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There are two methods of collection of sewage viz.,
- The dry or conservancy
system
- The water carriage
system
1. THE DRY OR CONVERVENCY SYSTEM: This method is an old method and is practiced
even now in unsewered areas.
It consists in the accumulation of night soil in latrines,
cesspools etc., and its subsequent removal manually and transportation
in vehicles to points of ultimate disposal. The waste water from kitchen,
baths etc., called sullage and the storm water are collected separately
in gutters and let off in to neighboring drainage channels, rivers etc.,
for disposal.
2. THE WATER CARRIAGE
SYSTEM: In this system, the night soil
gets mixed up with sufficient quantity of waste water forming sewage and
is collected in a system of pipes and transported for subsequent
treatment and disposal in a harmless manner without causing any
nuisance. The sewage in
this system flows in accordance with the laws of hydraulics as applied
to flow of water, because the dilution of solid matter in water to form
sewage is normally very great.
The system is universally employed one in practice as it is most
advantageous.
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