Methods of Collection of Sewage Water
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.