AGiilCULTUIlAL EXGIXEERING. 



la 



Table of Size of Tile Pipe of Main Drain. 



(McCoNNELL.) 



Rule for Obtaining Size of Main Pipes. — Multiply the 

 square root of the number of small drains (of fair average 

 length) by the diameter of small pipes; the quotient gives the 

 diameter of main. 



If the distance apart of drains in feet tDe denoted by jF, that 

 in links by L, and the length of drains in chains per acre by C, 

 then 



^ 660 1000 



Number of 12-incli Pipes Required per Acre at 

 Different Distances between the Drains: 



Distance. 

 Feet. 



12 



15 

 18 

 21 

 27 



