be drawn into an adjacent sludge drying bed. If gravity flow is not
possible, the sludge nay bo pumped out.
DRAINAGE FIELD: Whore only a small area is available for a drainage,
a distribution box as shown may be provided. Through adjustment of
gate valves, the effluent is made to flow first on one part of the .
field and then another, providing "rest" periods-.
GROUND ABSORPTION: To absorb the efficient from the tank, a field of
drain pipe is laid with open joints, and at a grade of 1 inch in
100 feet, or practically flat to prevent too rapid flow; A minimum
of 20 lineal feet of tile per person should be provided, even in
sandy soils which arc highly absorbent, while for ti0hter soils,
greater lengths should, be provided per capita served. The top of the
open joints should be covered with tar paper to prevent dirt and
other material from 3iftin0 into the pipe.
To provide greater absorption, dig the ditch for the drain tile deep
er, refill with cinders, and sand gravel, A minimum of 1 lineal
foot per person should be provided.
GREASE TRAPS: Grease traps may be installed to prevent ferer.se from
kitchen and bath from entering the tank. If grease trap is installed,
a convenient opening for cleaning should be provided*
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