366 
will be properly taken care of without objectionable odors. Such a stream 
however should have a flow of about 300 cubic feet per minute for each 
1,000 inhabitants. Instances where disposal by dilution alone is sutlicient 
are not many and usually some additional treatment is necessary, suitable 
to local conditions. 
If the stream into which the sewage is to be discharged allows of par- 
tial dilution, treatment by some properly designed form of tank may be 
Sledge blowoff pipe 
Valve 
Septic Tank 
Inletsewer 
Plan 
Chas Brossmann 
Engineer 
Indianapolis 
ae aS EaT Sey Pee 
Section 
Fra. 1. 
Type of Septic Tank Suitable for Ordinary Dwelling. 
suflicient, but tank treatment alone will not always suffice. Tank treat- 
ment is but a step in the purification of sewage and should usually be fol- 
lowed by some form of filtration or after treatment. Various forms of 
tanks can be used but the type and size that insures the best results can 
only be determined after proper investigation of all conditions—as the 
number of people, amount of sewage, the rate and the time of flow, the 
