298 



Missouri Agricultural llcport. 



where it enters an opening in the end of the tank and rises in this end 

 to the level of the liquid surface in the tank where it is discharged. 



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Fig. 3. Septic tank with sand filter discliarging on surface of ground. 



SAND FILTER. 



If an underdrain is not practical for removing the waste water 

 from the tank, it will be necessary to let chamber B discharge through 

 a sand filter, as shown in Fig. 3, or replace the opening in the dis- 

 charge end of chamber B by an automatic valve Fig. 4, and conduct 

 the discharge to the system of drain tiles Fig. 5. 



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Fig. 4. Septic tank fitted with automatic valve. 



DISCHARGE IN DRAIN TILE. 



Where the liquids from the tank can be discharged into an under- 

 drainage system. Fig. 2, the tank can be constructed entirely under- 

 ground and sodded over. Where there is not an outlet for an under- 

 drainage system and it is necessary to discharge the li(|uid matter on 

 the surface, it may be done either by constructing a sand filter in 

 connection with the tank as shown in Fig. 3, or discharging into a sys- 



