Waste Water Engineering
In case of sewer lines

All listed here
Test for straightness is carried out with the help of a lamp and mirror
Water test is carried out to check water tightness of the joints
Obstruction test is carried out with the help of smooth ball of diameter 13 mm

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Waste Water Engineering
In septic tanks,

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

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