DRAINAGE OF BARN-YARDS, ETC. 



I8l 



inches in diameter and have two rods placed vertically 

 through drilled holes near the entrance to serve as a 

 screen. Both inlet and outlet pipes should be vitrified 

 sewer-pipes to withstand the effects of freezing, which 

 common clay ware will not. A wooden box instead 

 of a brick well will serve the same purpose, but must 



Fig. 34. — Catch-basin for Connecting Surface Drainage with 



Underdrains, 



be renewed when the wood decays, and is obviously 

 less permanent as an improvement. In some respects, 

 however, the wood construction is more desirable. 

 The inlet may then be a hole in the side of the box at 

 the surface flow line, with iron rods fastened vertically 

 across it. 



A serviceable and easily constructed catch-basin may 

 be made of the sections of 24-inch sewer-pipe, which 

 should be set end to end in a vertical position and the 



