Waste Water Engineering
Drop manholes are the manholes

With depths more than 3.5 m
Without entry ladders
Having drains at different levels
Without manhole covers

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Waste Water Engineering
The stone ware sewers

After casting are dried and burnt at temperature 150°C, 700°C and 1200°C
All listed here
Are manufactured from clays and shale
Are used for carrying sewage and drainage from houses

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