1. The effluent of a septic tank is
2. 5 days-biochemical oxygen demand (BOD5) is taken at a temperature of
3. The bottom of the sewage inlet chamber of septic tanks, is provided an outward slope
4. Drop manholes are the manholes
5. For laying a sewer line in a trench of 2 m width, an offset line is marked on the ground parallel to the given centre line at a distance of
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