The high rate of flow of water can lead to increasing sound levels of flow which leads to noise. Hence minimum flow of water should be considered. 0.5-0.7 m/s is maximum velocity of tap water that produces less noise levels. 1.0-2.5 m/s of water flow leads to high noise levels.

The velocity of 3 ft/sec is considered to be minimum to keep foreign particles moving in sewers. The Washington State Department of Health (DOH) recommends a maximum velocity of 8 ft/sec but permits greater velocities during fire flow conditions.

Trench sewer construction is most common pipeline installation method. At grade level, sewers can be installed and protected by an embankment or a wall, or placed inside tunnel walls.

One of sewer wastewater treatment processes is a biological treatment known as activated-sludge process. Wastewater is agitated and aerated to remove solids and oxidation methods are introduced to activate decomposition.

In separate systems, two sets of sewers are used to carry sanitary sewage and storm/ surface water separately. In combined system, a single sewer with a larger size is used to carry both sanitary sewage and surface water toger.

Storm water does not act as a distinctive factor for installation of sewer systems. The type of sewer installed depends upon terrain, where it is placed and uses. Sanitary sewers are most common type of system used to transport wastewater and industrial waste.

Open drains often carry storm water. In rainy seasons water level increases in drains. If it contains clogging or any operations to be done, it becomes difficult if depth is more.

To construct sewer systems certain rules and regulations have to be followed based on quality of pipes chosen, alignment and so on. Pipeline networks are designed by engineers based on city and installed by sewer contractors.

SSMP stands for Sewer System Management Plan. This is a document that any agency uses to manage wastewater collection system effectively. It helps in improving condition of collection system infrastructure.

In separate systems, two sets of sewers are laid. The sanitary sewage is carried through sanitary sewers while storm sewage is carried through storm sewers. The sewage is carried to treatment plant and stormwater is disposed of to river.