THE DRAINAGE OF FARMS. 



91 



TRANSVERSE SECTION OF DRAINS, &C 



Sto 



Double, Tilf large Tile Inverted Conpl 



submains should be at least six inches lower than the parallel 

 drains, so as to secure a sufficient fall. In speaking of the incli 

 nation of the drain, so as to secure a sufficient fall for carrying 

 off the water, I have given the minimum which should be relied 

 on. Mr. Morton is of opinion &quot; that 1 in 200 is the least that can 

 be advised ; 1 in 140, or 1 in 100, would keep the bottom clear 

 of sediment.&quot; The width of the parallel drains at top should be 

 fifteen inches ; at bottom, it may be from four to five inches, ac 

 cording to the width of the tile with which they are to be filled, or 

 the quantity of stones which may be at hand to fill in with ; but 



