Explain factors affecting Sanitary Sewage.

The quantity of dry weather flow or sanitary sewage is affected by the following factors.

• Rate of water supply
• Population growth
• Type of aria to be served ; and
• infiltration of ground water and ex-filtration of sewage ( addition and subtractions)

Rate of Water Supply:

Since a considerable part (generally 70 to 90 percent) of supplied water emerges as sanitary sewage, the quantity of domestic or sanitary sewage depends on the rate of water supply.

Population Growth:

Since the sewerage project is  designed to serve not only the present population but also for the predicted  future population within the design period also, the quantity of sanitary sewage increase with the increase in population.

Type of area to be served:

The quantity of sewage also depends upon the type of area to be served, which may be industrial or commercial or residential. The quantity of sewage produ....

The quantity of dry weather flow or sanitary sewage is affected by the following factors.

• Rate of water supply
• Population growth
• Type of aria to be served ; and
• infiltration of ground water and ex-filtration of sewage ( addition and subtractions)

Rate of Water Supply:

Since a considerable part (generally 70 to 90 percent) of supplied water emerges as sanitary sewage, the quantity of domestic or sanitary sewage depends on the rate of water supply.

Population Growth:

Since the sewerage project is  designed to serve not only the present population but also for the predicted  future population within the design period also, the quantity of sanitary sewage increase with the increase in population.

Type of area to be served:

The quantity of sewage also depends upon the type of area to be served, which may be industrial or commercial or residential. The quantity of sewage produced by residential area depends upon the rate of water supply whereas the quantity of sewage produced by various industries depends on their industrial processes.

Infiltration and ex-filtration:

Infiltration is the entry of ground water into the sewers through leaking joints while ex-filtration is the leaking sewage from sewer line that percolates into the ground surrounding sewer. The infiltration increases the quantity of sanitary sewage while ex-filtration pollutes the ground water.