Waste Water Engineering
The rate of accumulation of sludge in septic tanks is recommended as

30 litres/person/month
25 litres/person/year
25 litres/person/month
30 litres/person/year

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Waste Water Engineering
In septic tanks,

Free board of 0.3 m may be provided
All listed here
The baffles or tees are extended up to top level of scum
The clear space between the baffle top and covering slab is about 7.5 cm

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