... ![diagram][1] [1]: https://i.imgur.com/KIEJe5A.jpg - The manhole in which a vertical pipe is used is called a drop manhole , where as the one using an inclined pipe is called a ramp. - The construction of a drop manhole in place of an ordinary manhole in case a high level branch sewer enters a ...

... **Conservancy system**: Advantages: 1) initial cost is low 2) no need of water of flushing 3) no need for construction of sewer pipe Disadvantages: a) a unhygienic way for disposing waste b) A labour is daily needed to collect waste c) cannot be adopted for buildings. **water carriage syste ...

... **A)Physical constituents**:- **Turbidity**:-sewage is normally turbid,resembling dirty dish water and waste water from baths having material like piece of paper , cigarette ends, match stick, soaps, fruit skins,etc **Colour**:It can be detected with naked eye it indicates freshness. If colour is ...

... A)The sewers are used to convey the sewage and also the storm water. The material used to construct the sewer is determined by the following factor 1) cost 2)the imperviourshers 3)the durability 4) non corrosiveness 5) the strength 6)the weight After considering the above points the material ...

... **Self cleaning velocity**: When there is no solids get deposited in the invert of the sewer of minimum velocity , then minimum velocity is termed as self cleaning velocity **Size of sewers**: 1. The minimum size of public sewer should not be less than 0.15m. But in actual practice it is recomm ...