9 



548.8 

 735. I 

 s;54.6 



Three feet of soil above the top of the drain has been assumed. 

 The grade, length of drain, and openness of soil are important factors 

 in the capacity of a tile drain for discharging soil-water. 



