sewerage design

I. INTRODUCTION The traditional way to dispose waste water is though a cesspit. The solution is to design sewer system or sewage collection system. Three terms in common use in sanitary engineering are sewer, sewage, and sewerage. They require definition. The word sewer, as a noun, refers to a conduit or channel intended to convey sewage; the verb sewer means to supply or equip with sewers; and as an adjective sewer means pertaining to sewer as, for example, a sewer system. Sewage, as a noun, means used water together with such organic and inorganic solids, liquid industrial wastes, ground water, and dry weather runoff as may be mixed with it. Sewage, as an adjective, pertains to sewers or sewerage as, for example, sewage works or sewage association. It is preferable to use the term sewer system rather than sewage system. The word sewage cannot be used correctly as verb. Sewerage, refers to the infrastructure that conveys sewage. It encompasses components such as receiving drains, manholes, pumping stations, storm overflows, and screening chambers of the sanitary sewer. Sewerage ends at the entry to a sewage treatment plant or at the point of discharge into the environment.
There are three types of sewerage systems:
Foul sewers – carry waste water, that is water that has been used for cooking and washing, waste from toilets and from trade premises to our wastewater treatment works;
Surface water, or Storm sewers – carry rainwater from roofs, paved areas, pavements and roads. Surface water sewers generally flow into streams, rivers or watercourses;
Combined sewer – this is a single pipe system which carries both wastewater and surface water to our wastewater treatment works. These are often found in older town centre systems. Single pipe systems are no longer designed or constructed.

The sewage system used in the subdivision is the separate sewer wherein the foul sewer is different from the storm sewer. The design made in this project is

References: http://www.westvalleysan.org/engineering/designstandards/documents/Chapter1.pdf http://en.wikipedia.org/wiki/Sewerage Sewerage and Sewage Treatment -Harold E. Babbitt and E. Robert Baumann http://www.keizer.org/publicworks/DETAILS/CHP_6_DesignStandards-6.pdf http://documents.yvwd.dst.ca.us/engineering/handbook/081212section05.pdf