348 MARKET DAIRYING 
already equipped with power to pump and elevate water, 
there is apparently no reason why the dwelling should 
not be equipped with a water closet. And with a water 
closet in the house there would be practically no expense 
connected with the disposal of the kitchen waste, since 
this would be discharged directly into the soil pipe con- 
nected with the closet. What a convenience such an 
equipment would afford to the housewife and members of 
the family! 
If the dwelling and dairy house are reasonably close 
together, one septic tank will answer for both. In such 
a case the tank is located between the two buildings. 
Where a great distance separates the buildings, a tank 
is provided for each and the outlets are brought together 
as near the tank as possible to save extra expense of tile. 
SUBSURFACE IRRIGATION. 
While the septic tank sufficiently decomposes the 
organic matter to leave the sewage from the tank without 
offensive odors, it is best to run the discharge into a 
system of underground tile where it will serve as a fer- 
tilizer and as an irrigating agent. The tile should be 
laid below the frost line. In loose soils one foot of tile 
per gallon of sewage will answer. Clayey soils require 
two to three times this amount. 
Three-inch agricultural drain tile are best adapted for 
drainage work of this kind, the tile being laid with open 
joints and with a slope of three or four inches per hundred 
feet. 
It is important that this subsurface irrigating system 
be located where there is no seepage into the water supply. 
In places where there is no danger from frost it is best 
to lay the tile only about one and one-half feet below the 
surface. 
