Waste Water Engineering
The normal values of over flow rates for sedimentation tanks using coagulant, ranges between

50,000 to 60,000 litres/sqm/day
25,000 to 35,000 litres/sqm/day
80,000 to 100,000 litres/sqm/day
40,000 to 50,000 litres/sqm/day

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Waste Water Engineering
In septic tanks,

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
Free board of 0.3 m may be provided

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