Effluent sewer
Effluent sewers also currently serve fewer people than septic systems, which also use septic tanks, but simply dispose of the effluent by draining it into a leach field. About one quarter of United States homes dispose of their wastewater with septic tanks. However, effluent sewers are being looked at as a sewage treatment solution in areas where gravity sewer systems are not well-suited or when the high capital cost to build a gravity system is prohibitive. Areas that are less than ideal for gravity systems include areas that are large, but extremely flat and areas that require long-distance pumping, such as where homes are widely spread out or when several small villages or towns connect their sewage systems so that a centralized plant can be built.
Bettani
The proposed Tank Zam Dam Project is situated across FR Tank at about 30 miles from Tank city, Khyber Pakhtunkhwa. According to rough estimate the Head Tank Zam has 1200 feet bottom and in its South West it has a semi solid hill and on its northern eastern side hills made of mud are located. Flood arriving here from different hilly torrents usually remains out of control and often splash out of its banks and start flowing in different directions and due to this reason its flood water was not fully utilized, he added. In the framed laws of 1965-66, Tank Zam has six Roodhs (Channels), which include Takwara, Siddqi, Chauha, Pir Katch, Lohra and Kiryani from the Northern side. Roodh Siddqi is the major one because large parts of the villages are irrigated with this canal. In present form, almost all the water of this Zam is used for drinking water and is supplied to city. The Bittani tribes residing near Zam also use the water for irrigation of their lands.