Waste Water Engineering
Drop manholes at the junctions of sewer lines, are provided if

Two sewer lines intersect
Sewer line runs along a main road
Invert level of a branch sewer is more than 60 cm that of the main sewer
Ordinary manhole cannot be built

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Waste Water Engineering
In septic tanks,

All listed here
Free board of 0.3 m may be provided
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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