Collection of Wastewater 155I I I I I I I- Peak on maximum day
&Maximum 24 hr.
/Average daily discharge for year
/Minimum 24 hr.
rttxtreme minimum on minimum dav
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Average daily discharge of
domestic sewage, MGD.
Figure 8-2. Relation of the average daily flow of domestic wastewater to the extremes
of flow.
W
Figure 8-3. Qpical wastewater collection system layout. (Adapted from 3. Clark,
W. Viessman, and M. Hammer, Water Supply and Sewerage, IEP, New York, 1977.)
a few places, but these are expensive to maintain and are useful only when there are
severe restrictions on water use or when the terrain is such that gravity flow conduits
cannot be efficiently maintained.
A typical system for a residential area is shown in Fig. 8-3. Building connections
are usually made with clay or plastic pipe, 6 in. in diameter, to the collecting sewers