THE TILE DRAIN. 



139 



Fig. 9. 



Fig. 10. 



431. The tile drain is not only more economical, but it 

 carries off the water better and lasts longer. If the stones 

 were picked up and placed at the edge of the trench 

 without any expense, the drain made of them would be 

 less economical in the end than one made of tiles which 

 cost |10 or $12 per thousand. 



432. The pipe tile, (Fig. ll a ,) a simple round 

 tube, is found to be the best in shape. For 

 the interior drains which enter into the larger 

 main drains, a tube of two inches in diameter 

 is about the right size. 



433. The fall should not be less than one inch to the 

 rod. A drain properly laid in this way may be expected to 

 last and answer a good purpose for half a century. 



434. The sole tiles made in this country, shown in figure 

 II 6 , are not so good because they must necessarily be laid 

 sole down, and if they happen to be warped in burning, 

 as they often are, it is difficult to get a perfectly straight 

 and reliable water course. 



435. The brush drain is sometimes made by digging a 



13 



Fig. 11. 



