Waste Water Engineering
The settlement of a particle in sedimentation tank, is affected by

Viscosity of water
All listed here
Velocity of flow
Size and shape of solid

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Waste Water Engineering
In septic tanks,

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

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